WWW.MOTOROLA.COM/SEMICONDUCTORS
HCS08
Microcontrollers
MC9S08GB60/D
Rev. 1, 6/2003
MC9S08GB60
MC9S08GB32
Data Sheet
MC9S08GT60
MC9S08GT32
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including without limitation consequential or incidental damages. “Typical” parameters which may be provided in Motorola data sheets and/or specifications can and do vary in
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DOCUMENT NUMBER
MC9S08GB60/D
©Motorola, Inc., 2003
MOTOROLA 3MC9S08GB/GT
MC9S08GB/GT
Data Sheet
V1.0
8-/16-Bit Products Division
Motorola, Inc.
MC9S08GB/GT4 MOTOROLA
Revision History
This product incorporates SuperFlash technology licensed from SST.
Revision
Number Revision
Date Description of Changes
1.0 4/25/2003 Initial release
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 5MC9S08GB/GT
List of Sections
Section 1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Section 2 Pins and Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Section 3 Modes of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Section 4 Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
Section 5 Resets, Interrupts, and System Configuration . . . . . . . . . . . . . . .63
Section 6 Internal Clock Generator (ICG) Module . . . . . . . . . . . . . . . . . . . . .81
Section 7 Central Processor Unit (CPU) . . . . . . . . . . . . . . . . . . . . . . . . . . . .109
Section 8 Parallel Input/Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .129
Section 9 Keyboard Interrupt (KBI) Module . . . . . . . . . . . . . . . . . . . . . . . . .149
Section 10 Timer/PWM (TPM) Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .155
Section 11 Serial Communications Interface (SCI) Module. . . . . . . . . . . . .171
Section 12 Serial Peripheral Interface (SPI) Module . . . . . . . . . . . . . . . . . .191
Section 13 Inter-Integrated Circuit (IIC) Module . . . . . . . . . . . . . . . . . . . . . .207
Section 14 Analog-to-Digital Converter (ATD) Module . . . . . . . . . . . . . . . .221
Section 15 Development Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .237
Appendix A Electrical Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .261
Appendix B Ordering Information and Mechanical Drawings. . . . . . . . . . .281
List of Sections
MC9S08GB/GT6 MOTOROLA
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 7MC9S08GB/GT
Table of Contents
Section 1 Introduction
1.1 Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
1.2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
1.2.1 Standard Features of the HCS08 Family. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
1.2.2 Features of MC9S08GB/GT Series of MCUs. . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
1.2.3 Devices in the MC9S08GB/GT Series. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
1.3 MCU Block Diagrams. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
1.4 System Clock Distribution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Section 2 Pins and Connections
2.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
2.2 Device Pin Assignment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
2.3 Recommended System Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
2.3.1 Power. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
2.3.2 Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
2.3.3 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
2.3.4 Background/Mode Select (PTG0/BKGD/MS). . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
2.3.5 General-Purpose I/O and Peripheral Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
2.3.6 Signal Properties Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Section 3 Modes of Operation
3.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
3.2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
3.3 Run Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
3.4 Active Background Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
3.5 Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
3.6 Stop Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
3.6.1 Stop1 Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
3.6.2 Stop2 Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
3.6.3 Stop3 Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
3.6.4 Active BDM Enabled in Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
3.6.5 LVD Enabled in Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
3.6.6 On-Chip Peripheral Modules in Stop Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Table of Contents
MC9S08GB/GT8 MOTOROLA
Section 4 Memory
4.1 MC9S08GB/GT Memory Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
4.1.1 Reset and Interrupt Vector Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
4.2 Register Addresses and Bit Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
4.3 RAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
4.4 FLASH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
4.4.1 Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
4.4.2 Program and Erase Times. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
4.4.3 Program and Erase Command Execution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
4.4.4 Burst Program Execution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
4.4.5 Access Errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
4.4.6 FLASH Block Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
4.4.7 Vector Redirection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
4.5 Security. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
4.6 FLASH Registers and Control Bits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
4.6.1 FLASH Clock Divider Register (FCDIV). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
4.6.2 FLASH Options Register (FOPT and NVOPT) . . . . . . . . . . . . . . . . . . . . . . . . . . 58
4.6.3 FLASH Configuration Register (FCNFG). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
4.6.4 FLASH Protection Register (FPROT and NVPROT) . . . . . . . . . . . . . . . . . . . . . . 59
4.6.5 FLASH Status Register (FSTAT). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
4.6.6 FLASH Command Register (FCMD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Section 5 Resets, Interrupts, and System Configuration
5.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
5.2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
5.3 MCU Reset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
5.4 Computer Operating Properly (COP) Watchdog . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
5.5 Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
5.5.1 Interrupt Stack Frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
5.5.2 External Interrupt Request (IRQ) Pin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
5.5.3 Interrupt Vectors, Sources, and Local Masks . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
5.6 Low-Voltage Detect (LVD) System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
5.6.1 Power-On Reset Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
5.6.2 LVD Reset Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
5.6.3 LVD Interrupt Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
5.6.4 Low-Voltage Warning (LVW) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 9MC9S08GB/GT
5.7 Real-Time Interrupt (RTI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
5.8 Reset, Interrupt, and System Control Registers and Control Bits . . . . . . . . . . . . . . 70
5.8.1 Interrupt Pin Request Status and Control Register (IRQSC). . . . . . . . . . . . . . . . 70
5.8.2 System Reset Status Register (SRS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
5.8.3 System Background Debug Force Reset Register (SBDFR). . . . . . . . . . . . . . . . 73
5.8.4 System Options Register (SOPT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
5.8.5 System Device Identification Register (SDIDH, SDIDL) . . . . . . . . . . . . . . . . . . . 75
5.8.6 System Real-Time Interrupt Status and Control Register (SRTISC) . . . . . . . . . . 75
5.8.7 System Power Management Status and Control 1 Register (SPMSC1) . . . . . . . 77
5.8.8 System Power Management Status and Control 2 Register (SPMSC2) . . . . . . . 78
Section 6 Internal Clock Generator (ICG) Module
6.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
6.1.1 Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
6.1.2 Modes of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
6.2 External Signal Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
6.2.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
6.2.2 Detailed Signal Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
6.2.3 External Clock Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
6.2.4 External Crystal/Resonator Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
6.3 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
6.3.1 Off Mode (Off) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
6.3.2 Self-Clocked Mode (SCM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
6.3.3 FLL Engaged, Internal Clock (FEI) Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
6.3.4 FLL Bypassed, External Clock (FBE) Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
6.3.5 FLL Engaged, External Clock (FEE) Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
6.3.6 FLL Lock and Loss-of-Lock Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
6.3.7 FLL Loss-of-Clock Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
6.3.8 Clock Mode Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
6.4 Initialization/Application Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
6.4.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
6.4.2 Example #1: External Crystal = 32 kHz, Bus Frequency = 4.19 MHz . . . . . . . . . 96
6.4.3 Example #2: External Crystal = 4 MHz, Bus Frequency = 20 MHz. . . . . . . . . . . 98
6.4.4 Example #3: No External Crystal Connection, 5.4 MHz Bus Frequency . . . . . . 100
6.4.5 Example #4: Internal Clock Generator Trim. . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Table of Contents
MC9S08GB/GT10 MOTOROLA
6.5 ICG Registers and Control Bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
6.5.1 ICG Control Register 1 (ICGC1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
6.5.2 ICG Control Register 2 (ICGC2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
6.5.3 ICG Status Register 1 (ICGS1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
6.5.4 ICG Status Register 2 (ICGS2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
6.5.5 ICG Filter Registers (ICGFLTU, ICGFLTL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
6.5.6 ICG Trim Register (ICGTRM). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
Section 7 Central Processor Unit (CPU)
7.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
7.2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
7.3 Programmer’s Model and CPU Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
7.3.1 Accumulator (A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
7.3.2 Index Register (H:X). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
7.3.3 Stack Pointer (SP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
7.3.4 Program Counter (PC). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
7.3.5 Condition Code Register (CCR). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
7.4 Addressing Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
7.4.1 Inherent Addressing Mode (INH) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
7.4.2 Relative Addressing Mode (REL). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
7.4.3 Immediate Addressing Mode (IMM). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
7.4.4 Direct Addressing Mode (DIR). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
7.4.5 Extended Addressing Mode (EXT). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
7.4.6 Indexed Addressing Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
7.5 Special Operations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
7.5.1 Reset Sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
7.5.2 Interrupt Sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
7.5.3 Wait Mode Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
7.5.4 Stop Mode Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
7.5.5 BGND Instruction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
7.6 HCS08 Instruction Set Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
Section 8 Parallel Input/Output
8.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
8.2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 11MC9S08GB/GT
8.3 Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
8.3.1 Port A and Keyboard Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
8.3.2 Port B and Analog to Digital Converter Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . 132
8.3.3 Port C and SCI2, IIC, and High-Current Drivers . . . . . . . . . . . . . . . . . . . . . . . . 132
8.3.4 Port D, TPM1 and TPM2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
8.3.5 Port E, SCI1, and SPI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
8.3.6 Port F and High-Current Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
8.3.7 Port G, BKGD/MS, and Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
8.4 Parallel I/O Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
8.4.1 Data Direction Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
8.4.2 Internal Pullup Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
8.4.3 Slew Rate Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
8.5 Stop Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
8.6 Parallel I/O Registers and Control Bits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
8.6.1 Port A Registers (PTAD, PTAPE, PTASE, and PTADD). . . . . . . . . . . . . . . . . . 136
8.6.2 Port B Registers (PTBD, PTBPE, PTBSE, and PTBDD). . . . . . . . . . . . . . . . . . 138
8.6.3 Port C Registers (PTCD, PTCPE, PTCSE, and PTCDD) . . . . . . . . . . . . . . . . . 139
8.6.4 Port D Registers (PTDD, PTDPE, PTDSE, and PTDDD) . . . . . . . . . . . . . . . . . 141
8.6.5 Port E Registers (PTED, PTEPE, PTESE, and PTEDD). . . . . . . . . . . . . . . . . . 142
8.6.6 Port F Registers (PTFD, PTFPE, PTFSE, and PTFDD) . . . . . . . . . . . . . . . . . . 144
8.6.7 Port G Registers (PTGD, PTGPE, PTGSE, and PTGDD). . . . . . . . . . . . . . . . . 145
Section 9 Keyboard Interrupt (KBI) Module
9.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
9.1.1 Port A and Keyboard Interrupt Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
9.2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
9.3 KBI Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
9.4 Keyboard Interrupt (KBI) Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
9.4.1 Pin Enables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
9.4.2 Edge and Level Sensitivity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
9.4.3 KBI Interrupt Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
9.5 KBI Registers and Control Bits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
9.5.1 KBI Status and Control Register (KBISC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
9.5.2 KBI Pin Enable Register (KBIPE). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154
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MC9S08GB/GT12 MOTOROLA
Section 10 Timer/PWM (TPM) Module
10.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
10.2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
10.3 TPM Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
10.4 Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
10.4.1 External TPM Clock Sources. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
10.4.2 TPMxCHn — TPMx Channel n I/O Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
10.5 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
10.5.1 Counter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
10.5.2 Channel Mode Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
10.5.3 Center-Aligned PWM Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161
10.6 TPM Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
10.6.1 Clearing Timer Interrupt Flags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
10.6.2 Timer Overflow Interrupt Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
10.6.3 Channel Event Interrupt Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
10.6.4 PWM End-of-Duty-Cycle Events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
10.7 TPM Registers and Control Bits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
10.7.1 Timer x Status and Control Register (TPMxSC) . . . . . . . . . . . . . . . . . . . . . . . . 164
10.7.2 Timer x Counter Registers (TPMxCNTH:TPMxCNTL). . . . . . . . . . . . . . . . . . . . 166
10.7.3 Timer x Counter Modulo Registers (TPMxMODH:TPMxMODL) . . . . . . . . . . . . 167
10.7.4 Timer x Channel n Status and Control Register (TPMxCnSC) . . . . . . . . . . . . . 168
10.7.5 Timer x Channel Value Registers (TPMxCnVH:TPMxCnVL). . . . . . . . . . . . . . . 170
Section 11 Serial Communications Interface (SCI) Module
11.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
11.2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
11.3 SCI System Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
11.4 Baud Rate Generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
11.5 Transmitter Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
11.5.1 Transmitter Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
11.5.2 Send Break and Queued Idle. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176
11.6 Receiver Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176
11.6.1 Receiver Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176
11.6.2 Data Sampling Technique . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178
11.6.3 Receiver Wakeup Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179
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MOTOROLA 13MC9S08GB/GT
11.7 Interrupts and Status Flags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179
11.8 Additional SCI Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180
11.8.1 8- and 9-Bit Data Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180
11.9 Stop Mode Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181
11.9.1 Loop Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181
11.9.2 Single-Wire Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181
11.10 SCI Registers and Control Bits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181
11.10.1 SCI x Baud Rate Registers (SCIxBDH, SCIxBHL). . . . . . . . . . . . . . . . . . . . . . . 182
11.10.2 SCI x Control Register 1 (SCIxC1). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182
11.10.3 SCI x Control Register 2 (SCIxC2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184
11.10.4 SCI x Status Register 1 (SCIxS1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185
11.10.5 SCI x Status Register 2 (SCIxS2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187
11.10.6 SCI x Control Register 3 (SCIxC3). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188
11.10.7 SCI x Data Register (SCIxD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189
Section 12 Serial Peripheral Interface (SPI) Module
12.1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192
12.2 Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192
12.2.1 SPI System Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192
12.2.2 SPI Module Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193
12.2.3 SPI Baud Rate Generation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195
12.3 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195
12.3.1 SPI Clock Formats. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196
12.3.2 SPI Pin Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198
12.3.3 SPI Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199
12.3.4 Mode Fault Detection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199
12.4 SPI Registers and Control Bits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200
12.4.1 SPI Control Register 1 (SPIC1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200
12.4.2 SPI Control Register 2 (SPIC2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202
12.4.3 SPI Baud Rate Register (SPIBR). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203
12.4.4 SPI Status Register (SPIS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204
12.4.5 SPI Data Register (SPID). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205
Section 13 Inter-Integrated Circuit (IIC) Module
13.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208
13.1.1 Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208
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MC9S08GB/GT14 MOTOROLA
13.1.2 Modes of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208
13.1.3 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208
13.1.4 Detailed Signal Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209
13.2 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209
13.2.1 IIC Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210
13.3 Resets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213
13.4 Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213
13.4.1 Byte Transfer Interrupt. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213
13.4.2 Address Detect Interrupt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213
13.4.3 Arbitration Lost Interrupt. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214
13.5 IIC Registers and Control Bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214
13.5.1 IIC Address Register (IICA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214
13.5.2 IIC Frequency Divider Register (IICF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 215
13.5.3 IIC Control Register (IICC). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217
13.5.4 IIC Status Register (IICS). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218
13.5.5 IIC Data I/O Register (IICD). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220
Section 14 Analog-to-Digital Converter (ATD) Module
14.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222
14.1.1 Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222
14.1.2 Modes of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222
14.1.3 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222
14.2 Signal Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224
14.2.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224
14.3 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224
14.3.1 Mode Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225
14.3.2 Sample and Hold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225
14.3.3 Analog Input Multiplexer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 227
14.3.4 ATD Module Accuracy Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 227
14.4 Resets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230
14.5 Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230
14.6 ATD Registers and Control Bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230
14.6.1 ATD Control (ATDC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 231
14.6.2 ATD Status and Control (ATDSC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 233
14.6.3 ATD Result Data (ATDRH, ATDRL). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235
14.6.4 ATD Pin Enable (ATDPE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 15MC9S08GB/GT
Section 15 Development Support
15.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237
15.2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238
15.3 Background Debug Controller (BDC). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239
15.3.1 BKGD Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239
15.3.2 Communication Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 240
15.3.3 BDC Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 244
15.3.4 BDC Hardware Breakpoint. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 246
15.4 On-Chip Debug System (DBG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 247
15.4.1 Comparators A and B. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 247
15.4.2 Bus Capture Information and FIFO Operation. . . . . . . . . . . . . . . . . . . . . . . . . . 248
15.4.3 Change-of-Flow Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 248
15.4.4 Tag vs. Force Breakpoints and Triggers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 249
15.4.5 Trigger Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 249
15.4.6 Hardware Breakpoints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 251
15.5 Registers and Control Bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 251
15.5.1 BDC Registers and Control Bits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 251
15.5.2 System Background Debug Force Reset Register (SBDFR). . . . . . . . . . . . . . . 253
15.5.3 DBG Registers and Control Bits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 254
Appendix A Electrical Characteristics
A.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 261
A.2 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 261
A.3 Thermal Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 262
A.4 Electrostatic Discharge (ESD) Protection Characteristics . . . . . . . . . . . . . . . . . . . 263
A.5 DC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 263
A.6 Supply Current Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 267
A.7 ATD Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 270
A.8 Internal Clock Generation Module Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . 272
A.8.1 ICG Frequency Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273
A.9 AC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 274
A.9.1 Control Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 274
A.9.2 Timer/PWM (TPM) Module Timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 275
A.9.3 SPI Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 276
A.10 FLASH Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 280
Table of Contents
MC9S08GB/GT16 MOTOROLA
Appendix B Ordering Information and Mechanical Drawings
B.1 Ordering Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 281
B.2 Mechanical Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 281
B.3 64-Pin LQFP Package Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 282
B.4 44-Pin QFP Package Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 283
B.5 42-Pin SDIP Package Drawing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 284
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 17MC9S08GB/GT
Section 1 Introduction
1.1 Overview
The MC9S08GB/GT are members of the low-cost, high-performance HCS08 Family of 8-bit
microcontroller units (MCUs). All MCUs in the family use the enhanced HCS08 core and are available
with a variety of modules, memory sizes, memory types, and package types.
1.2 Features
Features have been organized to reflect:
• Standard features of the HCS08 Family
• Features of the MC9S08GB/GT MCU
1.2.1 Standard Features of the HCS08 Family
• 40-MHz HCS08 CPU (central processor unit)
• HC08 instruction set with added BGND instruction
• Background debugging system (see also the Development Support section)
• Breakpoint capability to allow single breakpoint setting during
in-circuit debugging (plus two more breakpoints in on-chip debug module)
• Debug module containing two comparators and nine trigger modes. Eight deep FIFO for storing
change-of-flow addresses and event-only data. Debug module supports both tag and force
breakpoints.
• Support for up to 32 interrupt/reset sources
• Power-saving modes: wait plus three stops
• System protection features:
– Optional computer operating properly (COP) reset
– Low-voltage detection with reset or interrupt
– Illegal opcode detection with reset
– Illegal address detection with reset (some devices don’t have illegal addresses)
1.2.2 Features of MC9S08GB/GT Series of MCUs
• On-chip in-circuit programmable FLASH memory with block protection and security options (see
Table 1-1 for device specific information)
• On-chip random-access memory (RAM) (see Table 1-1 for device specific information)
• 8-channel, 10-bit analog-to-digital converter (ATD)
Introduction
MC9S08GB/GT18 MOTOROLA
• Two serial communications interface modules (SCI)
• Serial peripheral interface module (SPI)
• Clock source options include crystal, resonator, external clock or internally generated clock with
precision NVM trimming
• Inter-integrated circuit bus module to operate up to 100 kbps (IIC)
• One 3-channel and one 5-channel 16-bit timer/pulse width modulator (TPM) modules with
selectable input capture, output compare, and edge-aligned PWM capability on each channel. Each
timer module may be configured for buffered, centered PWM (CPWM) on all channels (TPMx).
• 8-pin keyboard interrupt module (KBI)
• 16 high-current pins (limited by package dissipation)
• Software selectable pullups on ports when used as input. Selection is on an individual port bit basis.
During output mode, pullups are disengaged.
• Internal pullup on RESET and IRQ pin to reduce customer system cost
• 56 general-purpose input/output (I/O) pins, depending on package selection
• 64-pin low-profile quad flat package (LQFP) — MC9S08GBxx
• 44-pin quad flat package (QFP) — MC9S08GTxx
• 42-pin shrink dual in-line package (SDIP) — MC9S08GTxx
1.2.3 Devices in the MC9S08GB/GT Series
Table 1-1 lists the devices available in the MC9S08GB/GT series and summarizes the differences among
them.
1.3 MCU Block Diagrams
These block diagrams shows the structure of the MC9S08GB/GT MCUs.
Table 1-1 Devices in the MC9S08GB/GT Series
Device FLASH RAM TPM I/O Packages
MC9S08GB60 60K 4K
One3-channel
and one
5-channel
16-bit timer
56 64 LQFP
MC9S08GB32 32K 2K
One3-channel
and one
5-channel
16-bit timer
56 64 LQFP
MC9S08GT60 60K 4K Two
2-channel/16-
bit timers
36 44 QFP
34 42 SDIP
MC9S08GT32 32K 2K Two
2-channel/16-
bit timers
36 44 QFP
34 42 SDIP
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 19MC9S08GB/GT
Figure 1-1 MCMC9S08GBxx Block Diagram
PTD3/TPM2CH0
PTD4/TPM2CH1
PTD5/TPM2CH2
PTD6/TPM2CH3
PTC1/RxD2
PTC0/TxD2
VSS
VDD
PTE3/MISO
PTE2/SS
PTA7/KBIP7–
PTE0/TxD1
PTE1/RxD1
PTD2/TPM1CH2
PTD1/TPM1CH1
PTD0/TPM1CH0
PTC7
PTC6
PTC5
PTC4
PTC3/SCL
PTC2/SDA
PORT A
PORT C
PORT D
PORT E
8-BIT KEYBOARD
INTERRUPT MODULE (KBI)
IIC MODULE (IIC)
SERIAL PERIPHERAL
INTERFACE MODULE (SPI)
USER FLASH
USER RAM
(GB60 = 4096 BYTES)
DEBUG
MODULE (DBG)
(GB60 = 61,268 BYTES)
HCS08 CORE
CPU
BDC
INT
BKP
NOTES:
1. Port pins are software configurable with pullup device if input port.
2. Pin contains software configurable pullup/pulldown device if IRQ enabled (IRQPE = 1).
3. IRQ does not have a clamp diode to VDD. IRQ should not be driven above VDD.
4. Pin contains integrated pullup device.
5. High current drive
6. Pins PTA[7:4] contain software configurable pullup/pulldown device.
NOTE 1
NOTE 1
3-CHANNEL TIMER/PWM
MODULE (TPM1)
PTB7/AD7–
PORT B
PTE5/SPSCK
PTE4/MOSI
PTE6
PTE7
INTERFACE MODULE (SCI2)
HCS08 SYSTEM CONTROL
RESETS AND INTERRUPTS
MODES OF OPERATION
POWER MANAGEMENT
VOLTAGE
REGULATOR
RTI
SERIAL COMMUNICATIONS
COP
IRQ LVD
INTERNAL BUS
LOW-POWER OSCILLATOR
INTERNAL CLOCK
GENERATOR (ICG)
RESET
VSSAD
VDDAD
VREFH
VREFL
ANALOG-TO-DIGITAL
CONVERTER (ATD)
INTERFACE MODULE (SCI1)
SERIAL COMMUNICATIONS
5-CHANNEL TIMER/PWM
MODULE (TPM2)
PORT F
PTF7–PTF0
NOTE 1
PTD7/TPM2CH4
8
PTA0/KBIP0
8
PTB0/AD0
8
PTG3
PTG2/EXTAL
PTG0/BKGD/MS
PTG1/XTAL
PORT G
PTG4
PTG6
PTG7
PTG5
NOTE 4
NOTES 1, 5
(GB32 = 32,768 BYTES)
(GB32 = 2048 BYTES)
IRQ
NOTES 2, 3
10-BIT
NOTES 1, 6
NOTE 1
NOTES 1, 5
Introduction
MC9S08GB/GT20 MOTOROLA
Figure 1-2 MCMC9S08GTxx Block Diagram
PTD3/TPM2CH0
PTD4/TPM2CH1
PTC1/RxD2
PTC0/TxD2
VSS
VDD
PTE3/MISO
PTE2/SS
PTA7/KBIP7–
PTE0/TxD1
PTE1/RxD1
PTD1/TPM1CH1
PTD0/TPM1CH0
PTC6 (NOTE 6)
PTC5 (NOTE 6)
PTC4
PTC3/SCL
PTC2/SDA
PORT A
PORT C
PORT D
PORT E
8-BIT KEYBOARD
INTERRUPT MODULE (KBI)
IIC MODULE (IIC)
SERIAL PERIPHERAL
INTERFACE MODULE (SPI)
USER FLASH
USER RAM
(GT60 = 4096 BYTES)
DEBUG
MODULE (DBG)
(GT60 = 61,268 BYTES)
HCS08 CORE
CPU
BDC
INT
BKP
NOTES:
1. Port pins are software configurable with pullup device if input port.
2. Pin contains software configurable pullup/pulldown device if IRQ enabled (IRQPE = 1).
3. IRQ does not have a clamp diode to VDD. IRQ should not be driven above VDD.
4. Pin contains integrated pullup device.
5. High current drive
6. PTC[6:5] are not available on the 42-pin SDIP package.
7. Pins PTA[7:4] contain software configurable pullup/pulldown device.
8. Only two timer channels per TPM are bonded out. All channels are available for use.
NOTE 1
NOTE 1
3-CHANNEL TIMER/PWM
MODULE (TPM1)
PTB7/AD7–
PORT B
PTE5/SPSCK
PTE4/MOSI
INTERFACE MODULE (SCI2)
HCS08 SYSTEM CONTROL
RESETS AND INTERRUPTS
MODES OF OPERATION
POWER MANAGEMENT
VOLTAGE
REGULATOR
RTI
SERIAL COMMUNICATIONS
COP
IRQ LVD
INTERNAL BUS
LOW-POWER OSCILLATOR
INTERNAL CLOCK
GENERATOR (ICG)
RESET
VSSAD
VDDAD
VREFH
VREFL
ANALOG-TO-DIGITAL
CONVERTER (ATD)
INTERFACE MODULE (SCI1)
SERIAL COMMUNICATIONS
5-CHANNEL TIMER/PWM
MODULE (TPM2)
NOTE 1
8
PTA0/KBIP0
8
PTB0/AD0
PTG2/EXTAL
PTG0/BKGD/MS
PTG1/XTAL
PORT G
NOTE 3
NOTES 1, 5
(GT32 = 32,768 BYTES)
(GT32 = 2048 BYTES)
IRQ
NOTES 2, 3
10-BIT
NOTES 1, 7
NOTE 1
(NOTE 8)
(NOTE 8)
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 21MC9S08GB/GT
1.4 System Clock Distribution
Figure 1-3 System Clock Distribution Diagram
Some of the modules inside the MCU have clock source choices. Figure 1-3 shows a simplified clock
connection diagram. The ICG supplies the clock sources:
• RCLK is the basic reference clock of the device. It is either:
– The external crystal oscillator
– An external clock source
– The internal clock generator
Control bits inside the ICG determine which source is connected to this signal line.
• ICGOUT is an output of the ICG module. It is either:
– The external crystal oscillator
– An external clock source
– The output of the digitally-controlled oscillator (DCO) in the frequency-locked loop
sub-module
Control bits inside the ICG determine which source is connected.
• FFE is a control signal generated inside the ICG. If the frequency of ICGOUT > 4 * the frequency
of ICGRCLK, this signal is a logic 1 and the fixed-frequency clock will be the ICGRCLK.
Otherwise the fixed-frequency clock will be BUSCLK.
• LCLK — Development tools can select this internal self-clocked source (~ 8 MHz) to speed up
BDC communications in systems where the bus clock is slow.
• ERCLK — External reference clock can be selected as the real-time interrupt clock source.
TPM1 TPM2 IIC SCI1 SCI2 SPI
BDC
CPU ATD RAM FLASH
ICG
ICGOUT ÷2
FFE
ICGRCLK
SYSTEM
LOGIC
BUSCLK
ICGLCLK*
ATD has min and max
frequency requirements.
See ATD section and
FLASH has frequency
requirements for program
and erase operation.
See Appendix A.
Appendix A.
CONTROL
FIXED FREQ CLOCK (XCLK)
ICGERCLK RTI
* ICGLCLK is the alternate BDC clock source for the MC9S08GB/GT.
Introduction
MC9S08GB/GT22 MOTOROLA
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 23MC9S08GB/GT
Section 2 Pins and Connections
2.1 Introduction
This section describes signals that connect to package pins. It includes a pinout diagram, a table of signal
properties, and detailed discussion of signals.
2.2 Device Pin Assignment
Figure 2-1 MC9S08GBxx in 64-Pin LQFP Package
PTC3/SCL
1
2
3
4
5
6
7
8
PTC0/TxD2
PTC1/RxD2
PTC4
PTC5
PTC6
PTC7
PTD0/TPM1CH0
VDD
VSS
PTE7
PTE6
PTE5/SPSCK
PTE4/MOSI
VREFH
VREFL
PTF5
PTF6
PTF7
PTB2/AD2
PTB7/AD7
PTA5/KBIP5
PTF0
PTG6
VSSAD
VDDAD
PTF1
PTA2/KBIP2
PTA6/KBIP6
PTA7/KBIP7
43
42
41
40
39
38
18
19
20 21 22 23
505152535455
17 32
33
49
48
64
9
PTF2
10
PTF3
11
PTF4
16
IRQ
PTD1/TPM1CH1
24
PTD2/TPM1CH2
25
PTD3/TPM2CH0
26
PTD4/TPM2CH1
27
PTB6/AD6
37
PTB5/AD5
36
PTB4/AD4
35
PTB3/AD3
34
PTG0/BKGD/MS
56
PTG1/XTAL
57
PTG2/EXTAL
58
PTG3
59
PTC2/SDA
12
PTE0/TxD1
13
14
15
PTE1/RxD1
PTD5/TPM2CH2
28 29 30 31
PTA0/KBIP0
44
45
46
PTA1/KBIP1
47
PTG5
63 62 61
PTG4
60
RESET
PTG7
PTE2/SS
PTE3/MISO
PTD6/TPM2CH3
PTD7/TPM2CH4
PTB1/AD1
PTB0/AD0
PTA4/KBIP4
PTA3/KBIP3
Pins and Connections
MC9S08GB/GT24 MOTOROLA
Figure 2-2 MC9S08GTxx in 44-Pin QFP Package
44
34
43
42
41
40
39
38
37
36
35
1
2
3
4
5
6
7
8
9
10
11
13
14
15
16
17
18
19
20
21
22
33
32
31
30
29
28
27
26
25
24
12
23
RESET
PTE0/TxD1
PTE1/RxD1
IRQ
PTC0/TxD2
PTC1/RxD2
PTC2/SDA
PTC3/SCL
PTC4
PTC5
PTC6
PTD1/TPM1CH1
PTD0/TPM1CH0
VDD
VSS
PTE5/SPSCK
PTE4/MOSI
PTE3/MISO
PTE2/SS
PTD3/TPM2CH0
PTD4/TPM2CH1
PTB0/AD0
PTB6/AD6
PTB7/AD7
VREFH
VREFL
PTA0/KBIP0
PTB2/AD2
PTB3/AD3
PTB1/AD1
PTB4/AD4
PTB5/AD5
PTA4/KBIP4
PTA5/KBIP5
VDDAD
PTG2/EXTAL
PTG1/XTAL
PTG0/BKGD/MS
VSSAD
PTA1/KBIP1
PTA6/KBIP6
PTA7/KBIP7
PTA3/KBIP3
PTA2/KBIP2
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 25MC9S08GB/GT
Figure 2-3 MCMC9S08GTxx in 42-Pin SDIP Package
2.3 Recommended System Connections
Figure 2-4 shows pin connections that are common to almost all MC9S08GBxx application systems.
MC9S08GTxx connections will be similar except for the amount of I/O pins available. A more detailed
discussion of system connections follows.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
42
41
40
39
38
37
36
35
34
33
32
31
30
29
IRQ
PTE1/RxD1
PTE0/TxD1
VDDAD
PTC2/SDA
PTC3/SCL
PTC4
PTB5/AD5
PTB6/AD6
PTB7/AD7
VREFH
VREFL
PTA0/KBIP0
PTA1/KBIP1
PTA2/KBIP2
PTA4/KBIP4
PTA3/KBIP3
PTB4/AD4
PTA5/KBIP5
PTA6/KBIP6
PTA7/KBIP7
VSSAD
PTG0/BKGD/MS
PTG1/XTAL
PTG2/EXTAL
RESET
PTC0/TxD2
PTC1/RXD2
15 28
PTE2/SS PTB3/AD3
16 27
PTE3/MISO PTB2/AD2
17 26
PTE4/MOSI PTB1/AD1
18 25
PTE5/SPSCK PTB0/AD0
19 24
VSS PTD4/TPM2CH1
20 23
VDD PTD3/TPM2CH0
21 22
PTD0/TPM1CH0 PTD1/TPM1CH1
Pins and Connections
MC9S08GB/GT26 MOTOROLA
Figure 2-4 Basic System Connections
VDD
VSS
XTAL
EXTAL
BKGD/MS
RESET
OPTIONAL
MANUAL
RESET
PORT
A
VDD
1
BACKGROUND HEADER
C2
C1 X1
RFRS
CBY
0.1 µF
CBLK
10 µF
+
3 V
+
SYSTEM
POWER
I/O AND
PERIPHERAL
INTERFACE TO
SYSTEM
APPLICATION
PTA0/KBIP0
PTA1/KBIP1
PTA2/KBIP2
PTA3/KBIP3
PTA4/KBIP4
PTA5/KBIP5
PTA6/KBIP6
PTA7/KBIP7
VDD
PORT
B
PTB0/AD0
PTB1/AD1
PTB2/AD2
PTB3/AD3
PTB4/AD4
PTB5/AD5
PTB6/AD6
PTB7/AD7
PORT
C
PTC0/TxD2
PTC1/RxD2
PTC2/SDA
PTC3/SCL
PTC4
PTC5
PTC6
PTC7
PORT
D
PTD0/TPM1CH0
PTD1/TPM1CH1
PTD2/TPM1CH2
PTD3/TPM2CH0
PTD4/TPM2CH1
PTD5/TPM2CH2
PTD6/TPM2CH3
PTD7/TPM2CH4
PORT
E
PTE0/TxD1
PTE1/RxD1
PTE2/SS
PTE3/MISO
PTE4/MOSI
PTE5/SPSCK
PTE6
PTE7
PORT
G
PTG0/BKDG/MS
PTG1/XTAL
PTG2/EXTAL
PTG3
PTG4
PTG5
PTG6
PTG7
PORT
F
PTF0
PTF1
PTF2
PTF3
PTF4
PTF5
PTF6
PTF7
IRQ
ASYNCHRONOUS
INTERRUPT
INPUT
NOTES:
1. Not required if
using the internal
oscillator option.
2. These are the
same pins as
PTG1 and PTG2.
3. BKGD/MS is the
same pin as PTG0.
NOTE 1
NOTE 2
NOTE 2
NOTE 3
MC9S08GBxx
VDDAD
VSSAD
CBYAD
0.1 µF
VREFL
VREFH
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 27MC9S08GB/GT
2.3.1 Power
VDD and VSS are the primary power supply pins for the MCU. This voltage source supplies power to all
I/O buffer circuitry and to an internal voltage regulator. The internal voltage regulator provides regulated
lower-voltage source to the CPU and other internal circuitry of the MCU.
Typically, application systems have two separate capacitors across the power pins. In this case, there
should be a bulk electrolytic capacitor, such as a 10-µF tantalum capacitor, to provide bulk charge storage
for the overall system and a 0.1-µF ceramic bypass capacitor located as close to the MCU power pins as
practical to suppress high-frequency noise.
VDDAD and VSSAD are the analog power supply pins for the MCU. This voltage source supplies power to
theATD.A0.1-µF ceramic bypasscapacitorshouldbelocated as closeto theMCU power pinsas practical
to suppress high-frequency noise.
2.3.2 Oscillator
Out of reset the MCU uses an internally generated clock (self-clocked mode — fSelf_reset) equivalent to
about 8-MHz crystal rate. This frequency source is used during reset startup and can be enabled as the
clock source for stop recovery to avoid the need for a long crystal startup delay. This MCU also contains
a trimmable internal clock generator (ICG) module that can be used to run the MCU. For more information
on the ICG, see the Internal Clock Generator section.
The oscillator in this MCU is a Pierce oscillator that can accommodate a crystal or ceramic resonator in
either of two frequency ranges selected by the RANGE bit in the ICGC1 register. Rather than a crystal or
ceramic resonator, an external oscillator can be connected to the EXTAL input pin, and the XTAL output
pin must be left unconnected.
Refer to Figure 2-4 for the following discussion. RS (when used) and RF should be low-inductance
resistors such as carbon composition resistors. Wire-wound resistors, and some metal film resistors, have
too much inductance. C1 and C2 normally should be high-quality ceramic capacitors that are specifically
designed for high-frequency applications.
RFis used to provide a bias path to keep the EXTAL input in its linear range during crystal startup and its
value is not generally critical. Typical systems use 1 MΩ to 10 MΩ. Higher values are sensitive to
humidity and lower values reduce gain and (in extreme cases) could prevent startup.
C1 and C2 are typically in the 5-pF to 25-pF range and are chosen to match the requirements of a specific
crystal or resonator. Be sure to take into account printed circuit board (PCB) capacitance and MCU pin
capacitance when sizing C1 and C2. The crystal manufacturer typically specifies a load capacitance which
is the series combination of C1 and C2 which are usually the same size. As a first-order approximation,
use 10 pF as an estimate of combined pin and PCB capacitance for each oscillator pin (EXTAL and
XTAL).
2.3.3 Reset
RESET is a dedicated pin with a pullup device built in. It has input hysteresis, a high current output driver,
and no output slew rate control. Internal power-on reset and low-voltage reset circuitry typically make
external reset circuitry unnecessary. This pin is normally connected to the standard 6-pin background
Pins and Connections
MC9S08GB/GT28 MOTOROLA
debugconnector so a developmentsystem can directly resetthe MCU system. Ifdesired, a manual external
reset can be added by supplying a simple switch to ground (pull reset pin low to force a reset).
Whenever any reset is initiated (whether from an external signal or from an internal system), the reset pin
is driven low for about 34 cycles of fSelf_reset, released, and sampled again about 38 cycles of fSelf_reset
later. If reset was caused by an internal source such as low-voltage reset or watchdog timeout, the circuitry
expects the reset pin sample to return a logic 1. If the pin is still low at this sample point, the reset is
assumed to be from an external source. The reset circuitry decodes the cause of reset and records it by
setting a corresponding bit in the system control reset status register (SRS).
Never connect any significant capacitance to the reset pin because that would interfere with the circuit and
sequence that detects the source of reset. If an external capacitance prevents the reset pin from rising to a
valid logic 1 before the reset sample point, all resets will appear to be external resets.
2.3.4 Background/Mode Select (PTG0/BKGD/MS)
The background/mode select (BKGD/MS) shares its function with an I/O port pin. While in reset the pin
functions as a mode select pin. Immediately after reset rises the pin functions as the background pin and
can be used for background debug communication. While functioning as a background/mode select pin
the pin includes an internal pullup device, input hysteresis, a standard output driver, and no output slew
rate control. When used as an I/O port (PTG0) the pin is limited to output only.
If nothing is connected to this pin, the MCU will enter normal operating mode at the rising edge of reset.
If a debug system is connected to the 6-pin standard background debug header, it can hold BKGD/MS low
during the rising edge of reset which forces the MCU to active background mode.
The BKGD pin is used primarily for background debug controller (BDC) communications using a custom
protocol that uses 16 clock cycles of the target MCU’s BDC clock per bit time. The target MCU’s BDC
clock could be as fast as the bus clock rate, so there should never be any significant capacitance connected
to the BKGD/MS pin that could interfere with background serial communications.
Although the BKGD pin is a pseudo open-drain pin, the background debug communication protocol
provides brief, actively driven, high speedup pulses to ensure fast rise times. Small capacitances from
cables and the absolute value of the internal pullup device play almost no role in determining rise and fall
times on the BKGD pin.
2.3.5 General-Purpose I/O and Peripheral Ports
The remaining 55 pins are shared among general-purpose I/O and on-chip peripheral functions such as
timers and serial I/O systems. (Twenty of these pins are not bonded out on the 44-pin package and
twenty-two are not bonded out on the 42-pin package.) Immediately after reset, all 55 of these pins are
configured as high-impedance general-purpose inputs with internal pullup devices disabled.
NOTE: To avoid extra current drain from floating input pins, the reset initialization routine
in the application program should either enable on-chip pullup devices or change
the direction of unused pins to outputs so the pins do not float.
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 29MC9S08GB/GT
For information about controlling these pins as general-purpose I/O pins, see the Parallel Input/Output
section. For information about how and when on-chip peripheral systems use these pins, refer to the
appropriate section from Table 2-1.
When an on-chip peripheral system is controlling a pin, data direction control bits still determine what is
read from port data registers even though the peripheral module controls the pin direction by controlling
the enable for the pin’s output buffer. See the Parallel Input/Output section for more details.
Pullup enable bits for each input pin control whether on-chip pullup or pulldown devices are enabled
whenever the pin is acting as an input even if it is being controlled by an on-chip peripheral module. When
the PTA7–PTA4 pins are controlled by the KBI module and are configured for rising-edge/high-level
sensitivity, the pullup enable control bits enable pulldown devices rather than pullup devices. Similarly,
when IRQ is configured as the IRQ input and is set to detect rising edges, the pullup enable control bit
enables a pulldown device rather than a pullup device.
Table 2-1 Pin Sharing References
Port Pins Alternate
Function Reference(1)
NOTES:
1. See this section for information about modules that share these pins.
PTA7–PTA0 KBI7–KBI0 Keyboard Interrupt (KBI) Module
PTB7–PTB0 AD7–AD0 Analog-to-Digital Converter (ATD) Module
PTC7–PTC4 — Parallel Input/Output
PTC3–PTC2 SCL–SDA Inter-Integrated Circuit (IIC) Module
PTC1–PTC0 RxD2–TxD2 Serial Communications Interface (SCI) Module
PTD7–PTD3 TPM2CH4–
TPM2CH0 Timer/PWM (TPM) Module
PTD2–PTD0 TPM1CH2–
TPM1CH0 Timer/PWM (TPM) Module
PTE7–PTE6 — Parallel Input/Output
PTE5
PTE4
PTE3
PTE2
SPSCK
MISO
MOSI
SS
Serial Peripheral Interface (SPI) Module
PTE1–PTE0 RxD1–TxD1 Serial Communications Interface (SCI) Module
PTF7–PTF0 — Parallel Input/Output
PTG7–PTG3 — Parallel Input/Output
PTG2–PTG1 EXTAL–XTAL Internal Clock Generator (ICG) Module
PTG0 BKGD/MS Development Support
Pins and Connections
MC9S08GB/GT30 MOTOROLA
2.3.6 Signal Properties Summary
Table 2-2 summarizes I/O pin characteristics. These characteristics are determined by the way the
common pin interfaces are hardwired to internal circuits.
Table 2-2 Signal Properties
Pin
Name Dir High
Current Pin Output
Slew (1) Pull-Up(2) Comments
VDD ———
VSS ———
VDDAD ———
VSSAD ———
VREFH ———
VREFL ———
RESET I/O Y N Y
IRQ I — — Y
IRQPE must be set to enable IRQ function.
IRQ does not have a clamp diode to VDD. IRQ should
not be driven above VDD.
Pullup/pulldown active when IRQ pin function
enabled. Pullup forced on when IRQ enabled for
falling edges; pulldown forced on when IRQ enabled
for rising edges.
PTA0/KBIP0 I/O N SWC SWC
PTA1/KBIP1 I/O N SWC SWC
PTA2/KBIP2 I/O N SWC SWC
PTA3/KBIP3 I/O N SWC SWC
PTA4/KBIP4 I/O N SWC SWC Pullup/pulldown active when KBI pin function
enabled. Pullup forced on when KBIPx enabled for
falling edges; pulldown forced on when KBIPx
enabled for rising edges.
PTA5/KBIP5 I/O N SWC SWC
PTA6/KBIP6 I/O N SWC SWC
PTA7/KBIP7 I/O N SWC SWC
PTB0/AD0 I/O N SWC SWC
PTB1/AD1 I/O N SWC SWC
PTB2/AD2 I/O N SWC SWC
PTB3/AD3 I/O N SWC SWC
PTB4/AD4 I/O N SWC SWC
PTB5/AD5 I/O N SWC SWC
PTB6/AD6 I/O N SWC SWC
PTB7/AD7 I/O N SWC SWC
PTC0/TxD2 I/O Y SWC SWC When pin is configured for SCI function, pin is
configured for partial output drive.
PTC1/RxD2 I/O Y SWC SWC
PTC2/SDA I/O Y SWC SWC
PTC3/SCL I/O Y SWC SWC
PTC4 I/O Y SWC SWC
PTC5 I/O Y SWC SWC Not available on 42-pin pkg
PTC6 I/O Y SWC SWC Not available on 42-pin pkg
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 31MC9S08GB/GT
PTC7 I/O Y SWC SWC Not available on 42- or 44-pin pkg
PTD0/TPM1CH0 I/O N SWC SWC
PTD1/TPM1CH1 I/O N SWC SWC
PTD2/TPM1CH2 I/O N SWC SWC Not available on 42- or 44-pin pkg
PTD3/TPM2CH0 I/O N SWC SWC
PTD4/TPM2CH1 I/O N SWC SWC
PTD5/TPM2CH2 I/O N SWC SWC Not available on 42- or 44-pin pkg
PTD6/TPM2CH3 I/O N SWC SWC Not available on 42- or 44-pin pkg
PTD7/TPM2CH4 I/O N SWC SWC Not available on 42- or 44-pin pkg
PTE0/TxD1 I/O N SWC SWC
PTE1/RxD1 I/O N SWC SWC
PTE2/SS I/O N SWC SWC
PTE3/MISO I/O N SWC SWC
PTE4/MOSI I/O N SWC SWC
PTE5/SPSCK I/O N SWC SWC
PTE6 I/O N SWC SWC Not available on 42- or 44-pin pkg
PTE7 I/O N SWC SWC Not available on 42- or 44-pin pkg
PTF0 I/O Y SWC SWC Not available on 42- or 44-pin pkg
PTF1 I/O Y SWC SWC Not available on 42- or 44-pin pkg
PTF2 I/O Y SWC SWC Not available on 42- or 44-pin pkg
PTF3 I/O Y SWC SWC Not available on 42- or 44-pin pkg
PTF4 I/O Y SWC SWC Not available on 42- or 44-pin pkg
PTF5 I/O Y SWC SWC Not available on 42- or 44-pin pkg
PTF6 I/O Y SWC SWC Not available on 42- or 44-pin pkg
PTF7 I/O Y SWC SWC Not available on 42- or 44-pin pkg
PTG0/BKGD/MS O N SWC SWC Pullup active when BDM function enabled. Slew rate
always off.
PTG1/XTAL I/O N SWC SWC Pullup and slew rate disabled when XTAL pin
function.
PTG2/EXTAL I/O N SWC SWC Pullup and slew rate disabled when EXTAL pin
function.
PTG3 I/O N SWC SWC Not available on 42- or 44-pin pkg
PTG4 I/O N SWC SWC Not available on 42- or 44-pin pkg
PTG5 I/O N SWC SWC Not available on 42- or 44-pin pkg
PTG6 I/O N SWC SWC Not available on 42- or 44-pin pkg
PTG7 I/O N SWC SWC Not available on 42- or 44-pin pkg
NOTES:
1. SWC is software controlled slew rate, the register is associated with the respective port.
2. SWC is software controlled pullup resistor, the register is associated with the respective port.
Table 2-2 Signal Properties (Continued)
Pin
Name Dir High
Current Pin Output
Slew (1) Pull-Up(2) Comments
Pins and Connections
MC9S08GB/GT32 MOTOROLA
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 33MC9S08GB/GT
Section 3 Modes of Operation
3.1 Introduction
The operating modes of the MC9S08GB/GT are described in this section. Entry into each mode, exit from
each mode, and functionality while in each of the modes are described.
3.2 Features
• Active background mode for code development
• Wait mode:
– CPU shuts down to conserve power
– System clocks running
– Full voltage regulation maintained
• Stop modes:
– System clocks stopped; voltage regulator in standby
– Stop1 — Full power down of internal circuits for maximum power savings
– Stop2 — Partial power down of internal circuits, RAM contents retained
– Stop3 — All internal circuits powered for fast recovery
3.3 Run Mode
This is the normal operating mode for the MC9S08GB/GT. This mode is selected when the BKGD/MS
pin is high at the rising edge of reset. In this mode, the CPU executes code from internal memory with
execution beginning at the address fetched from memory at $FFFE:$FFFF after reset.
3.4 Active Background Mode
The active background mode functions are managed through the background debug controller (BDC) in
the HCS08 core. The BDC, together with the on-chip debug module (DBG), provide the means for
analyzing MCU operation during software development.
Active background mode is entered in any of five ways:
• When the BKGD/MS pin is low at the rising edge of reset
• When a BACKGROUND command is received through the BKGD pin
• When a BGND instruction is executed
• When encountering a BDC breakpoint
• When encountering a DBG breakpoint
Modes of Operation
MC9S08GB/GT34 MOTOROLA
Once in active background mode, the CPU is held in a suspended state waiting for serial background
commands rather than executing instructions from the user’s application program.
Background commands are of two types:
• Non-intrusive commands, defined as commands that can be issued while the user program is
running. Non-intrusive commands can be issued through the BKGD pin while the MCU is in run
mode; non-intrusive commands can also be executed when the MCU is in the active background
mode. Non-intrusive commands include:
– Memory access commands
– Memory-access-with-status commands
– BDC register access commands
– The BACKGROUND command
• Active background commands, which can only be executed while the MCU is in active background
mode. Active background commands include commands to:
– Read or write CPU registers
– Trace one user program instruction at a time
– Leave active background mode to return to the user’s application program (GO)
The active background mode is used to program a bootloader or user application program into the FLASH
program memory before the MCU is operated in run mode for the first time. When the MC9S08GB/GT is
shipped from the Motorola factory, the FLASH program memory is erased by default unless specifically
noted so there is no program that could be executed in run mode until the FLASH memory is initially
programmed. The active background mode can also be used to erase and reprogram the FLASH memory
after it has been previously programmed.
For additional information about the active background mode, refer to the Development Support section.
3.5 Wait Mode
Wait mode is entered by executing a WAIT instruction. Upon execution of the WAIT instruction, the CPU
enters a low-power state in which it is not clocked. The I bit in CCR is cleared when the CPU enters the
wait mode, enabling interrupts. When an interrupt request occurs, the CPU exits the wait mode and
resumes processing, beginning with the stacking operations leading to the interrupt service routine.
While the MCU is in wait mode, there are some restrictions on which background debug commands can
be used. Only the BACKGROUND command and memory-access-with-status commands are available
when the MCU is in wait mode. The memory-access-with-status commands do not allow memory access,
but they report an error indicating that the MCU is in either stop or wait mode. The BACKGROUND
command can be used to wake the MCU from wait mode and enter active background mode.
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 35MC9S08GB/GT
3.6 Stop Modes
One of three stop modes is entered upon execution of a STOP instruction when the STOPE bit in the
system option register is set. In all stop modes, all internal clocks are halted. If the STOPE bit is not set
when the CPU executes a STOP instruction, the MCU will not enter any of the stop modes and an illegal
opcode reset is forced. The stop modes are selected by setting the appropriate bits in SPMSC2.
Table 3-1 summarizes the behavior of the MCU in each of the stop modes.
3.6.1 Stop1 Mode
The stop1 mode provides the lowest possible standby power consumption by causing the internal circuitry
of the MCU to be powered down. To select entry into stop1 mode upon execution of a STOP instruction,
the user must set the PDC bit in SPMSC2.
When the MCU is in stop1 mode, all internal circuits that are powered from the voltage regulator are
turned off. The voltage regulator is in a low-power standby state, as is the ATD.
Exit from stop1 is done by asserting either of the wake-up pins on the MCU: RESETor IRQ. IRQ is always
an active low input when the MCU is in stop1, regardless of how it was configured before entering stop1.
Entering stop1 mode automatically asserts LVD. Stop1 cannot be exited until VDD >V
LVDH/L rising (VDD
must rise above the LVI rearm voltage).
Upon wake-up from stop1 mode, the MCU will start up as from a power-on reset (POR). The CPU will
take the reset vector. To select entry into stop1 mode upon execution of a STOP instruction, the user must
set the PDC bit in SPMSC2 and clear the PPDC bit in SPMSC2.
3.6.2 Stop2 Mode
The stop2 mode provides very low standby power consumption and maintains the contents of RAM and
the current state of all of the I/O pins. To select entry into stop2 upon execution of a STOP instruction, the
user must execute a STOP instruction while the PPDC and PDC bits in SPMSC2 are set.
Table 3-1 Stop Mode Behavior
Mode PDC PPDC CPU, Digital
Peripherals,
FLASH RAM ICG ATD Regulator I/O Pins RTI
Stop1 1 0 Off Off Off Disabled
(1)
NOTES:
1. Either ATD stop mode or power-down mode depending on the state of ATDPU.
Off Reset Off
Stop2 1 1 Off Standby Off Disabled Standby States
held Optionally on
Stop3 0 Don’t
care Standby Standby Off(2)
2. Crystal oscillator can be configured to run in stop3. Please see the ICG registers.
Disabled Standby States
held Optionally on
Modes of Operation
MC9S08GB/GT36 MOTOROLA
Before entering stop2 mode, the user must save the contents of the I/O port registers, as well as any other
memory-mapped registers which they want to restore after exit of stop2, to locations in RAM. Upon exit
of stop2, these values can be restored by user software before pin latches are opened.
When the MCU is in stop2 mode, all internal circuits that are powered from the voltage regulator are
turned off, except for the RAM. The voltage regulator is in a low-power standby state, as is the ATD. Upon
entry into stop2, the states of the I/O pins are latched. The states are held while in stop2 mode and after
exiting stop2 mode until a logic 1 is written to PPDACK in SPMSC2.
Exit from stop2 is done by asserting either of the wake-up pins: RESET or IRQ, or by an RTI interrupt.
IRQ is always an active low input when the MCU is in stop2, regardless of how it was configured before
entering stop2.
Upon wake-up from stop2 mode, the MCU will start up as from a power-on reset (POR) except pin states
remain latched. The CPU will take the reset vector. The system and all peripherals will be in their default
reset states and must be initialized.
After waking up from stop2, the PPDF bit in SPMSC2 is set. This flag may be used to direct user code to
go to a stop2 recovery routine. PPDF remains set and the I/O pin states remain latched until a logic 1 is
written to PPDACK in SPMSC2.
To maintain I/O state for pins that were configured as general-purpose I/O, the user must restore the
contents of the I/O port registers, which have been saved in RAM, to the port registers before writing to
the PPDACK bit. If the port registers are not restored from RAM before writing to PPDACK, then the
register bits will assume their reset states when the I/O pin latches are opened and the I/O pins will switch
to their reset states.
For pins that were configured as peripheral I/O, the user must reconfigure the peripheral module that
interfaces to the pin before writing to the PPDACK bit. If the peripheral module is not enabled before
writing to PPDACK, the pins will be controlled by their associated port control registers when the I/O
latches are opened.
3.6.3 Stop3 Mode
Upon entering the stop3 mode, all of the clocks in the MCU, including the oscillator itself, are halted. The
ICG enters its standby state, as does the voltage regulator and the ATD. The states of all of the internal
registers and logic, as well as the RAM content, are maintained. The I/O pin states are not latched at the
pin as in stop2. Instead they are maintained by virtue of the states of the internal logic driving the pins
being maintained.
Exit from stop3 is done by asserting RESET, an asynchronous interrupt pin, or through the real-time
interrupt. The asynchronous interrupt pins are the IRQ or KBI pins.
If stop3 is exited by means of the RESET pin, then the MCU will be reset and operation will resume after
taking the reset vector. Exit by means of an asynchronous interrupt or the real-time interrupt will result in
the MCU taking the appropriate interrupt vector.
A separate self-clocked source (≈1 kHz) for the real-time interrupt allows a wakeup from stop2 or stop3
mode with no external components. When RTIS2:RTIS1:RTIS0 = 0:0:0, the real-time interrupt function
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 37MC9S08GB/GT
and this 1-kHz source are disabled. Power consumption is lower when the 1-kHz source is disabled, but
in that case the real-time interrupt cannot wake the MCU from stop.
3.6.4 Active BDM Enabled in Stop Mode
Entry into the active background mode from run mode is enabled if the ENBDM bit in BDCSCR is set.
This register is described in the Development Support section of this data sheet. If ENBDM is set when
the CPU executes a STOP instruction, the system clocks to the background debug logic remain active
when the MCU enters stop mode so background debug communication is still possible. In addition, the
voltage regulator does not enter its low-power standby state but maintains full internal regulation. If the
user attempts to enter either stop1 or stop2 with ENBDM set, the MCU will instead enter stop3.
Most background commands are not available in stop mode. The memory-access-with-status commands
do not allow memory access, but they report an error indicating that the MCU is in either stop or wait
mode. The BACKGROUND command can be used to wake the MCU from stop and enter active
background mode if the ENBDM bit is set. Once in background debug mode, all background commands
are available. The table below summarizes the behavior of the MCU in stop when entry into the
background debug mode is enabled.
3.6.5 LVD Enabled in Stop Mode
The LVD system is capable of generating either an interrupt or a reset when the supply voltage drops
below the LVD voltage. If the LVD is enabled in stop by setting the LVDE and the LVDSE bits in
SPMSC1 when the CPU executes a STOP instruction, then the voltage regulator remains active during
stop mode. If the user attempts to enter either stop1 or stop2 with the LVD enabled for stop (LVDSE = 1),
the MCU will instead enter stop3. The table below summarizes the behavior of the MCU in stop when the
LVD is enabled.
Table 3-2 BDM Enabled Stop Mode Behavior
Mode PDC PPDC CPU, Digital
Peripherals,
FLASH RAM ICG ATD Regulator I/O Pins RTI
Stop3 Don’t
care Don’t
care Standby Standby Active Disabled
(1)
NOTES:
1. Either ATD stop mode or power-down mode depending on the state of ATDPU.
Active States
held Optionally on
Table 3-3 LVD Enabled Stop Mode Behavior
Mode PDC PPDC CPU, Digital
Peripherals,
FLASH RAM ICG ATD Regulator I/O Pins RTI
Stop3 Don’t
care Don’t
care Standby Standby Standby Disabled
(1)
NOTES:
1. Either ATD stop mode or power-down mode depending on the state of ATDPU.
Active States
held Optionally on
Modes of Operation
MC9S08GB/GT38 MOTOROLA
3.6.6 On-Chip Peripheral Modules in Stop Modes
When the MCU enters any stop mode, system clocks to the internal peripheral modules are stopped. Even
in the exception case (ENBDM = 1), where clocks are kept alive to the background debug logic, clocks to
the peripheral systems are halted to reduce power consumption. Refer to 3.6.1 Stop1 Mode,3.6.2 Stop2
Mode, and 3.6.3 Stop3 Mode for specific information on system behavior in stop modes.
I/O Pins
• All I/O pin states remain unchanged when the MCU enters stop3 mode.
• If the MCU is configured to go into stop2 mode, all I/O pins states are latched before entering stop.
• If the MCU is configured to go into stop1 mode, all I/O pins are forced to their default reset state
upon entry into stop.
Memory
• All RAM and register contents are preserved while the MCU is in stop3 mode.
• All registers will be reset upon wake-up from stop2, but the contents of RAM are preserved and pin
states remain latched until the PPDACK bit is written. The user may save any memory-mapped
register data into RAM before entering stop2 and restore the data upon exit from stop2.
• All registers will be reset upon wake-up from stop1 and the contents of RAM are not preserved. The
MCU must be initialized as upon reset. The contents of the FLASH memory are non-volatile and
are preserved in any of the stop modes.
ICG — In stop3 mode, the ICG enters its low-power standby state. Either the oscillator or the internal
reference may be kept running when the ICG is in standby by setting the appropriate control bit. In both
stop2 and stop1 modes, the ICG is turned off. Neither the oscillator nor the internal reference can be kept
running in stop2 or stop1, even if enabled within the ICG module.
TPM — When the MCU enters stop mode, the clock to the TPM1 and TPM2 modules stop. The modules
halt operation. If the MCU is configured to go into stop2 or stop1 mode, the TPM modules will be reset
upon wake-up from stop and must be reinitialized.
ATD — When the MCU enters stop mode, the ATD will enter a low-power standby state.No conversion
operation will occur while in stop. If the MCU is configured to go into stop2 or stop1 mode, the ATD will
be reset upon wake-up from stop and must be reinitialized.
KBI — During stop3, the KBI pins that are enabled continue to function as interrupt sources that are
capable of waking the MCU from stop3. The KBI is disabled in stop1 and stop2 and must be reinitialized
after waking up from either of these modes.
SCI — When the MCU enters stop mode, the clocks to the SCI1 and SCI2 modules stop. The modules
halt operation. If the MCU is configured to go into stop2 or stop1 mode, the SCI modules will be reset
upon wake-up from stop and must be reinitialized.
SPI — When the MCU enters stop mode, the clocks to the SPI module stop. The module halts operation.
If the MCU is configured to go into stop2 or stop1 mode, the SPI module will be reset upon wake-up from
stop and must be reinitialized.
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 39MC9S08GB/GT
IIC — When the MCU enters stop mode, the clocks to the IIC module stops. The module halts operation.
If the MCU is configured to go into stop2 or stop1 mode, the IIC module will be reset upon wake-up from
stop and must be reinitialized.
Voltage Regulator — The voltage regulator enters a low-power standby state when the MCU enters any
of the stop modes unless the LVD is enabled in stop mode or BDM is enabled.
Modes of Operation
MC9S08GB/GT40 MOTOROLA
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 41MC9S08GB/GT
Section 4 Memory
4.1 MC9S08GB/GT Memory Map
As shown in Figure 4-1, on-chip memory in the MC9S08GB/GT series of MCUs consists of RAM,
FLASH program memory for nonvolatile data storage, plus I/O and control/status registers. The registers
are divided into three groups:
• Direct-page registers ($0000 through $007F)
• High-page registers ($1800 through $182B)
• Nonvolatile registers ($FFB0 through $FFBF)
Figure 4-1 MC9S08GB/GT Memory Map
DIRECT PAGE REGISTERS
RAM
FLASH
HIGH PAGE REGISTERS
FLASH
4096 BYTES
1920 BYTES
59348 BYTES
$0000
$007F
$0080
$107F
$1800
$17FF
$182B
$182C
$FFFF
$1080
DIRECT PAGE REGISTERS
RAM
HIGH PAGE REGISTERS
FLASH
32768 BYTES
$0000
$007F
$0080
$087F
$1800
$17FF
$182B
$182C
$FFFF
$0880
2048 BYTES
UNIMPLEMENTED
26580 BYTES
UNIMPLEMENTED
3960 BYTES
$8000
$7FFF
MC9S08GB/GT60 MC9S08GB/GT32
Memory
MC9S08GB/GT42 MOTOROLA
4.1.1 Reset and Interrupt Vector Assignments
Table 4-1 shows address assignments for reset and interrupt vectors. The vector names shown in this table
are the labels used in the Motorola-provided equate file for the MC9S08GB/GT. For more details about
resets, interrupts, interrupt priority, and local interrupt mask controls, refer to the Resets, Interrupts, and
System Configuration section.
Table 4-1 Reset and Interrupt Vectors
Address
(High/Low) Vector Vector Name
$FFC0:FFC1
$FFCA:FFCB
Unused Vector Space
(available for user program)
$FFCC:FFCD RTI Vrti
$FFCE:FFCF IIC Viic
$FFD0:FFD1 ATD Conversion Vatd
$FFD2:FFD3 Keyboard Vkeyboard
$FFD4:FFD5 SCI2 Transmit Vsci2tx
$FFD6:FFD7 SCI2 Receive Vsci2rx
$FFD8:FFD9 SCI2 Error Vsci2err
$FFDA:FFDB SCI1 Transmit Vsci1tx
$FFDC:FFDD SCI1 Receive Vsci1rx
$FFDE:FFDF SCI1 Error Vsci1err
$FFE0:FFE1 SPI Vspi
$FFE2:FFE3 TPM2 Overflow Vtpm2ovf
$FFE4:FFE5 TPM2 Channel 4 Vtpm2ch4
$FFE6:FFE7 TPM2 Channel 3 Vtpm2ch3
$FFE8:FFE9 TPM2 Channel 2 Vtpm2ch2
$FFEA:FFEB TPM2 Channel 1 Vtpm2ch1
$FFEC:FFED TPM2 Channel 0 Vtpm2ch0
$FFEE:FFEF TPM1 Overflow Vtpm1ovf
$FFF0:FFF1 TPM1 Channel 2 Vtpm1ch2
$FFF2:FFF3 TPM1 Channel 1 Vtpm1ch1
$FFF4:FFF5 TPM1 Channel 0 Vtpm1ch0
$FFF6:FFF7 ICG Vicg
$FFF8:FFF9 Low Voltage Detect Vlvd
$FFFA:FFFB IRQ Virq
$FFFC:FFFD SWI Vswi
$FFFE:FFFF Reset Vreset
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 43MC9S08GB/GT
4.2 Register Addresses and Bit Assignments
The registers in the MC9S08GB/GT are divided into these three groups:
• Direct-page registers are located in the first 128 locations in the memory map, so they are accessible
with efficient direct addressing mode instructions.
• High-page registers are used much less often, so they are located above $1800 in the memory map.
This leaves more room in the direct page for more frequently used registers and variables.
• The nonvolatile register area consists of a block of 16 locations in FLASH memory at
$FFB0–$FFBF.
Nonvolatile register locations include:
– Three values which are loaded into working registers at reset
– An 8-byte backdoor comparison key which optionally allows a user to gain controlled access to
secure memory
Since the nonvolatile register locations are FLASH memory, they must be erased and programmed
like other FLASH memory locations.
Direct-page registers can be accessed with efficient direct addressing mode instructions. Bit manipulation
instructions can be used to access any bit in any direct-page register. Table 4-2 is a summary of all
user-accessible direct-page registers and control bits.
The direct page registers in Table 4-2 can use the more efficient direct addressing mode which only
requires the lower byte of the address. Because of this, the lower byte of the address in column one is
shown in bold text. In Table 4-3 and Table 4-4 the whole address in column one is shown in bold. In
Table 4-2,Table 4-3, and Table 4-4, the register names in column two are shown in bold to set them apart
from the bit names to the right. Cells that are not associated with named bits are shaded. A shaded cell with
a 0 indicates this unused bit always reads as a 0. Shaded cells with dashes indicate unused or reserved bit
locations that could read as 1s or 0s.
Memory
MC9S08GB/GT44 MOTOROLA
Table 4-2 Direct-Page Register Summary
Address Register Name Bit 7 654321Bit 0
$0000 PTAD PTAD7 PTAD6 PTAD5 PTAD4 PTAD3 PTAD2 PTAD1 PTAD0
$0001 PTAPE PTAPE7 PTAPE6 PTAPE5 PTAPE4 PTAPE3 PTAPE2 PTAPE1 PTAPE0
$0002 PTASE PTASE7 PTASE6 PTASE5 PTASE4 PTASE3 PTASE2 PTASE1 PTASE0
$0003 PTADD PTADD7 PTADD6 PTADD5 PTADD4 PTADD3 PTADD2 PTADD1 PTADD0
$0004 PTBD PTBD7 PTBD6 PTBD5 PTBD4 PTBD3 PTBD2 PTBD1 PTBD0
$0005 PTBPE PTBPE7 PTBPE6 PTBPE5 PTBPE4 PTBPE3 PTBPE2 PTBPE1 PTBPE0
$0006 PTBSE PTBSE7 PTBSE6 PTBSE5 PTBSE4 PTBSE3 PTBSE2 PTBSE1 PTBSE0
$0007 PTBDD PTBDD7 PTBDD6 PTBDD5 PTBDD4 PTBDD3 PTBDD2 PTBDD1 PTBDD0
$0008 PTCD PTCD7 PTCD6 PTCD5 PTCD4 PTCD3 PTCD2 PTCD1 PTCD0
$0009 PTCPE PTCPE7 PTCPE6 PTCPE5 PTCPE4 PTCPE3 PTCPE2 PTCPE1 PTCPE0
$000A PTCSE PTCSE7 PTCSE6 PTCSE5 PTCSE4 PTCSE3 PTCSE2 PTCSE1 PTCSE0
$000B PTCDD PTCDD7 PTCDD6 PTCDD5 PTCDD4 PTCDD3 PTCDD2 PTCDD1 PTCDD0
$000C PTDD PTDD7 PTDD6 PTDD5 PTDD4 PTDD3 PTDD2 PTDD1 PTDD0
$000D PTDPE PTDPE7 PTDPE6 PTDPE5 PTDPE4 PTDPE3 PTDPE2 PTDPE1 PTDPE0
$000E PTDSE PTDSE7 PTDSE6 PTDSE5 PTDSE4 PTDSE3 PTDSE2 PTDSE1 PTDSE0
$000F PTDDD PTDDD7 PTDDD6 PTDDD5 PTDDD4 PTDDD3 PTDDD2 PTDDD1 PTDDD0
$0010 PTED PTED7 PTED6 PTED5 PTED4 PTED3 PTED2 PTED1 PTED0
$0011 PTEPE PTEPE7 PTEPE6 PTEPE5 PTEPE4 PTEPE3 PTEPE2 PTEPE1 PTEPE0
$0012 PTESE PTESE7 PTESE6 PTESE5 PTESE4 PTESE3 PTESE2 PTESE1 PTESE0
$0013 PTEDD PTEDD7 PTEDD6 PTEDD5 PTEDD4 PTEDD3 PTEDD2 PTEDD1 PTEDD0
$0014 IRQSC 0 0 IRQEDG IRQPE IRQF IRQACK IRQIE IRQMOD
$0015 Reserved — — — — — — — —
$0016 KBISC KBEDG7 KBEDG6 KBEDG5 KBEDG4 KBF KBACK KBIE KBIMOD
$0017 KBIPE KBIPE7 KBIPE6 KBIPE5 KBIPE4 KBIPE3 KBIPE2 KBIPE1 KBIPE0
$0018 SCI1BDH 0 0 0 SBR12 SBR11 SBR10 SBR9 SBR8
$0019 SCI1BDL SBR7 SBR6 SBR5 SBR4 SBR3 SBR2 SBR1 SBR0
$001A SCI1C1 LOOPS SCISWAI RSRC M WAKE ILT PE PT
$001B SCI1C2 TIE TCIE RIE ILIE TE RE RWU SBK
$001C SCI1S1 TDRE TC RDRF IDLE OR NF FE PF
$001D SCI1S2 0000000RAF
$001E SCI1C3 R8 T8 TXDIR 0 ORIE NEIE FEIE PEIE
$001F SCI1D Bit 7 654321Bit 0
$0020 SCI2BDH 0 0 0 SBR12 SBR11 SBR10 SBR9 SBR8
$0021 SCI2BDL SBR7 SBR6 SBR5 SBR4 SBR3 SBR2 SBR1 SBR0
$0022 SCI2C1 LOOPS SCISWAI RSRC M WAKE ILT PE PT
$0023 SCI2C2 TIE TCIE RIE ILIE TE RE RWU SBK
$0024 SCI2S1 TDRE TC RDRF IDLE OR NF FE PF
$0025 SCI2S2 0000000RAF
$0026 SCI2C3 R8 T8 TXDIR 0 ORIE NEIE FEIE PEIE
$0027 SCI2D Bit 7 654321Bit 0
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 45MC9S08GB/GT
$0028 SPIC1 SPIE SPE SPTIE MSTR CPOL CPHA SSOE LSBFE
$0029 SPIC2 0 0 0 MODFEN BIDIROE 0 SPISWAI SPC0
$002A SPIBR 0 SPPR2 SPPR1 SPPR0 0 SPR2 SPR1 SPR0
$002B SPIS SPRF 0 SPTEF MODF 0 0 0 0
$002C Reserved 0 0 0 0 0 0 0 0
$002D SPID Bit 7 654321Bit 0
$002E Reserved 0 0 0 0 0 0 0 0
$002F Reserved 0 0 0 0 0 0 0 0
$0030 TPM1SC TOF TOIE CPWMS CLKSB CLKSA PS2 PS1 PS0
$0031 TPM1CNTH Bit 15 14 13 12 11 10 9 Bit 8
$0032 TPM1CNTL Bit 7 654321Bit 0
$0033 TPM1MODH Bit 15 14 13 12 11 10 9 Bit 8
$0034 TPM1MODL Bit 7 654321Bit 0
$0035 TPM1C0SC CH0F CH0IE MS0B MS0A ELS0B ELS0A 0 0
$0036 TPM1C0VH Bit 15 14 13 12 11 10 9 Bit 8
$0037 TPM1C0VL Bit 7 654321Bit 0
$0038 TPM1C1SC CH1F CH1IE MS1B MS1A ELS1B ELS1A 0 0
$0039 TPM1C1VH Bit 15 14 13 12 11 10 9 Bit 8
$003A TPM1C1VL Bit 7 654321Bit 0
$003B TPM1C2SC CH2F CH2IE MS2B MS2A ELS2B ELS2A 0 0
$003C TPM1C2VH Bit 15 14 13 12 11 10 9 Bit 8
$003D TPM1C2VL Bit 7 654321Bit 0
$003E–
$003F Reserved —
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
$0040 PTFD PTFD7 PTFD6 PTFD5 PTFD4 PTFD3 PTFD2 PTFD1 PTFD0
$0041 PTFPE PTFPE7 PTFPE6 PTFPE5 PTFPE4 PTFPE3 PTFPE2 PTFPE1 PTFPE0
$0042 PTFSE PTFSE7 PTFSE6 PTFSE5 PTFSE4 PTFSE3 PTFSE2 PTFSE1 PTFSE0
$0043 PTFDD PTFDD7 PTFDD6 PTFDD5 PTFDD4 PTFDD3 PTFDD2 PTFDD1 PTFDD0
$0044 PTGD PTGD7 PTGD6 PTGD5 PTGD4 PTGD3 PTGD2 PTGD1 PTGD0
$0045 PTGPE PTGPE7 PTGPE6 PTGPE5 PTGPE4 PTGPE3 PTGPE2 PTGPE1 PTGPE0
$0046 PTGSE PTGSE7 PTGSE6 PTGSE5 PTGSE4 PTGSE3 PTGSE2 PTGSE1 PTGSE0
$0047 PTGDD PTGDD7 PTGDD6 PTGDD5 PTGDD4 PTGDD3 PTGDD2 PTGDD1 PTGDD0
$0048 ICGC1 0 RANGE REFS CLKS OSCSTEN 0* 0
$0049 ICGC2 LOLRE MFD LOCRE RFD
$004A ICGS1 CLKST REFST LOLS LOCK LOCS ERCS ICGIF
$004B ICGS2 0000000DCOS
$004C ICGFLTU 0 0 0 0 FLT
$004D ICGFLTL FLT
$004E ICGTRM TRIM
$004F Reserved 0 0 0 0 0 0 0 0
* This bit is reserved for Motorola internal use only. Always write a 0 to this bit.
Table 4-2 Direct-Page Register Summary (Continued)
Address Register Name Bit 7 654321Bit 0
Memory
MC9S08GB/GT46 MOTOROLA
$0050 ATDC ATDPU DJM RES8 SGN PRS
$0051 ATDSC CCF ATDIE ATDCO ATDCH
$0052 ATDRH Bit 7 654321Bit 0
$0053 ATDRL Bit 7 654321Bit 0
$0054 ATDPE ATDPE7 ATDPE6 ATDPE5 ATDPE4 ATDPE3 ATDPE2 ATDPE1 ATDPE0
$0055–
$0057 Reserved —
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
$0058 IICA ADDR 0
$0059 IICF MULT ICR
$005A IICC IICEN IICIE MST TX TXAK RSTA 0 0
$005B IICS TCF IAAS BUSY ARBL 0 SRW IICIF RXAK
$005C IICD DATA
$005D–
$005F Reserved —
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
$0060 TPM2SC TOF TOIE CPWMS CLKSB CLKSA PS2 PS1 PS0
$0061 TPM2CNTH Bit 15 14 13 12 11 10 9 Bit 8
$0062 TPM2CNTL Bit 7 654321Bit 0
$0063 TPM2MODH Bit 15 14 13 12 11 10 9 Bit 8
$0064 TPM2MODL Bit 7 654321Bit 0
$0065 TPM2C0SC CH0F CH0IE MS0B MS0A ELS0B ELS0A 0 0
$0066 TPM2C0VH Bit 15 14 13 12 11 10 9 Bit 8
$0067 TPM2C0VL Bit 7 654321Bit 0
$0068 TPM2C1SC CH1F CH1IE MS1B MS1A ELS1B ELS1A 0 0
$0069 TPM2C1VH Bit 15 14 13 12 11 10 9 Bit 8
$006A TPM2C1VL Bit 7 654321Bit 0
$006B TPM2C2SC CH2F CH2IE MS2B MS2A ELS2B ELS2A 0 0
$006C TPM2C2VH Bit 15 14 13 12 11 10 9 Bit 8
$006D TPM2C2VL Bit 7 654321Bit 0
$006E TPM2C3SC CH3F CH3IE MS3B MS3A ELS3B ELS3A 0 0
$006F TPM2C3VH Bit 15 14 13 12 11 10 9 Bit 8
$0070 TPM2C3VL Bit 7 654321Bit 0
$0071 TPM2C4SC CH4F CH4IE MS4B MS4A ELS4B ELS4A 0 0
$0072 TPM2C4VH Bit 15 14 13 12 11 10 9 Bit 8
$0073 TPM2C4VL Bit 7 654321Bit 0
$0074–
$007F Reserved —
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Table 4-2 Direct-Page Register Summary (Continued)
Address Register Name Bit 7 654321Bit 0
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 47MC9S08GB/GT
High-page registers, shown in Table 4-3, are accessed much less often than other I/O and control registers
so they have been located outside the direct addressable memory space, starting at $1800.
Table 4-3 High-Page Register Summary
Address Register Name Bit 7 654321Bit 0
$1800 SRS POR PIN COP ILOP 0 ICG LVD 0
$1801 SBDFR 0000000BDFR
$1802 SOPT COPE COPT STOPE — 0 0 BKGDPE —
$1803 –
$1805 Reserved —
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
$1806 SDIDH REV3 REV2 REV1 REV0 ID11 ID10 ID9 ID8
$1807 SDIDL ID7 ID6 ID5 ID4 ID3 ID2 ID1 ID0
$1808 SRTISC RTIF RTIACK RTICLKS RTIE 0 RTIS2 RTIS1 RTIS0
$1809 SPMSC1 LVDF LVDACK LVDIE LVDRE LVDSE LVDE 0 0
$180A SPMSC2 LVWF LVWACK LVDV LVWV PPDF PPDACK PDC PPDC
$180B–
$180F Reserved —
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
$1810 DBGCAH Bit 15 14 13 12 11 10 9 Bit 8
$1811 DBGCAL Bit 7 654321Bit 0
$1812 DBGCBH Bit 15 14 13 12 11 10 9 Bit 8
$1813 DBGCBL Bit 7 654321Bit 0
$1814 DBGFH Bit 15 14 13 12 11 10 9 Bit 8
$1815 DBGFL Bit 7 654321Bit 0
$1816 DBGC DBGEN ARM TAG BRKEN RWA RWAEN RWB RWBEN
$1817 DBGT TRGSEL BEGIN 0 0 TRG3 TRG2 TRG1 TRG0
$1818 DBGS AF BF ARMF 0 CNT3 CNT2 CNT1 CNT0
$1819–
$181F Reserved —
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
$1820 FCDIV DIVLD PRDIV8 DIV5 DIV4 DIV3 DIV2 DIV1 DIV0
$1821 FOPT KEYEN FNORED 0 0 0 0 SEC01 SEC00
$1822 Reserved — — — — — — — —
$1823 FCNFG 0 0 KEYACC 0 0 0 0 0
$1824 FPROT FPOPEN FPDIS FPS2 FPS1 FPS0 0 0 0
$1825 FSTAT FCBEF FCCF FPVIOL FACCERR 0 FBLANK 0 0
$1826 FCMD FCMD7 FCMD6 FCMD5 FCMD4 FCMD3 FCMD2 FCMD1 FCMD0
$1827–
$182B Reserved —
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Memory
MC9S08GB/GT48 MOTOROLA
Nonvolatile FLASH registers, shown in Table 4-4, are located in the FLASH memory. These registers
include an 8-byte backdoor key which optionally can be used to gain access to secure memory resources.
During reset events, the contents of NVPROT and NVOPT in the nonvolatile register area of the FLASH
memory are transferred into corresponding FPROT and FOPT working registers in the high-page registers
to control security and block protection options.
Provided the key enable (KEYEN) bit is 1, the 8-byte comparison key can be used to temporarily
disengage memory security. This key mechanism can be accessed only through user code running in
secure memory. (A security key cannot be entered directly through background debug commands.) This
security key can be disabled completely by programming the KEYEN bit to 0. If the security key is
disabled, the only way to disengage security is by mass erasing the FLASH if needed (normally through
the background debug interface) and verifying that FLASH is blank. To avoid returning to secure mode
after the next reset, program the security bits (SEC01:SEC00) to the unsecured state (1:0).
4.3 RAM
The MC9S08GB/GT includes static RAM. The locations in RAM below $0100 can be accessed using the
more efficient direct addressing mode, and any single bit in this area can be accessed with the bit
manipulation instructions (BCLR, BSET, BRCLR, and BRSET). Locating the most frequently accessed
program variables in this area of RAM is preferred.
The RAM retains data when the MCU is in low-power wait, stop2, or stop3 mode. At power-on or after
wakeup from stop1, the contents of RAM are uninitialized. RAM data is unaffected by any reset provided
that the supply voltage does not drop below the minimum value for RAM retention.
For compatibility with older M68HC05 MCUs, the HCS08 resets the stack pointer to $00FF. In the
MC9S08GB/GT, it is usually best to reinitialize the stack pointer to the top of the RAM so the direct page
RAM can be used for frequently accessed RAM variables and bit-addressable program variables. Include
the following 2-instruction sequence in your reset initialization routine (where RamLast is equated to the
highest address of the RAM in the Motorola-provided equate file).
LDHX #RamLast+1 ;point one past RAM
TXS ;SP<-(H:X-1)
Table 4-4 Nonvolatile Register Summary
Address Register Name Bit 7 654321Bit 0
$FFB0 –
$FFB7
NVBACKKEY 8-Byte Comparison Key
$FFB8 –
$FFBC
Reserved —
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
$FFBD NVPROT FPOPEN FPDIS FPS2 FPS1 FPS0 0 0 0
$FFBE Reserved(1)
NOTES:
1. This location can be used to store the factory trim value for the ICG.
————————
$FFBF NVOPT KEYEN FNORED 0 0 0 0 SEC01 SEC00
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 49MC9S08GB/GT
When security is enabled, the RAM is considered a secure memory resource and is not accessible through
BDM or through code executing from non-secure memory. See section 4.5 Security for a detailed
description of the security feature.
4.4 FLASH
The FLASH memory is intended primarily for program storage. In-circuit programming allows the
operating program to be loaded into the FLASH memory after final assembly of the application product.
It is possible to program the entire array through the single-wire background debug interface. Because no
special voltages are needed for FLASH erase and programming operations, in-application programming
is also possible through other software-controlled communication paths. For a more detailed discussion of
in-circuit and in-application programming, refer to the HCS08 Family Reference Manual, Volume I,
Motorola document order number HCS08RMv1/D.
4.4.1 Features
Features of the FLASH memory include:
• FLASH Size
– MC9S08GB/GT60 — 61268 bytes (120 pages of 512 bytes each)
– MC9S08GB/GT32 — 32768 bytes (64 pages of 512 bytes each)
• Single power supply program and erase
• Command interface for fast program and erase operation
• Up to 100,000 program/erase cycles at typical voltage and temperature
• Flexible block protection
• Security feature for FLASH and RAM
• Auto power-down for low-frequency read accesses
4.4.2 Program and Erase Times
Before any program or erase command can be accepted, the FLASH clock divider register (FCDIV) must
be written to set the internal clock for the FLASH module to a frequency (fFCLK) between 150 kHz and
200 kHz (see 4.6.1 FLASH Clock Divider Register (FCDIV)). This register can be written only once, so
normally this write is done during reset initialization. FCDIV cannot be written if the access error flag,
FACCERR in FSTAT, is set. The user must ensure that FACCERR is not set before writing to the FCDIV
register. One period of the resulting clock (1/fFCLK) is used by the command processor to time program
anderase pulses. Aninteger number of these timingpulses are usedby the commandprocessor to complete
a program or erase command.
Memory
MC9S08GB/GT50 MOTOROLA
Table 4-5 shows program and erase times. The bus clock frequency and FCDIV determine the frequency
of FCLK (fFCLK). The time for one cycle of FCLK is tFCLK = 1/fFCLK. The times are shown as a number
of cycles of FCLK and as an absolute time for the case where tFCLK =5µs. Program and erase times
shown include overhead for the command state machine and enabling and disabling of program and erase
voltages.
4.4.3 Program and Erase Command Execution
The steps for executing any of the commands are listed below. The FCDIV register must be initialized and
any error flags cleared before beginning command execution. The command execution steps are:
1. Write a data value to an address in the FLASH array. The address and data information from this
write is latched into the FLASH interface. This write is a required first step in any command
sequence. For erase and blank check commands, the value of the data is not important. For page
erase commands, the address may be any address in the 512-byte page of FLASH to be erased. For
mass erase and blank check commands, the address can be any address in the FLASH memory.
Whole pages of 512 bytes are the smallest block of FLASH that may be erased. In the 60K version,
there are two instances where the size of a block that is accessible to the user is less than 512 bytes:
the first page following RAM, and the first page following the high page registers. These pages are
overlapped by the RAM and high page registers respectively.
2. Write the command code for the desired command to FCMD. The five valid commands are blank
check ($05), byte program ($20), burst program ($25), page erase ($40), and mass erase ($41). The
command code is latched into the command buffer.
3. Write a 1 to the FCBEF bit in FSTAT to clear FCBEF and launch the command (including its
address and data information).
A partial command sequence can be aborted manually by writing a 0 to FCBEF any time after the write to
the memory array and before writing the 1 that clears FCBEF and launches the complete command.
Aborting a command in this way sets the FACCERR access error flag which must be cleared before
starting a new command.
Table 4-5 Program and Erase Times
Parameter Cycles of FCLK Time if FCLK = 200 kHz
Byte program 9 45 µs
Byte program (burst) 4 20 µs(1)
NOTES:
1. Excluding start/end overhead
Page erase 4000 20 ms
Mass erase 20,000 100 ms
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 51MC9S08GB/GT
A strictly monitored procedure must be followed or the command will not be accepted. This minimizes
the possibility of any unintended changes to the FLASH memory contents. The command complete flag
(FCCF) indicates when a command is complete. The command sequence must be completed by clearing
FCBEF to launch the command. Figure 4-2 below is a flowchart for executing all of the commands except
for burst programming. The FCDIV register must be initialized before using any FLASH commands. This
only must be done once following a reset.
Figure 4-2 FLASH Program and Erase Flowchart
START
WRITE TO FLASH
TO BUFFER ADDRESS AND DATA
WRITE COMMAND TO FCMD
NO
YES
FPVIO OR
WRITE 1 TO FCBEF
TO LAUNCH COMMAND
AND CLEAR FCBEF (2)
1
0
FCCF ?
ERROR EXIT
DONE
(2) Wait at least four bus cycles before
checking FCBEF or FCCF.
0
FACCERR ?
CLEAR ERROR
FACCERR ?
WRITE TO FCDIV(1) (1) Only required once
after reset.
Memory
MC9S08GB/GT52 MOTOROLA
4.4.4 Burst Program Execution
The burst program command is used to program sequential bytes of data in less time than would be
required using the standard program command. This is possible because the high voltage to the FLASH
array does not need to be disabled between program operations. Ordinarily, when a program or erase
command is issued, an internal charge pump associated with the FLASH memory must be enabled to
supply high voltage to the array. Upon completion of the command, the charge pump is turned off. When
a burst program command is issued, the charge pump is enabled and then remains enabled after completion
of the burst program operation if the following two conditions are met:
1. The next burst program command has been queued before the current program operation has
completed.
2. The next sequential address selects a byte on the same physical row as the current byte being
programmed. A row of FLASH memory consists of 64 bytes. A byte within a row is selected by
addresses A5 through A0. A new row begins when addresses A5 through A0 are all zero.
The first byte of a series of sequential bytes being programmed in burst mode will take the same amount
of time to program as a byte programmed in standard mode. Subsequent bytes will program in the burst
program time provided that the conditions above are met. In the case the next sequential address is the
beginning of a new row, the program time for that byte will be the standard time instead of the burst time.
This is because the high voltage to the array must be disabled and then enabled again. If a new burst
command has not been queued before the current command completes, then the charge pump will be
disabled and high voltage removed from the array.
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 53MC9S08GB/GT
Figure 4-3 FLASH Burst Program Flowchart
1
0
FCBEF ?
START
WRITE TO FLASH
TO BUFFER ADDRESS AND DATA
WRITE COMMAND TO FCMD
NO
YES
FPVIO OR
WRITE 1 TO FCBEF
TO LAUNCH COMMAND
AND CLEAR FCBEF (2)
NO
YES
NEW BURST COMMAND ?
1
0
FCCF ?
ERROR EXIT
DONE
(2) Wait at least four bus cycles before
checking FCBEF or FCCF.
1
0
FACCERR ?
CLEAR ERROR
FACCERR ?
WRITE TO FCDIV(1) (1) Only required once
after reset.
Memory
MC9S08GB/GT54 MOTOROLA
4.4.5 Access Errors
An access error occurs whenever the command execution protocol is violated.
Any of the following specific actions will cause the access error flag (FACCERR) in FSTAT to be set.
FACCERR must be cleared by writing a 1 to FACCERR in FSTAT before any command can be
processed.
• Writing to a FLASH address before the internal FLASH clock frequency has been set by writing to
the FCDIV register
• Writing to a FLASH address while FCBEF is not set (A new command cannot be started until the
command buffer is empty.)
• Writing a second time to a FLASH address before launching the previous command (There is only
one write to FLASH for every command.)
• Writing a second time to FCMD before launching the previous command (There is only one write
to FCMD for every command.)
• Writing to any FLASH control register other than FCMD after writing to a FLASH address
• Writing any command code other than the five allowed codes ($05, $20, $25, $40, or $41) to FCMD
• Accessing (read or write) any FLASH control register other than the write to FSTAT (to clear
FCBEF and launch the command) after writing the command to FCMD.
• The MCU enters stop mode while a program or erase command is in progress (The command is
aborted.)
• Writing the byte program, burst program, or page erase command code ($20, $25, or $40) with a
background debug command while the MCU is secured (The background debug controller can only
do blank check and mass erase commands when the MCU is secure.)
• Writing 0 to FCBEF to cancel a partial command
4.4.6 FLASH Block Protection
Block protection prevents program or erase changes for FLASH memory locations in a designated address
range. Mass erase is disabled when any block of FLASH is protected. The MC9S08GB/GT allows a block
of memory at the end of FLASH, and/or the entire FLASH memory to be block protected. A disable
control bit and a 3-bit control field, allows the user to set the size of this block. A separate control bit allows
block protection of the entire FLASH memory array. All seven of these control bits are located in the
FPROT register (see 4.6.4 FLASH Protection Register (FPROT and NVPROT)).
At reset, the high-page register (FPROT) is loaded with the contents of the NVPROT location which is in
the nonvolatile register block of the FLASH memory. The value in FPROT cannot be changed directly
from application software so a runaway program cannot alter the block protection settings. If the last 512
bytes of FLASH which includes the NVPROT register is protected, the application program cannot alter
the block protection settings (intentionally or unintentionally). The FPROT control bits can be written by
background debug commands to allow a way to erase a protected FLASH memory.
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 55MC9S08GB/GT
One use for block protection is to block protect an area of FLASH memory for a bootloader program. This
bootloader program then can be used to erase the rest of the FLASH memory and reprogram it. Since the
bootloader is protected, it remains intact even if MCU power is lost in the middle of an erase and
reprogram operation.
4.4.7 Vector Redirection
Whenever any block protection is enabled, the reset and interrupt vectors will be protected. Vector
redirection allows users to modify interrupt vector information without unprotecting bootloader and reset
vector space. Vector redirection is enabled by programming the FNORED bit in the NVOPT register
located at address $FFBF to zero. For redirection to occur, at least some portion but not all of the FLASH
memory must be block protected by programming the NVPROT register located at address $FFBD. All
of the interrupt vectors (memory locations $FFC0–$FFFD) are redirected, while the reset vector
($FFFE:FFFF) is not.
For example, if 512 bytes of FLASH are protected, the protected address region is from $FE00 through
$FFFF. The interrupt vectors ($FFC0–$FFFD) are redirected to the locations $FDC0–$FDFD. Now, if an
SPI interrupt is taken for instance, the values in the locations $FDE0:FDE1 are used for the vector instead
of the values in the locations $FFE0:FFE1. This allows the user to reprogram the unprotected portion of
the FLASH with new program code including new interrupt vector values while leaving the protected area,
which includes the default vector locations, unchanged.
4.5 Security
The MC9S08GB/GT includes circuitry to prevent unauthorized access to the contents of FLASH and
RAM memory. When security is engaged, FLASH and RAM are considered secure resources. Direct-page
registers, high-page registers, and the background debug controller are considered unsecured resources.
Programs executing within secure memory have normal access to any MCU memory locations and
resources. Attempts to access a secure memory location with a program executing from an unsecured
memory space or through the background debug interface are blocked (writes are ignored and reads return
all 0s).
Security is engaged or disengaged based on the state of two nonvolatile register bits (SEC01:SEC00) in
the FOPT register. During reset, the contents of the nonvolatile location NVOPT are copied from FLASH
into the working FOPT register in high-page register space. A user engages security by programming the
NVOPT location which can be done at the same time the FLASH memory is programmed. The 1:0 state
disengages security while the other three combinations engage security. Notice the erased state (1:1)
makes the MCU secure. During development, whenever the FLASH is erased, it is good practice to
immediately program the SEC00 bit to 0 in NVOPT so SEC01:SEC00 = 1:0. This would allow the MCU
to remain unsecured after a subsequent reset.
The on-chip debug module cannot be enabled while the MCU is secure. The separate background debug
controller can still be used for background memory access commands, but the MCU cannot enter active
background mode except by holding BKGD/MS low at the rising edge of reset.
A user can choose to allow or disallow a security unlocking mechanism through an 8-byte backdoor
security key. If the nonvolatile KEYEN bit in NVOPT/FOPT is 0, the backdoor key is disabled and there
Memory
MC9S08GB/GT56 MOTOROLA
is no way to disengage security without completely erasing all FLASH locations. If KEYEN is 1, a secure
user program can temporarily disengage security by:
1. Writing 1 to KEYACC in the FCNFG register. This makes the FLASH module interpret writes to
the backdoor comparison key locations (NVBACKKEY through NVBACKKEY+7) as values to
be compared against the key rather than as the first step in a FLASH program or erase command.
2. Writing the user-entered key values to the NVBACKKEY through NVBACKKEY+7 locations.
These writes must be done in order starting with the value for NVBACKKEY and ending with
NVBACKKEY+7. STHX should not be used for these writes because these writes cannot be done
on adjacent bus cycles. User software normally would get the key codes from outside the MCU
system through a communication interface such as a serial I/O.
3. Writing 0 to KEYACC in the FCNFG register. If the 8-byte key that was just written matches the
key stored in the FLASH locations, SEC01:SEC00 are automatically changed to 1:0 and security
will be disengaged until the next reset.
The security key can be written only from a secure memory, so it cannot be entered through background
commands without the cooperation of a secure user program.
The backdoor comparison key (NVBACKKEY through NVBACKKEY+7) is located in FLASH memory
locations in the nonvolatile register space so users can program these locations just as they would program
any other FLASH memory location. The nonvolatile registers are in the same 512-byte block of FLASH
as the reset and interrupt vectors, so block protecting that space also block protects the backdoor
comparison key. Block protects cannot be changed from user application programs, so if the vector space
is block protected, the backdoor security key mechanism cannot permanently change the block protect,
security settings, or the backdoor key.
Security can always be disengaged through the background debug interface by following these steps:
1. Disable any block protections by writing FPROT. FPROT can be written only with background
debug commands, not from application software.
2. Mass erase FLASH if necessary.
3. Blank check FLASH. Provided FLASH is completely erased, security is disengaged until the next
reset.
To avoid returning to secure mode after the next reset, program NVOPT so SEC01:SEC00 = 1:0.
4.6 FLASH Registers and Control Bits
The FLASH module has nine 8-bit registers in the high-page register space, three locations in the
nonvolatile register space in FLASH memory which are copied into three corresponding high-page control
registers at reset. There is also an 8-byte comparison key in FLASH memory. Refer to Table 4-3 and
Table 4-4 for the absolute address assignments for all FLASH registers. This section refers to registers
and control bits only by their names. A Motorola-provided equate or header file normally is used to
translate these names into the appropriate absolute addresses.
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 57MC9S08GB/GT
4.6.1 FLASH Clock Divider Register (FCDIV)
Bit 7 of this register is a read-only status flag. Bits 6 through 0 may be read at any time but can be written
only one time. Before any erase or programming operations are possible, write to this register to set the
frequency of the clock for the nonvolatile memory system within acceptable limits.
DIVLD — Divisor Loaded Status Flag
When set, this read-only status flag indicates that the FCDIV register has been written since reset.
Reset clears this bit and the first write to this register causes this bit to become set regardless of the
data written.
1 = FCDIV has been written since reset; erase and program operations enabled for FLASH.
0 = FCDIV has not been written since reset; erase and program operations disabled for FLASH.
PRDIV8 — Prescale (Divide) FLASH Clock by 8
1 = Clock input to the FLASH clock divider is the bus rate clock divided by 8.
0 = Clock input to the FLASH clock divider is the bus rate clock.
DIV5:DIV0 — Divisor for FLASH Clock Divider
The FLASH clock divider divides the bus rate clock (or the bus rate clock divided by 8 if PRDIV8 = 1)
by the value in the 6-bit DIV5:DIV0 field plus one. The resulting frequency of the internal FLASH
clock must fall within the range of 200 kHz to 150 kHz for proper FLASH operations. Program/Erase
timing pulses are one cycle of this internal FLASH clock which corresponds to a range of 5 µs to
6.7 µs. The automated programming logic uses an integer number of these pulses to complete an erase
or program operation.
Equation 1 if PRDIV8 = 0 — fFCLK = fBus ÷ ([DIV5:DIV0] + 1)
Equation 2 if PRDIV8 = 1 — fFCLK = fBus ÷ (8 × ([DIV5:DIV0] + 1))
Table 4-6 shows the appropriate values for PRDIV8 and DIV5:DIV0 for selected bus frequencies.
Bit 7 6 54321Bit 0
Read: DIVLD
PRDIV8 DIV5 DIV4 DIV3 DIV2 DIV1 DIV0
Write:
Reset: 0 0 000000
= Unimplemented or Reserved
Figure 4-4 FLASH Clock Divider Register (FCDIV)
Memory
MC9S08GB/GT58 MOTOROLA
4.6.2 FLASH Options Register (FOPT and NVOPT)
During reset, the contents of the nonvolatile location NVOPT are copied from FLASH into FOPT. Bits 5
through2 are not used and always read0. This register may be read atany time, but writeshave no meaning
or effect. To change the value in this register, erase and reprogram the NVOPT location in FLASH
memory as usual and then issue a new MCU reset.
KEYEN — Backdoor Key Mechanism Enable
When this bit is 0, the backdoor key mechanism cannot be used to disengage security. The backdoor
key mechanism is accessible only from user (secured) firmware. BDM commands cannot be used to
write key comparison values that would unlock the backdoor key. For more detailed information about
the backdoor key mechanism, refer to 4.5 Security.
1 = If user firmware writes an 8-byte value that matches the nonvolatile backdoor key
(NVBACKKEY through NVBACKKEY+7 in that order), security is temporarily disengaged
until the next MCU reset.
0 = No backdoor key access allowed.
FNORED — Vector Redirection Disable
When this bit is 1, then vector redirection is disabled.
1 = Vector redirection disabled.
0 = Vector redirection enabled.
Table 4-6 FLASH Clock Divider Settings
fBus PRDIV8
(Binary) DIV5:DIV0
(Decimal) fFCLK Program/Erase Timing Pulse
(5 µs Min, 6.7 µs Max)
20 MHz 1 12 192.3 kHz 5.2 µs
10 MHz 0 49 200 kHz 5 µs
8 MHz 0 39 200 kHz 5 µs
4 MHz 0 19 200 kHz 5 µs
2 MHz 0 9 200 kHz 5 µs
1 MHz 0 4 200 kHz 5 µs
200 kHz 0 0 200 kHz 5 µs
150 kHz 0 0 150 kHz 6.7 µs
Bit 7 6 54321Bit 0
Read: KEYEN FNORED 0000SEC01 SEC00
Write:
Reset: This register is loaded from nonvolatile location NVOPT during reset.
= Unimplemented or Reserved
Figure 4-5 FLASH Options Register (FOPT)
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 59MC9S08GB/GT
SEC01:SEC00 — Security State Code
This 2-bit field determines the security state of the MCU as shown in Table 4-7. When the MCU is
secure, the contents of RAM and FLASH memory cannot be accessed by instructions from any
unsecured source including the background debug interface. For more detailed information about
security, refer to 4.5 Security.
SEC01:SEC00 changes to 1:0 after successful backdoor key entry or a successful blank check of FLASH.
4.6.3 FLASH Configuration Register (FCNFG)
Bits 7 through 5 may be read or written at any time. Bits 4 through 0 always read 0 and cannot be written.
KEYACC — Enable Writing of Access Key
This bit enables writing of the backdoor comparison key. For more detailed information about the
backdoor key mechanism, refer to 4.5 Security.
1 = Writes to NVBACKKEY ($FFB0–$FFB7) are interpreted as comparison key writes.
0 = Writes to $FFB0–$FFB7 are interpreted as the start of a FLASH programming or erase
command.
4.6.4 FLASH Protection Register (FPROT and NVPROT)
During reset, the contents of the nonvolatile location NVPROT is copied from FLASH into FPROT. Bits
0, 1, and 2 are not used and each always reads as 0. This register may be read at any time, but user program
writes have no meaning or effect. Background debug commands can write to FPROT.
Table 4-7 Security States
SEC01:SEC00 Description
0:0 secure
0:1 secure
1:0 unsecured
1:1 secure
Bit 7 6 54321Bit 0
Read: 0 0
KEYACC
00000
Write:
Reset: 0 0 000000
= Unimplemented or Reserved
Figure 4-6 FLASH Configuration Register (FCNFG)
Memory
MC9S08GB/GT60 MOTOROLA
Figure 4-7 FLASH Protection Register (FPROT)
FPOPEN — Open Unprotected FLASH for Program/Erase
1 = Any FLASH location, not otherwise block protected or secured, may be erased or programmed.
0 = Entire FLASH memory is block protected (no program or erase allowed).
FPDIS — FLASH Protection Disable
1 = No FLASH block is protected.
0 = FLASH block specified by FPS2:FPS0 is block protected (program and erase not allowed).
FPS2:FPS1:FPS0 — FLASH Protect Size Selects
When FPDIS = 0, this 3-bit field determines the size of a protected block of FLASH locations at the
high address end of the FLASH (see Table 4-8). Protected FLASH locations cannot be erased or
programmed.
Bit 7 6 54321Bit 0
Read: FPOPEN FPDIS FPS2 FPS1 FPS0 0 0 0
Write: (1)
NOTES:
1. Background commands can be used to change the contents of these bits in FPROT.
(1) (1) (1) (1)
Reset: This register is loaded from nonvolatile location NVPROT during reset.
= Unimplemented or Reserved
Table 4-8 High Address Protected Block
FPS2:FPS1:FPS0 Protected Address Range Protected Block Size Redirected Vectors(1)
NOTES:
1. No redirection if FPOPEN = 0, or FNORED = 1.
0:0:0 $FE00–$FFFF 512 bytes $FDC0–$FDFD(2)
2. Reset vector is not redirected.
0:0:1 $FC00–$FFFF 1 Kbytes $FBC0–$FBFD
0:1:0 $F800–$FFFF 2 Kbytes $F7C0–$F7FD
0:1:1 $F000–$FFFF 4 Kbytes $EFC0–$EFFD
1:0:0 $E000 - $FFFF 8 Kbytes $DFC0–$DFFD
1:0:1 $C000 - $FFFF 16 Kbytes $BFC0–$BFFD
1:1:0 $8000 - $FFFF 32 Kbytes $7FC0–$7FFD
1:1:1 $8000 - $FFFF 32 Kbytes $7FC0–$7FFD
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 61MC9S08GB/GT
4.6.5 FLASH Status Register (FSTAT)
Bits 3, 1, and 0 always read 0 and writes have no meaning or effect. The remaining five bits are status bits
that can be read at any time. Writes to these bits have special meanings that are discussed in the bit
descriptions.
Figure 4-8 FLASH Status Register (FSTAT)
FCBEF — FLASH Command Buffer Empty Flag
The FCBEF bit is used to launch commands. It also indicates that the command buffer is empty so that
a new command sequence can be executed when performing burst programming. The FCBEF bit is
cleared by writing a one to it or when a burst program command is transferred to the array for
programming. Only burst program commands can be buffered.
1 = A new burst program command may be written to the command buffer.
0 = Command buffer is full (not ready for additional commands).
FCCF — FLASH Command Complete Flag
FCCF is set automatically when the command buffer is empty and no command is being processed.
FCCF is cleared automatically when a new command is started (by writing 1 to FCBEF to register a
command). Writing to FCCF has no meaning or effect.
1 = All commands complete
0 = Command in progress
FPVIOL — Protection Violation Flag
FPVIOL is set automatically when FCBEF is cleared to register a command that attempts to erase or
program a location in a protected block (the erroneous command is ignored). FPVIOL is cleared by
writing a 1 to FPVIOL.
1 = An attempt was made to erase or program a protected location.
0 = No protection violation.
FACCERR — Access Error Flag
FACCERR is set automatically when the proper command sequence is not followed exactly (the
erroneouscommand isignored), ifa program orerase operationis attemptedbefore theFCDIV register
has been initialized, or if the MCU enters stop while a command was in progress. For a more detailed
discussion of the exact actions that are considered access errors, see 4.4.5 Access Errors. FACCERR
is cleared by writing a 1 to FACCERR. Writing a 0 to FACCERR has no meaning or effect.
1 = An access error has occurred.
0 = No access error.
Bit 7 6 54321Bit 0
Read:
FCBEF
FCCF
FPVIOL FACCERR
0 FBLANK 0 0
Write:
Reset: 1 1 000000
= Unimplemented or Reserved
Memory
MC9S08GB/GT62 MOTOROLA
FBLANK — FLASH Verified as All Blank (erased) Flag
FBLANK is set automatically at the conclusion of a blank check command if the entire FLASH array
was verified to be erased. FBLANK is cleared by clearing FCBEF to write a new valid command.
Writing to FBLANK has no meaning or effect.
1 = After a blank check command is completed and FCCF = 1, FBLANK = 1 indicates the FLASH
array is completely erased (all $FF).
0 = After a blank check command is completed and FCCF = 1, FBLANK = 0 indicates the FLASH
array is not completely erased.
4.6.6 FLASH Command Register (FCMD)
Only five command codes are recognized in normal user modes as shown in Table 4-9. Refer to 4.4.3
Program and Erase Command Execution for a detailed discussion of FLASH programming and erase
operations.
All other command codes are illegal and generate an access error.
It is not necessary to perform a blank check command after a mass erase operation. Only blank check is
required as part of the security unlocking mechanism.
Bit 7 6 54321Bit 0
Read: 0 0 000000
Write: FCMD7 FCMD6 FCMD5 FCMD4 FCMD3 FCMD2 FCMD1 FCMD0
Reset: 0 0 000000
= Unimplemented or Reserved
Figure 4-9 FLASH Command Register (FCMD)
Table 4-9 FLASH Commands
Command FCMD Equate File Label
Blank check $05 mBlank
Byte program $20 mByteProg
Byte program — burst mode $25 mBurstProg
Page erase (512 bytes/page) $40 mPageErase
Mass erase (all FLASH) $41 mMassErase
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 63MC9S08GB/GT
Section 5 Resets, Interrupts, and System Configuration
5.1 Introduction
This section discusses basic reset and interrupt mechanisms and the various sources of reset and interrupts
in the MC9S08GB/GT. Some interrupt sources from peripheral modules are discussed in greater detail
within other sections of this data manual. This section gathers basic information about all reset and
interrupt sources in one place for easy reference. A few reset and interrupt sources, including the computer
operating properly (COP) watchdog and real-time interrupt (RTI), are not part of on-chip peripheral
systems with their own sections but are part of the system control logic.
5.2 Features
Reset and interrupt features include:
• Multiple sources of reset for flexible system configuration and reliable operation:
– Power-on detection (POR)
– Low voltage detection (LVD) with enable
– External RESET pin with enable
– COP watchdog with enable and two timeout choices
– Illegal opcode
– Serial command from a background debug host
• Reset status register (SRS) to indicate source of most recent reset
• Separate interrupt vectors for each module (reduces polling overhead) (see Table 5-1)
Resets, Interrupts, and System Configuration
MC9S08GB/GT64 MOTOROLA
5.3 MCU Reset
Resetting the MCU provides a way to start processing from a known set of initial conditions. During reset,
most control and status registers are forced to initial values and the program counter is loaded from the
resetvector ($FFFE:$FFFF). On-chip peripheral modules are disabled and I/Opins are initially configured
as general-purpose high-impedance inputs with pullup devices disabled. The I bit in the condition code
register (CCR) is set to block maskable interrupts so the user program has a chance to initialize the stack
pointer (SP) and system control settings. SP is forced to $00FF at reset.
The MC9S08GB/GT has seven sources for reset:
• Power-on reset (POR)
• Low-voltage detect (LVD)
• Computer operating properly (COP) timer
• Illegal opcode detect
• Background debug forced reset
• The reset pin (RESET)
• Clock generator loss of lock and loss of clock reset
Each of these sources, with the exception of the background debug forced reset, has an associated bit in
thesystem reset status register. Wheneverthe MCU entersreset, the internalclock generator (ICG) module
switches to self-clocked mode with the frequency of fSelf_reset selected. The reset pin is driven low for 34
internal bus cycles where the internal bus frequency is half the ICG frequency. After the 34 cycles are
completed, the pin is released and will be pulled up by the internal pullup resistor, unless it is held low
externally. After the pin is released, it is sampled after another 38 cycles to determine whether the reset
pin is the cause of the MCU reset.
5.4 Computer Operating Properly (COP) Watchdog
The COP watchdog is intended to force a system reset when the application software fails to execute as
expected. To prevent a system reset from the COP timer (when it is enabled), application software must
reset the COP timer periodically. If the application program gets lost and fails to reset the COP before it
times out, a system reset is generated to force the system back to a known starting point. The COP
watchdog is enabled by the COPE bit in SOPT (see 5.8.4SystemOptions Register (SOPT) for additional
information). The COP timer is reset by writing any value to the address of SRS. This write does not affect
the data in the read-only SRS. Instead, the act of writing to this address is decoded and sends a reset signal
to the COP timer.
After any reset, the COP timer is enabled. This provides a reliable way to detect code that is not executing
as intended. If the COP watchdog is not used in an application, it can be disabled by clearing the COPE
bit in the write-once SOPT register. Also, the COPT bit can be used to choose one of two timeout periods
(218 or 213 cycles of the bus rate clock). Even if the application will use the reset default settings in COPE
and COPT, the user should still write to write-once SOPT during reset initialization to lock in the settings.
That way, they cannot be changed accidentally if the application program gets lost.
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 65MC9S08GB/GT
The write to SRS that services (clears) the COP timer should not be placed in an interrupt service routine
(ISR) because the ISR could continue to be executed periodically even if the main application program
fails.
When the MCU is in active background mode, the COP timer is temporarily disabled.
5.5 Interrupts
Interrupts provide a way to save the current CPU status and registers, execute an interrupt service routine
(ISR), and then restore the CPU status so processing resumes where it left off before the interrupt. Other
thanthe software interrupt (SWI), whichis a program instruction, interrupts are caused by hardwareevents
such as an edge on the IRQ pin or a timer-overflow event. The debug module can also generate an SWI
under certain circumstances.
If an event occurs in an enabled interrupt source, an associated read-only status flag will become set. The
CPU will not respond until and unless the local interrupt enable is a logic 1 to enable the interrupt. The I
bit in the CCR is logic 0 to allow interrupts. The global interrupt mask (I bit) in the CCR is initially set
after reset which masks (prevents) all maskable interrupt sources. The user program initializes the stack
pointer and performs other system setup before clearing the I bit to allow the CPU to respond to interrupts.
Whenthe CPUreceives a qualifiedinterrupt request,it completesthe current instructionbefore responding
to the interrupt. The interrupt sequence follows the same cycle-by-cycle sequence as the SWI instruction
and consists of:
• Saving the CPU registers on the stack
• Setting the I bit in the CCR to mask further interrupts
• Fetching the interrupt vector for the highest-priority interrupt that is currently pending
• Filling the instruction queue with the first three bytes of program information starting from the
address fetched from the interrupt vector locations
While the CPU is responding to the interrupt, the I bit is automatically set to avoid the possibility of
another interrupt interrupting the ISR itself (this is called nesting of interrupts). Normally, the I bit is
restored to 0 when the CCR is restored from the value stacked on entry to the ISR. In rare cases, the I bit
may be cleared inside an ISR (after clearing the status flag that generated the interrupt) so that other
interrupts can be serviced without waiting for the first service routine to finish. This practice is not
recommended for anyone other than the most experienced programmers because it can lead to subtle
program errors that are difficult to debug.
The interrupt service routine ends with a return-from-interrupt (RTI) instruction which restores the CCR,
A, X, and PC registers to their pre-interrupt values by reading the previously saved information off the
stack.
NOTE: For compatibility with the M68HC08, the H register is not automatically saved and
restored. It is good programming practice to push H onto the stack at the start of
the interrupt service routine (ISR) and restore it just before the RTI that is used to
return from the ISR.
Resets, Interrupts, and System Configuration
MC9S08GB/GT66 MOTOROLA
When two or more interrupts are pending when the I bit is cleared, the highest priority source is serviced
first (see Table 5-1 Vector Summary).
5.5.1 Interrupt Stack Frame
Figure 5-1 shows the contents and organization of a stack frame. Before the interrupt, the stack pointer
(SP) points at the next available byte location on the stack. The current values of CPU registers are stored
on the stack starting with the low-order byte of the program counter (PCL) and ending with the CCR. After
stacking, the SP points at the next available location on the stack which is the address that is one less than
the address where the CCR was saved. The PC value that is stacked is the address of the instruction in the
main program that would have executed next if the interrupt had not occurred.
Figure 5-1 Interrupt Stack Frame
When an RTI instruction is executed, these values are recovered from the stack in reverse order. As part
of the RTI sequence, the CPU fills the instruction pipeline by reading three bytes of program information,
starting from the PC address just recovered from the stack.
The status flag causing the interrupt must be acknowledged (cleared) before returning from the ISR.
Typically, the flag should be cleared at the beginning of the ISR so that if another interrupt is generated
by this same source, it will be registered so it can be serviced after completion of the current ISR.
5.5.2 External Interrupt Request (IRQ) Pin
External interrupts are managed by the IRQSC status and control register. When the IRQ function is
enabled, synchronous logic monitors the pin for edge-only or edge-and-level events. When the MCU is in
stop mode and system clocks are shut down, a separate asynchronous path is used so the IRQ (if enabled)
can wake the MCU.
CONDITION CODE REGISTER
ACCUMULATOR
INDEX REGISTER (LOW BYTE X)
PROGRAM COUNTER HIGH
* High byte (H) of index register is not automatically stacked.
*
PROGRAM COUNTER LOW
70
UNSTACKING
ORDER
STACKING
ORDER
5
4
3
2
1
1
2
3
4
5
TOWARD LOWER ADDRESSES
TOWARD HIGHER ADDRESSES
SP BEFORE
SP AFTER
INTERRUPT STACKING
THE INTERRUPT
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 67MC9S08GB/GT
5.5.2.1 Pin Configuration Options
The IRQ pin enable (IRQPE) control bit in the IRQSC register must be 1 in order for the IRQ pin to act as
the interrupt request (IRQ) input. As an IRQ input, the user can choose the polarity of edges or levels
detected (IRQEDG), whether the pin detects edges-only or edges and levels (IRQMOD), and whether an
event causes an interrupt or just sets the IRQF flag which can be polled by software.
When the IRQ pin is configured to detect rising edges, an optional pulldown resistor is available rather
than a pullup resistor. BIH and BIL instructions may be used to detect the level on the IRQ pin when the
pin is configured to act as the IRQ input.
NOTE: The voltage measured on the pulled up IRQ pin may be as low as VDD – 0.7 V. The
internal gates connected to this pin are pulled all the way to VDD. All other pins
with enabled pullup resistors will have an unloaded measurement of VDD.
5.5.2.2 Edge and Level Sensitivity
The IRQMOD control bit reconfigures the detection logic so it detects edge events and pin levels. In this
edge detection mode, the IRQF status flag becomes set when an edge is detected (when the IRQ pin
changes from the deasserted to the asserted level), but the flag is continuously set (and cannot be cleared)
as long as the IRQ pin remains at the asserted level.
5.5.3 Interrupt Vectors, Sources, and Local Masks
Table 5-1 provides a summary of all interrupt sources. Higher-priority sources are located toward the
bottom of the table. The high-order byte of the address for the interrupt service routine is located at the
first address in the vector address column, and the low-order byte of the address for the interrupt service
routine is located at the next higher address.
When an interrupt condition occurs, an associated flag bit becomes set. If the associated local interrupt
enable is 1, an interrupt request is sent to the CPU. Within the CPU, if the global interrupt mask (I bit in
the CCR) is 0, the CPU will finish the current instruction, stack the PCL, PCH, X, A, and CCR CPU
registers, set the I bit, and then fetch the interrupt vector for the highest priority pending interrupt.
Processing then continues in the interrupt service routine.
Resets, Interrupts, and System Configuration
MC9S08GB/GT68 MOTOROLA
Table 5-1 Vector Summary
Vector
Priority Address
(High/Low) Vector Name Module Source Enable Description
Lower
Higher
$FFC0/FFC1
through
$FFCA/FFCB
Unused Vector Space
(available for user program)
$FFCC/FFCD Vrti System
control RTIF RTIE Real-time interrupt
$FFCE/FFCF Viic IIC IICIS IICIE IIC control
$FFD0/FFD1 Vatd ATD COCO AIEN AD conversion
complete
$FFD2/FFD3 Vkeyboard KBI KBF KBIE Keyboard pins
$FFD4/FFD5 Vsci2tx SCI2 TDRE
TC TIE
TCIE SCI2 transmit
$FFD6/FFD7 Vsci2rx SCI2 IDLE
RDRF ILIE
RIE SCI2 receive
$FFD8/FFD9 Vsci2err SCI2
OR
NF
FE
PF
ORIE
NFIE
FEIE
PFIE
SCI2 error
$FFDA/FFDB Vsci1tx SCI1 TDRE
TC TIE
TCIE SCI1 transmit
$FFDC/FFDD Vsci1rx SCI1 IDLE
RDRF ILIE
RIE SCI1 receive
$FFDE/FFDF Vsci1err SCI1
OR
NF
FE
PF
ORIE
NFIE
FEIE
PFIE
SCI1 error
$FFE0/FFE1 Vspi SPI SPIF
MODF
SPTEF
SPIE
SPIE
SPTIE SPI
$FFE2/FFE3 Vtpm2ovf TPM2 TOF TOIE TPM2 overflow
$FFE4/FFE5 Vtpm2ch4 TPM2 CH4F CH4IE TPM2 channel 4
$FFE6/FFE7 Vtpm2ch3 TPM2 CH3F CH3IE TPM2 channel 3
$FFE8/FFE9 Vtpm2ch2 TPM2 CH2F CH2IE TPM2 channel 2
$FFEA/FFEB Vtpm2ch1 TPM2 CH1F CH1IE TPM2 channel 1
$FFEC/FFED Vtpm2ch0 TPM2 CH0F CH0IE TPM2 channel 0
$FFEE/FFEF Vtpm1ovf TPM1 TOF TOIE TPM1 overflow
$FFF0/FFF1 Vtpm1ch2 TPM1 CH2F CH2IE TPM1 channel 2
$FFF2/FFF3 Vtpm1ch1 TPM1 CH1F CH1IE TPM1 channel 1
$FFF4/FFF5 Vtpm1ch0 TPM1 CH0F CH0IE TPM1 channel 0
$FFF6/FFF7 Vicg ICG ICGIF
(LOLS/LOCS) LOLRE/LOCRE ICG
$FFF8/FFF9 Vlvd System
control LVDF LVDIE Low-voltage detect
$FFFA/FFFB Virq IRQ IRQF IRQIE IRQ pin
$FFFC/FFFD Vswi Core SWI
Instruction — Software interrupt
$FFFE/FFFF Vreset System
control
COP
LVD
RESET pin
Illegal opcode
COPE
LVDRE
—
—
Watchdog timer
Low-voltage detect
External pin
Illegal opcode
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 69MC9S08GB/GT
5.6 Low-Voltage Detect (LVD) System
The MC9S08GB/GT includes a system to protect against low voltage conditions in order to protect
memory contents and control MCU system states during supply voltage variations. The system is
comprised of a power-on reset (POR) circuit and an LVD circuit with a user selectable trip voltage, either
high (VLVDH) or low (VLVDL). The LVD circuit is enabled when LVDE in SPMSC1 is high and the trip
voltage is selected by LVDV in SPMSC2. The LVD is disabled upon entering any of the stop modes unless
the LVDSE bit is set. If LVDSE and LVDE are both set, then the MCU cannot enter stop1 or stop2, and
the current consumption in stop3 with the LVD enabled will be greater.
5.6.1 Power-On Reset Operation
When power is initially applied to the MCU, or when the supply voltage drops below the VPOR level, the
POR circuit will cause a reset condition. As the supply voltage rises, the LVD circuit will hold the chip in
reset until the supply has risen above the VLVDH level. Both the POR bit and the LVD bit in SRS are set
following a POR.
5.6.2 LVD Reset Operation
The LVD can be configured to generate a reset upon detection of a low voltage condition by setting
LVDREto 1. Once anLVD reset has occurred,the LVD system will hold the MCUin reset until thesupply
voltage has risen above the level determined by LVDV. The LVD bit in the SRS register is set following
either an LVD reset or POR.
5.6.3 LVD Interrupt Operation
When a low voltage condition is detected and the LVD circuit is configured for interrupt operation (LVDE
set, LVDIE set, and LVDRE clear), then LVDF will be set and an LVD interrupt will occur.
5.6.4 Low-Voltage Warning (LVW)
The LVD system has a low voltage warning flag to indicate to the user that the supply voltage is
approaching, but is still above, the LVD voltage. The LVW does not have an interrupt associated with it.
There are two user selectable trip voltages for the LVW, one high (VLVWH) and one low (VLVWL). The
trip voltage is selected by LVWV in SPMSC2.
5.7 Real-Time Interrupt (RTI)
The real-time interrupt function can be used to generate periodic interrupts based on a divide of the
external oscillator during run mode. It can also be used to wake the MCU from stop2 using the internal
1-kHz reference, or from stop3 using either the internal reference or the external oscillator if it is enabled
in stop modes.
The SRTISC register includes a read-only status flag, a write-only acknowledge bit, and a 3-bit control
value (RTIS2:RTIS1:RTIS0) used to disable the clock source to the real-time interrupt or select one of
Resets, Interrupts, and System Configuration
MC9S08GB/GT70 MOTOROLA
seven wakeup delays between 8 ms and 1.024 seconds. The 1-kHz clock source and therefore the periodic
rates have a tolerance of about ±30 percent. The RTI has a local interrupt enable, RTIE, to allow masking
of the real-time interrupt. It can be disabled by writing 0:0:0 to RTIS2:RTIS1:RTIS0 so the clock source
is disabled and no interrupts will be generated. See 5.8.6 System Real-Time Interrupt Status and
Control Register (SRTISC) for detailed information about this register.
5.8 Reset, Interrupt, and System Control Registers and Control Bits
One 8-bit register in the direct page register space and eight 8-bit registers in the high-page register space
are related to reset and interrupt systems.
Refer to the direct-page register summary in the Memorysection of this data sheet for the absolute address
assignments for all registers. This section refers to registers and control bits only by their names. A
Motorola-provided equate or header file is used to translate these names into the appropriate absolute
addresses.
Some control bits in the SOPT and SPMSC2 registers are related to modes of operation. Although brief
descriptions of these bits are provided here, the related functions are discussed in greater detail in
Section 3 Modes of Operation.
5.8.1 Interrupt Pin Request Status and Control Register (IRQSC)
This direct page register includes two unimplemented bits which always read 0, four read/write bits, one
read-only status bit, and one write-only bit. These bits are used to configure the IRQ function, report status,
and acknowledge IRQ events.
Figure 5-2 Interrupt Request Status and Control Register (IRQSC)
IRQEDG — Interrupt Request (IRQ) Edge Select
This read/write control bit is used to select the polarity of edges or levels on the IRQ pin that cause
IRQF to be set. The IRQMOD control bit determines whether the IRQ pin is sensitive to both edges
andlevels or just edges. Whenthe IRQ pin is enabledas the IRQ input andis configured to detect rising
edges, the optional pullup resistor is reconfigured as an optional pulldown resistor.
1 = IRQ is rising edge or rising edge/high-level sensitive.
0 = IRQ is falling edge or falling edge/low-level sensitive.
Bit 7 654321Bit 0
Read: 0 0
IRQEDG IRQPE
IRQF 0
IRQIE IRQMOD
Write: IRQACK
Reset: 00000000
= Unimplemented or Reserved
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 71MC9S08GB/GT
IRQPE — IRQ Pin Enable
This read/write control bit enables the IRQ pin function. When this bit is set the IRQ pin can be used
as an interrupt request. Also, when this bit is set, either an internal pull-up or an internal pull-down
resistor is enabled depending on the state of the IRQMOD bit.
1 = IRQ pin function is enabled.
0 = IRQ pin function is disabled.
IRQF — IRQ Flag
This read-only status bit indicates when an interrupt request event has occurred.
1 = IRQ event detected.
0 = No IRQ request.
IRQACK — IRQ Acknowledge
This write-only bit is used to acknowledge interrupt request events (write 1 to clear IRQF). Writing 0
has no meaning or effect. Reads always return logic 0. If edge-and-level detection is selected
(IRQMOD = 1), IRQF cannot be cleared while the IRQ pin remains at its asserted level.
IRQIE — IRQ Interrupt Enable
This read/write control bit determines whether IRQ events generate a hardware interrupt request.
1 = Hardware interrupt requested whenever IRQF = 1.
0 = Hardware interrupt requests from IRQF disabled (use polling).
IRQMOD — IRQ Detection Mode
This read/write control bit selects either edge-only detection or edge-and-level detection. The
IRQEDG control bit determines the polarity of edges and levels that are detected as interrupt request
events. See 5.5.2.2 Edge and Level Sensitivity for more details.
1 = IRQ event on falling edges and low levels or on rising edges and high levels.
0 = IRQ event on falling edges or rising edges only.
5.8.2 System Reset Status Register (SRS)
This register includes seven read-only status flags to indicate the source of the most recent reset. When a
debug host forces reset by writing 1 to BDFR in the SBDFR register, none of the status bits in SRS will
be set. Writing any value to this register address clears the COP watchdog timer without affecting the
contents of this register. The reset state of these bits depends on what caused the MCU to reset.
Resets, Interrupts, and System Configuration
MC9S08GB/GT72 MOTOROLA
Figure 5-3 System Reset Status (SRS)
POR — Power-On Reset
Reset was caused by the power-on detection logic. Since the internal supply voltage was ramping up
at the time, the low-voltage reset (LVR) status bit is also set to indicate that the reset occurred while
the internal supply was below the LVR threshold.
1 = POR caused reset.
0 = Reset not caused by POR.
PIN — External Reset Pin
Reset was caused by an active-low level on the external reset pin.
1 = Reset came from external reset pin.
0 = Reset not caused by external reset pin.
COP — Computer Operating Properly (COP) Watchdog
Reset was caused by the COP watchdog timer timing out. This reset source may be blocked by
COPE = 0.
1 = Reset caused by COP timeout.
0 = Reset not caused by COP timeout.
ILOP — Illegal Opcode
Reset was caused by an attempt to execute an unimplemented or illegal opcode. The STOP instruction
is considered illegal if stop is disabled by STOPE = 0 in the SOPT register. The BGND instruction is
considered illegal if active background mode is disabled by ENBDM = 0 in the BDCSC register.
1 = Reset caused by an illegal opcode.
0 = Reset not caused by an illegal opcode.
ICG — Internal Clock Generation Module Reset
Reset was caused by an ICG module reset.
1 = Reset caused by ICG module.
0 = Reset not caused by ICG module.
Bit 7 6 54321Bit 0
Read: POR PIN COP ILOP 0 ICG LVD 0
Write: Writing any value to SIMRS address clears COP watchdog timer.
Power-on reset: 1 0 000010
Low-voltage reset: 0 0 000010
Any other reset: 0 (1)
NOTES:
1. Any of these reset sources that are active at the time of reset will cause the corresponding bit(s) to be set;
bits corresponding to sources that are not active at the time of reset will be cleared.
(1) (1) 0(1) 00
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 73MC9S08GB/GT
LVD — Low Voltage Detect
If the LVDRE and LVDSE bits are set and the supply drops below the LVD trip voltage, an LVD reset
will occur. This bit is also set by POR.
1 = Reset caused by LVD trip or POR.
0 = Reset not caused by LVD trip or POR.
5.8.3 System Background Debug Force Reset Register (SBDFR)
This register contains a single write-only control bit. A serial background command such as
WRITE_BYTE must be used to write to SBDFR. Attempts to write this register from a user program are
ignored. Reads always return $00.
Figure 5-4 System Background Debug Force Reset Register (SBDFR)
BDFR — Background Debug Force Reset
A serial background command such as WRITE_BYTE may be used to allow an external debug host
to force a target system reset. Writing logic 1 to this bit forces an MCU reset. This bit cannot be written
from a user program.
5.8.4 System Options Register (SOPT)
This register may be read at any time. Bits 3 and 2 are unimplemented and always read 0. This is a
write-once register so only the first write after reset is honored. Any subsequent attempt to write to SOPT
(intentionally or unintentionally) is ignored to avoid accidental changes to these sensitive settings. SOPT
should be written during the user’s reset initialization program to set the desired controls even if the
desired settings are the same as the reset settings.
Bit 7 654321Bit 0
Read: 00000000
Write: BDFR(1)
NOTES:
1. BDFR is writable only through serial background debug commands, not from user programs.
Reset: 00010000
= Unimplemented or Reserved
Bit 7 654321Bit 0
Read:
COPE COPT STOPE
00
BKGDPE
Write:
Reset: 11010011
= Unimplemented or Reserved
Figure 5-5 System Options Register (SOPT)
Resets, Interrupts, and System Configuration
MC9S08GB/GT74 MOTOROLA
COPE — COP Watchdog Enable
This write-once bit defaults to 1 after reset.
1 = COP watchdog timer enabled (force reset on timeout).
0 = COP watchdog timer disabled.
COPT — COP Watchdog Timeout
This write-once bit defaults to 1 after reset.
1 = Long timeout period selected (218 cycles of BUSCLK).
0 = Short timeout period selected (213 cycles of BUSCLK).
STOPE — Stop Mode Enable
This write-once bit defaults to 0 after reset, which disables stop mode. If stop mode is disabled and a
user program attempts to execute a STOP instruction, an illegal opcode reset is forced.
1 = Stop mode enabled.
0 = Stop mode disabled.
BKGDPE — Background Debug Mode Pin Enable
The BKGDPE bit enables the PTD0/BKGD/MS pin to function as BKGD/MS. When the bit is clear,
the pin will function as PTD0, which is an output only general purpose I/O. This pin always defaults
to BKGD/MS function after any reset.
1 = BKGD pin enabled.
0 = BKGD pin disabled.
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 75MC9S08GB/GT
5.8.5 System Device Identification Register (SDIDH, SDIDL)
This read-only register is included so host development systems can identify the HCS08 derivative and
revision number. This allows the development software to recognize where specific memory blocks,
registers, and control bits are located in a target MCU.
Figure 5-6 System Device Identification Register (SDIDH, SDIDL)
REV[3:0] — Revision Number
The high-order 4 bits of address $1806 are hard coded to reflect the current mask set revision number
(0–F).
ID[11:0] — Part Identification Number
Each derivative in the HCS08 Family has a unique identification number. The MC9S08GB/GT is hard
coded to the value $002.
5.8.6 System Real-Time Interrupt Status and Control Register (SRTISC)
This register contains one read-only status flag, one write-only acknowledge bit, three read/write delay
selects, and three unimplemented bits, which always read 0.
Figure 5-7 System RTI Status and Control Register (SRTISC)
Bit 7 6 5 4321Bit 0
Read: REV3 REV2 REV1 REV0 ID11 ID10 ID9 ID8
Reset: 0(1)
NOTES:
1. The revision number that is hard coded into these bits reflects the current silicon revision level.
0(1) 0(1) 0(1) 0000
Read: ID7 ID6 ID5 ID4 ID3 ID2 ID1 ID0
Reset: 0 0 0 00010
= Unimplemented or Reserved
Bit 7 6 5 4321Bit 0
Read: RTIF 0 RTICLKS RTIE 0RTIS2 RTIS1 RTIS0
Write: RTIACK
Reset: 0 0 0 00000
= Unimplemented or Reserved
Resets, Interrupts, and System Configuration
MC9S08GB/GT76 MOTOROLA
RTIF — Real-Time Interrupt Flag
This read-only status bit indicates the periodic wakeup timer has timed out.
1 = Periodic wakeup timer timed out.
0 = Periodic wakeup timer not timed out.
RTIACK — Real-Time Interrupt Acknowledge
This write-only bit is used to acknowledge real-time interrupt request (write 1 to clear RTIF). Writing
0 has no meaning or effect. Reads always return logic 0.
RTICLKS — Real-Time Interrupt Clock Select
This read/write bit selects the clock source for the real-time interrupt.
1 = Real-time interrupt request clock source is external clock.
0 = Real-time interrupt request clock source is internal 1-kHz oscillator.
RTIE — Real-Time Interrupt Enable
This read-write bit enables real-time interrupts.
1 = Real-time interrupts enabled.
0 = Real-time interrupts disabled.
RTIS2:RTIS1:RTIS0 — Real-Time Interrupt Delay Selects
These read/write bits select the wakeup delay for the RTI. The clock source for the real-time interrupt
is a self-clocked source which oscillates at about 1 kHz, is independent of other MCU clock sources.
Using external clock source the delays will be crystal frequency divided by value in
RTIS2:RTIS1:RTIS0.
Table 5-2 Real-Time Interrupt Frequency
RTIS2:RTIS1:RTIS0 1-kHz Clock Source Delay(1)
NOTES:
1. Normal values are shown in this column based on fRTI = 1 kHz. See Table A-10 Control Timing fRTI for the
tolerance on these values.
Using External Clock Source Delay
(crystal frequency)
0:0:0 Disable periodic wakeup timer Disable periodic wakeup timer
0:0:1 8 ms divide by 256
0:1:0 32 ms divide by 1024
0:1:1 64 ms divide by 2048
1:0:0 128 ms divide by 4096
1:0:1 256 ms divide by 8192
1:1:0 512 ms divide by 16384
1:1:1 1.024 s divide by 32768
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 77MC9S08GB/GT
5.8.7 System Power Management Status and Control 1 Register (SPMSC1)
Figure 5-8 System Power Management Status and Control 1 Register (SPMSC1)
LVDF — Low-Voltage Detect Flag
Provided LVDE = 1, this read-only status bit indicates a low-voltage detect event.
LVDACK — Low-Voltage Detect Acknowledge
This write-only bit is used to acknowledge low voltage detection errors (write 1 to clear LVDF). Reads
always return logic 0.
LVDIE — Low-Voltage Detect Interrupt Enable
This read/write bit enables hardware interrupt requests for LVDF.
1 = Request a hardware interrupt when LVDF = 1.
0 = Hardware interrupt disabled (use polling).
LVDRE — Low-Voltage Detect Reset Enable
This read/write bit enables LVDF events to generate a hardware reset (provided LVDE = 1).
1 = Force an MCU reset when LVDF = 1.
0 = LVDF does not generate hardware resets.
LVDSE — Low-Voltage Detect Stop Enable
Provided LVDE = 1, this read/write bit determines whether the low-voltage detect function operates
when the MCU is in stop mode.
1 = Low-voltage detect enabled during stop mode.
0 = Low-voltage detect disabled during stop mode.
LVDE — Low-Voltage Detect Enable
This read/write bit enables low-voltage detect logic and qualifies the operation of other bits in this
register.
1 = LVD logic enabled.
0 = LVD logic disabled.
Bit 7 6 54321Bit 0
Read: LVDF 0
LVDIE LVDRE(1)
NOTES:
1. This bit can be written only one time after reset. Additional writes are ignored.
LVDSE(1) LVDE(1) 00
Write: LVDACK
Reset: 0 0 011100
= Unimplemented or Reserved
Resets, Interrupts, and System Configuration
MC9S08GB/GT78 MOTOROLA
5.8.8 System Power Management Status and Control 2 Register (SPMSC2)
This register is used to report the status of the low voltage warning function, and to configure the stop
mode behavior of the MCU.
Figure 5-9 System Power Management Status and Control 2 Register (SPMSC2)
LVWF — Low-Voltage Warning Flag
The LVWF bit indicates the low voltage warning status.
1 = Low voltage warning is present or was present.
0 = Low voltage warning not present.
LVWACK — Low-Voltage Warning Acknowledge
The LVWF bit indicates the low voltage warning status.
Writing a logic 1 to LVWACK clears LVWF to a logic 0 if a low voltage warning is not present.
LVDV — Low-Voltage Detect Voltage Select
The LVDV bit selects the LVD trip point voltage (VLVD).
1 = High trip point selected (VLVD = VLVDH).
0 = Low trip point selected (VLVD = VLVDL).
LVWV — Low-Voltage Warning Voltage Select
The LVWV bit selects the LVW trip point voltage (VLVW).
1 = High trip point selected (VLVW = VLVWH).
0 = Low trip point selected (VLVW = VLVWL).
PPDF — Partial Power Down Flag
The PPDF bit indicates that the MCU has exited the stop2 mode.
1 = Stop2 mode recovery.
0 = Not stop2 mode recovery.
Bit 7 6 54321Bit 0
Read: LVWF 0
LVDV LVWV
PPDF 0
PDC PPDC
Write: LVWACK PPDACK
Power-on reset: 0(1)
NOTES:
1. LVWF will be set in the case when VSupply transitions below the trip point or after reset and VSupply is already
below VLVW.
0000000
LVD reset: 0(1) 0 UU0000
Any other reset: 0(1) 0 UU0000
= Unimplemented or Reserved U = Unaffected by reset
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 79MC9S08GB/GT
PPDACK — Partial Power Down Acknowledge
Writing a logic 1 to PPDACK clears the PPDF bit.
PDC — Power Down Control
The write-once PDC bit controls entry into the power down (stop2 and stop1) modes.
1 = Power down modes are enabled.
0 = Power down modes are disabled.
PPDC — Partial Power Down Control
The write-once PPDC bit controls which power down mode, stop1 or stop2, is selected.
1 = Stop2, partial power down, mode enabled if PDC set.
0 = Stop1, full power down, mode enabled if PDC set.
Resets, Interrupts, and System Configuration
MC9S08GB/GT80 MOTOROLA
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 81MC9S08GB/GT
Section 6 Internal Clock Generator (ICG) Module
The MC9S08GB/GT microcontroller provides one internal clock generation (ICG) module to create the
system bus frequency. All functions described in this section are available on the MC9S08GB/GT
microcontroller. The EXTAL and XTAL pins share port G bits 2 and 1, respectively. Analog supply lines
VDDA and VSSA are internally derived from the MCU’s VDD and VSS pins. Electrical parametric data for
the ICG may be found in the Electrical Characteristics appendix.
Figure 6-1 System Clock Distribution Diagram
NOTE: Motorola recommends that FLASH location $FFBE be reserved to store a
nonvolatile version of ICGTRM. This will allow debugger and programmer
vendors to perform a manual trim operation and store the resultant ICGTRM value
for users to access at a later time.
TPM1 TPM2 IIC SCI1 SCI2 SPI
BDC
CPU ATD RAM FLASH
ICG
ICGOUT ÷2
FFE
ICGRCLK
SYSTEM
LOGIC
BUSCLK
ICGLCLK*
ATD has min and max
frequency requirements.
See ATD section and
FLASH has frequency
requirements for program
and erase operation.
See Appendix A.
Appendix A.
CONTROL
FIXED FREQ CLOCK (XCLK)
ICGERCLK RTI
* ICGLCLK is the alternate BDC clock source for the MC9S08GB/GT.
Internal Clock Generator (ICG) ModuleInternal Clock Generator (ICG) Module
MC9S08GB/GT82 MOTOROLA
Figure 6-2 Block Diagram Highlighting ICG Module
PTD3/TPM2CH0
PTD4/TPM2CH1
PTD5/TPM2CH2
PTD6/TPM2CH3
PTC1/RxD2
PTC0/TxD2
VSS
VDD
PTE3/MISO
PTE2/SS
PTA7/KBIP7–
PTE0/TxD1
PTE1/RxD1
PTD2/TPM1CH2
PTD1/TPM1CH1
PTD0/TPM1CH0
PTC7
PTC6
PTC5
PTC4
PTC3/SCL
PTC2/SDA
PORT A
PORT C
PORT D
PORT E
8-BIT KEYBOARD
INTERRUPT MODULE (KBI)
IIC MODULE (IIC)
SERIAL PERIPHERAL
INTERFACE MODULE (SPI)
USER FLASH
USER RAM
(GB60 = 4096 BYTES)
DEBUG
MODULE (DBG)
(GB60 = 61,268 BYTES)
HCS08 CORE
CPU
BDC
INT
BKP
NOTES:
1. Port pins are software configurable with pullup device if input port.
2. Pin contains software configurable pullup/pulldown device if IRQ enabled (IRQPE = 1).
3. IRQ does not have a clamp diode to VDD. IRQ should not be driven above VDD.
4. Pin contains integrated pullup device.
5. High current drive
6. Pins PTA[7:4] contain software configurable pullup/pulldown device.
NOTE 1
NOTE 1
3-CHANNEL TIMER/PWM
MODULE (TPM1)
PTB7/AD7–
PORT B
PTE5/SPSCK
PTE4/MOSI
PTE6
PTE7
INTERFACE MODULE (SCI2)
HCS08 SYSTEM CONTROL
RESETS AND INTERRUPTS
MODES OF OPERATION
POWER MANAGEMENT
VOLTAGE
REGULATOR
RTI
SERIAL COMMUNICATIONS
COP
IRQ LVD
INTERNAL BUS
LOW-POWER OSCILLATOR
INTERNAL CLOCK
GENERATOR (ICG)
RESET
VSSAD
VDDAD
VREFH
VREFL
ANALOG-TO-DIGITAL
CONVERTER (ATD)
INTERFACE MODULE (SCI1)
SERIAL COMMUNICATIONS
5-CHANNEL TIMER/PWM
MODULE (TPM2)
PORT F
PTF7–PTF0
NOTE 1
PTD7/TPM2CH4
8
PTA0/KBIP0
8
PTB0/AD0
8
PTG3
PTG2/EXTAL
PTG0/BKGD/MS
PTG1/XTAL
PORT G
PTG4
PTG6
PTG7
PTG5
NOTE 4
NOTES 1, 5
(GB32 = 32,768 BYTES)
(GB32 = 2048 BYTES)
IRQ
NOTES 2, 3
10-BIT
NOTES 1, 6
NOTE 1
NOTES 1, 5
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 83MC9S08GB/GT
6.1 Introduction
Figure 6-3 is a top-level diagram that shows the functional organization of the internal clock generation
(ICG) module. This section includes a general description and a feature list.
Figure 6-3 ICG Block Diagram
The ICG provides multiple options for clock sources. This offers a user great flexibility when making
choices between cost, precision, current draw, and performance. As seen in Figure 6-3, the ICG consists
of four functional blocks. Each of these is briefly described here and then in more detail in a later section.
•Oscillator block — The oscillator block provides means for connecting an external crystal or
resonator. Two frequency ranges are software selectable to allow optimal startup and stability.
Alternatively, the oscillator block can be used to route an external square wave to the system clock.
External sources can provide a very precise clock source.
•Internal reference generator — The internal reference generator consists of two controlled clock
sources. One is designed to be approximately 8 MHz and can be selected as a local clock for the
background debug controller. The other internal reference clock source is typically 243 kHz and
can be trimmed for finer accuracy via software when a precise timed event is input to the MCU.
This provides a highly reliable, low-cost clock source.
OSCILLATOR (OSC)
FREQUENCY
INTERNAL
EXTAL
XTAL
REFERENCE
GENERATORS
CLOCK
SELECT
8 MHz
IRG
LOSS OF LOCK
AND CLOCK DETECTOR
LOCKED
LOOP (FLL)
FIXED
CLOCK
SELECT
ICGOUT
TYP 243 kHz
RG
ICGLCLK
ICG
FFE
ICGRCLK
V
DDA
VSSA
(SEE NOTE 2)
(SEE NOTE 2)
DCO
WITH EXTERNAL REF
SELECT
REF
SELECT
LOCAL CLOCK FOR OPTIONAL USE WITH BDC
OUTPUT
CLOCK
SELECT
ICGDCLK /R
ICGERCLK
ICGIRCLK
NOTES:
1. See chip level clock routing diagram for specific use of ICGCLK, FFE, ICGLCLK, ICGERCLK, ICGIRCLK
2. Not all HCS08 microcontrollers have unique supply pins for the ICG. See the device pin assignments in
the Pins and Connections section for specifics.
Internal Clock Generator (ICG) Module
MC9S08GB/GT84 MOTOROLA
•Frequency-locked loop — A frequency-locked loop (FLL) stage takes either the internal or
external clock source and multiplies it to a higher frequency. Status bits provide information when
the circuit has achieved lock and when it falls out of lock. Additionally, this block can monitor the
external reference clock and signals whether the clock is valid or not.
•Clock select block — The clock select block provide several switch options for connecting
different clock sources to the system clock tree. ICGOUT is the multiplied clock frequency out of
the FLL, ICGRCLK is the reference clock frequency from the crystal or external clock source, and
FFE (fixed frequency enable) is a control signal used to select either ICGRCLK or ICGLCLK as
the clock source for the BDC.
The module is intended to be very user friendly with many of the features occurring automatically without
user intervention. To quickly configure the module, go to Initialization/Application Information and
pick an example that best suits the application needs.
6.1.1 Features
Features of the ICG and clock distribution system:
• Several options for the primary clock source allow a wide range of cost, frequency, and precision
choices:
– 32 kHz–100 kHz crystal or resonator
– 1 MHz–16 MHz crystal or resonator
– External clock
– Internal reference generator
• Defaults to self-clocked mode to minimize startup delays
• Frequency-locked loop (FLL) generates 8 MHz to 40 MHz (for bus rates up to 20 MHz)
– Uses external or internal clock as reference frequency
• Automatic lockout of non-running clock sources
• Reset or interrupt on loss of clock or loss of FLL lock
• Digitally-controlled oscillator (DCO) preserves previous frequency settings, allowing fast
frequency lock when recovering from stop3 mode
• DCO will maintain operating frequency during a loss or removal of reference clock
• Post-FLL divider selects 1 of 8 bus rate divisors (/1 through /128)
• Separate self-clocked source for real-time interrupt
• Trimmable internal clock source supports SCI communications without additional external
components
• Automatic FLL engagement after lock is acquired
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 85MC9S08GB/GT
6.1.2 Modes of Operation
This is a high-level description only. Detailed descriptions of operating modes are contained in 6.3
Functional Description
• Mode 1 — Off
The output clock, ICGOUT, is static. This mode may be entered when the STOP instruction is
executed.
• Mode 2 — Self-clocked (SCM)
Default mode of operation that is entered out of reset. The ICG’s FLL is open loop and the digitally
controlled oscillator (DCO) is free running at a frequency set by the filter bits.
• Mode 3 — FLL engaged internal (FEI)
In this mode, the ICG’s FLL is used to create frequencies that are programmable multiples of the
internal reference clock.
– FLL engaged internal unlocked is a transition state which occurs while the FLL is attempting to
lock.The FLL DCO frequency isoff target and the FLL is adjusting the DCOto match the target
frequency.
– FLL engaged internal locked is a state which occurs when the FLL detects that the DCO is
locked to a multiple of the internal reference.
• Mode 4 — FLL bypassed external (FBE)
In this mode, the ICG is configured to bypass the FLL and use an external clock as the clock source.
• Mode 5 — FLL engaged external (FEE)
The ICG’s FLL is used to generate frequencies that are programmable multiples of the external
clock reference.
– FLL engaged external unlocked is a transition state which occurs while the FLL is attempting
to lock. The FLL DCO frequency is off target and the FLL is adjusting the DCO to match the
target frequency.
– FLL engaged external locked is a state which occurs when the FLL detects that the DCO is
locked to a multiple of the internal reference.
6.2 External Signal Description
6.2.1 Overview
Table 6-1 shows the user-accessible signals available for the ICG.
Internal Clock Generator (ICG) Module
MC9S08GB/GT86 MOTOROLA
6.2.2 Detailed Signal Descriptions
This section describes each pin signal in detail.
6.2.2.1 EXTAL— External Reference Clock / Oscillator Input
If the first write to the ICG control register 1 selected FLL engaged external or FLL bypassed modes, this
signal is the analog external/reference clock or the input of the oscillator circuit. If the first write to the
ICG control register 1 selected FLL engaged internal or self-clocked modes, this signal has no effect on
the ICG.
6.2.2.2 XTAL— Oscillator Output
If the first write to the ICG control register 1 selected FLL engaged external or FLL bypassed modes using
a crystal/resonator reference, this signal is the analog output of the oscillator amplifier circuit. In all other
cases, this signal has no effect on the ICG.
6.2.3 External Clock Connections
If an external clock is used, then the pins are connected as shown below.
Figure 6-4 External Clock Connections
Table 6-1 Signal Properties
Name Function Reset State
EXTAL External clock/oscillator input Analog input
XTAL Oscillator output Analog output
ICG
XTALEXTAL VSS
CLOCK INPUT
NOT CONNECTED
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 87MC9S08GB/GT
6.2.4 External Crystal/Resonator Connections
If an external crystal/resonator frequency reference is used, then the pins are connected as shown below.
Recommended component values are listed in the Electrical Characteristics section.
Figure 6-5 External Frequency Reference Connection
6.3 Functional Description
Thissection provides a functional description of each of thefive operating modes of the ICG. Also covered
are the loss of clock and loss of lock errors and requirements for entry into each mode.
6.3.1 Off Mode (Off)
Normally when the CPU enters stop mode, the ICG will cease all clock activity and is in the off state.
However there are two cases to consider when clock activity continues while the CPU is in stop mode,
6.3.1.1 BDM Active
When the BDM is enabled (ENBDM = 1), the ICG continues activity as originally programmed. This
allows access to memory and control registers via the BDC controller.
ICG
EXTAL XTALVSS
C1C2
CRYSTAL OR RESONATOR
RF
RS
Internal Clock Generator (ICG) Module
MC9S08GB/GT88 MOTOROLA
6.3.1.2 OSCSTEN Bit Set
When the oscillator is enabled in stop mode (OSCSTEN = 1), the individual clock generators are enabled
but the clock feed to the rest of the MCU is turned off. This option is provided to avoid long oscillator
startup times if necessary, or to run the RTI from the oscillator during stop3.
6.3.1.3 Stop/Off Mode Recovery
Uponthe CPU exitingstop mode due toan interrupt, thepreviously set control bits are valid andthe system
clock feed resumes. If FEE is selected, the ICG will source the internal reference until the external clock
is stable. If FBE is selected, the ICG will wait for the external clock to stabilize before enabling ICGOUT.
Upon the CPU exiting stop mode due to a reset, the previously set ICG control bits are ignored and the
default reset values applied. Therefore the ICG will exit stop in SCM mode configured for an
approximately 8 MHz DCO output (4 MHz bus clock) with trim value maintained. If using a crystal, 4096
clocks are detected prior to engaging ICGERCLK. This is incorporated in crystal start-up time.
6.3.2 Self-Clocked Mode (SCM)
Self-clocked mode (SCM) is the default mode of operation and is entered when any of the following
conditions occur:
• After any reset.
• Exiting from off mode when CLKS does not equal 10. If CLKS = X1, the ICG enters this state
temporarily until the DCO is stable (DCOS = 1).
• CLKS bits are written from X1 to 00.
• CLKS = 1X and ICGERCLK is not detected (both ERCS = 0 and LOCS = 1).
In this state, the FLL loop is open. The DCO is on, and the output clock signal ICGOUT frequency is given
by fICGDCLK / R. The ICGDCLK frequency can be varied from 8 MHz to 40 MHz by writing a new value
into the filter registers (ICGFLTH and ICGFLTL). This is the only mode in which the filter registers can
be written.
If this mode is entered due to a reset, fICGDCLK will default to fSelf_reset which is nominally 8 MHz. If this
mode is entered from FLL engaged internal, fICGDCLK will maintain the previous frequency.If this mode
is entered from FLL engaged external (either by programming CLKS or due to a loss of external reference
clock), fICGDCLK will maintain the previous frequency, but ICGOUT will double if the FLL was unlocked.
If this mode is entered from off mode, fICGDCLK will be equal to the frequency of ICGDCLK before
entering off mode. If CLKS bits are set to 01 or 11 coming out of the Off state, the ICG enters this mode
until ICGDCLK is stable as determined by the DCOS bit. Once ICGDCLK is considered stable, the ICG
automatically closes the loop by switching to FLL engaged (internal or external) as selected by the CLKS
bits.
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 89MC9S08GB/GT
Figure 6-6 Detailed Frequency-Locked Loop Block Diagram
REFERENCE
DIVIDER (/7)
RFD
CLKST
SUBTRACTOR
LOOP
FILTER
DIGITALLY
CONTROLLED
OSCILLATOR
CLOCK ICGOUT
ICG2DCLK
RESET AND
INTERRUPT
IRQ
FLL ANALOG
SELECT
CIRCUIT
LOLS
PULSE
COUNTER
MFD
FREQUENCY-
EXTERNAL REFERENCE CLOCK
LOCS
LOCK AND
DETECTOR
LOCK
CONTROL
LOLRE LOCRE
RESET
REDUCED
FREQUENCY
DIVIDER (R)
LOSS OF CLOCK
ICGIF
ERCS
ICGDCLK
LOOP (FLL)
DIGITAL
FLT
COUNTER ENABLE
LOCKED
ERR
CNT
OVERFLOW
1x
2x
ICGRCLK
CLKST
DCOS
RANGE
RANGE
Internal Clock Generator (ICG) Module
MC9S08GB/GT90 MOTOROLA
6.3.3 FLL Engaged, Internal Clock (FEI) Mode
FLL engaged internal (FEI) is entered when any of the following conditions occur:
• CLKS bits are written to 01
• The DCO clock stabilizes (DCOS = 1) while in SCM upon exiting the off state with CLKS = 01
In FLL engaged internal mode, the reference clock is derived from the internal reference clock
ICGIRCLK, and the FLL loop will attempt to lock the ICGDCLK frequency to the desired value, as
selected by the MFD bits.
6.3.3.1 FLL Engaged Internal Unlocked
FEI unlocked is a temporary state that is entered when FEI is entered and the count error (∆n) output from
the subtractor is greater than the maximum nunlock or less than the minimum nunlock, as required by the
lock detector to detect the unlock condition.
The ICG will remain in this state while the count error (∆n) is greater than the maximum nlock or less than
the minimum nlock, as required by the lock detector to detect the lock condition.
In this state the output clock signal ICGOUT frequency is given by fICGDCLK / R.
6.3.3.2 FLL Engaged Internal Locked
FLL engaged internal locked is entered from FEI unlocked when the count error (∆n), which comes from
the subtractor, is less than nlock (max) and greater than nlock (min) for a given number of samples, as
required by the lock detector to detect the lock condition. The output clock signal ICGOUT frequency is
given by fICGDCLK / R. In FEI locked, the filter value is only updated once every four comparison cycles.
The update made is an average of the error measurements taken in the four previous comparisons.
6.3.4 FLL Bypassed, External Clock (FBE) Mode
FLL bypassed external (FBE) is entered when any of the following conditions occur:
• From SCM when CLKS = 10 and ERCS is high
• When CLKS = 10, ERCS = 1 upon entering off mode, and off is then exited
• From FLL engaged external mode if a loss of DCO clock occurs and the external reference is still
valid (both LOCS = 1 and ERCS = 1)
In this state, the DCO and IRG are off and the reference clock is derived from the external reference clock,
ICGERCLK. The output clock signal ICGOUT frequency is given by fICGERCLK / R. If an external clock
source is used (REFS = 0), then the input frequency on the EXTAL pin can be anywhere in the range
0 MHz to 40 MHz. If a crystal or resonator is used (REFS = 1), then frequency range is either low for
RANGE = 0 or high for RANGE = 1.
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 91MC9S08GB/GT
6.3.5 FLL Engaged, External Clock (FEE) Mode
The FLL engaged external (FEE) mode is entered when any of the following conditions occur:
• CLKS = 11 and ERCS and DCOS are both high.
• The DCO stabilizes (DCOS = 1) while in SCM upon exiting the off state with CLKS = 11.
In FEE mode, the reference clock is derived from the external reference clock ICGERCLK, and the FLL
loop will attempt to lock the ICGDCLK frequency to the desired value, as selected by the MFD bits. To
run in FEE mode, there must be a working 32 kHz–100 kHz or 2 MHz–10 MHz external clock source. The
maximum external clock frequency is limited to 10 MHz in FEE mode to prevent over-clocking the DCO.
The minimum multiplier for the FLL, from Table 6-8 is 4. Since 4 X 10 MHz is 40MHz, which is the
operational limit of the DCO, the reference clock cannot be any faster than 10 MHz.
6.3.5.1 FLL Engaged External Unlocked
FEE unlocked is entered when FEE is entered and the count error (∆n) output from the subtractor is greater
than the maximum nunlock or less than the minimum nunlock, as required by the lock detector to detect the
unlock condition.
The ICG will remain in this state while the count error (∆n) is greater than the maximum nlock or less than
the minimum nlock, as required by the lock detector to detect the lock condition.
In this state, the pulse counter, subtractor, digital loop filter, and DCO form a closed loop and attempt to
lock it according to their operational descriptions later in this section. Upon entering this state and until
the FLL becomes locked, the output clock signal ICGOUT frequency is given by fICGDCLK / (2×R) This
extra divide by two prevents frequency overshoots during the initial locking process from exceeding
chip-level maximum frequency specifications. Once the FLL has locked, if an unexpected loss of lock
causes it to re-enter the unlocked state while the ICG remains in FEE mode, the output clock signal
ICGOUT frequency is given by fICGDCLK / R.
6.3.5.2 FLL Engaged External Locked
FEE locked is entered from FEE unlocked when the count error (∆n) is less than nlock (max) and greater
than nlock (min) for a given number of samples, as required by the lock detector to detect the lock
condition. The output clock signal ICGOUT frequency is given by fICGDCLK/R. In FLL engaged external
locked, the filter value is only updated once every four comparison cycles. The update made is an average
of the error measurements taken in the four previous comparisons.
6.3.6 FLL Lock and Loss-of-Lock Detection
To determine the FLL locked and loss-of-lock conditions, the pulse counter counts the pulses of the DCO
for one comparison cycle (see Table 6-3 for explanation of a comparison cycle) and passes this number
to the subtractor. The subtractor compares this value to the value in MFD and produces a count error, ∆n.
To achieve locked status, ∆n must be between nlock (min) and nlock (max). Once the FLL has locked, ∆n
must stay between nunlock (min) and nunlock (max) to remain locked. If ∆n goes outside this range
unexpectedly, the LOLS status bit is set and remains set until acknowledged or until the MCU is reset.
Internal Clock Generator (ICG) Module
MC9S08GB/GT92 MOTOROLA
If the ICG enters the off state due to stop mode when ENBDM = OSCSTEN = 0, the FLL loses locked
status (LOCK is cleared), but LOLS remains unchanged because this is not an unexpected loss-of-lock
condition. Though it would be unusual, if ENBDM is cleared to 0 while the MCU is in stop, the ICG enters
the off state. Since this is an unexpected stopping of clocks, LOLS will be set when the MCU wakes up
from stop.
Expected loss of lock occurs when the MFD or CLKS bits are changed or in FEI mode only, when the
TRIM bits are changed. In these cases, the LOCK bit will be cleared until the FLL regains lock, but the
LOLS will not be set.
6.3.7 FLL Loss-of-Clock Detection
Thereference clockand theDCO clock aremonitored underdifferent conditions(see Table6-2). Provided
the reference frequency is being monitored, ERCS = 1 indicates that the reference clock meets minimum
frequency requirements. When the reference and/or DCO clock(s) are being monitored, if either one falls
belowa certain frequency, fLOR and fLOD,respectively, the LOCSstatus bit willbe set to indicate theerror.
LOCS will remain set until it is acknowledged or until the MCU is reset.
If the ICG is in FEE mode when a loss of clock occurs and the ERCS is still set to 1, then the CLKST bits
are set to 10 and the ICG reverts to FBE mode.
A loss of clock will also cause a loss of lock when in FEE or FEI modes. Since the method of clearing the
LOCS and LOLS bits is the same, this would only be an issue in the unlikely case that LOLRE = 1 and
LOCRE = 0. In this case, the interrupt would be overridden by the reset for the loss of lock.
Table 6-2 Clock Monitoring
Mode CLKS REFST ERCS External
Reference Clock
Monitored? DCO Clock
Monitored?
Off
0X or 11 X Forced Low No No
10 0 Forced Low No No
10 1 Real-Time(1)
NOTES:
1. If ENABLE is high (waiting for external crystal start-up after exiting stop).
Yes(1) No
SCM
(CLKST = 00)
0X X Forced Low No Yes(2)
2. DCO clock will not be monitored until DCOS = 1 upon entering SCM from off or FLL bypassed external
mode.
10 0 Forced High No Yes(2)
10 1 Real-Time Yes Yes(2)
11 X Real-Time Yes Yes(2)
FEI
(CLKST = 01) 0X X Forced Low No Yes
11 X Real-Time Yes Yes
FBE
(CLKST = 10) 10 0 Forced High No No
10 1 Real-Time Yes No
FEE
(CLKST = 11) 11 X Real-Time Yes Yes
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 93MC9S08GB/GT
6.3.8 Clock Mode Requirements
A clock mode is requested by writing to CLKS1:CLKS0 and the actual clock mode is indicated by
CLKST1:CLKST0. Provided minimum conditions are met, the status shown in CLKST1:CLKST0 should
be the same as the requested mode in CLKS1:CLKS0. Table 6-3 shows the relationship between CLKS,
CLKST, and ICGOUT. It also shows the conditions for CLKS = CLKST or the reason CLKS ≠ CLKST.
NOTE: If a crystal will be used before the next reset, then be sure to set REFS = 1 and
CLKS = 1x on the first write to the ICGC1 register. Failure to do so will result in
“locking” REFS = 0 which will prevent the oscillator amplifier from being enabled
until the next reset occurs.
Table 6-3 ICG State Table
Actual
Mode
(CLKST)
Desired
Mode
(CLKS) Range Reference
Frequency
(fREFERENCE)Comparison
Cycle Time ICGOUT Conditions(1)
for
CLKS = CLKST
NOTES:
1. CLKST will not update immediately after a write to CLKS. Several bus cycles are required before CLKST updates to the
new value.
Reason
CLKS1 =
CLKST
Off
(XX)
Off
(XX) X0 — 0 — —
FBE
(10) X 0 — 0 — ERCS = 0
SCM
(00)
SCM
(00) XfICGIRCLK/7(2)
2. The reference frequency has no effect on ICGOUT in SCM, but the reference frequency is still used in making the
comparisons that determine the DCOS bit
8/fICGIRCLK ICGDCLK/R Not switching from
FBE to SCM —
FEI
(01) 0fICGIRCLK/7(1) 8/fICGIRCLK ICGDCLK/R — DCOS = 0
FBE
(10) XfICGIRCLK/7(1) 8/fICGIRCLK ICGDCLK/R — ERCS = 0
FEE
(11) XfICGIRCLK/7(1) 8/fICGIRCLK ICGDCLK/R — DCOS = 0 or
ERCS = 0
FEI
(01)
FEI
(01) 0fICGIRCLK/7 8/fICGIRCLK ICGDCLK/R DCOS = 1 —
FEE
(11) XfICGIRCLK/7 8/fICGIRCLK ICGDCLK/R — ERCS = 0
FBE
(10)
FBE
(10) X 0 — ICGERCLK/R ERCS = 1 —
FEE
(11) X 0 — ICGERCLK/R — LOCS = 1 &
ERCS = 1
FEE
(11) FEE
(11)
0fICGERCLK 2/fICGERCLK ICGDCLK/R(3)
3. After initial LOCK; will be ICGDCLK/2R during initial locking process and while FLL is re-locking after the MFD bits are
changed.
ERCS = 1 and
DCOS = 1 —
1fICGERCLK 128/fICGERCLK ICGDCLK/R(2) ERCS = 1 and
DCOS = 1 —
Internal Clock Generator (ICG) Module
MC9S08GB/GT94 MOTOROLA
6.4 Initialization/Application Information
6.4.1 Introduction
The section is intended to give some basic direction on which configuration a user would want to select
when initializing the ICG. For some applications, the serial communication link may dictate the accuracy
of the clock reference. For other applications, lowest power consumption may be the chief clock
consideration. Still others may have lowest cost as the primary goal. The ICG allows great flexibility in
choosing which is best for any application.
The following sections contain initialization examples for various configurations.
NOTE: Hexadecimal values designated by a preceding $, binary values designated by a
preceding %, and decimal values have no preceding character.
Important configuration information is repeated here for reference sake.
Table 6-4 ICG Configuration Consideration
Clock Reference Source = Internal Clock Reference Source = External
FLL
Engaged
FEI
4 MHz < fBus < 20 MHz.
Medium power (will be less than FEE if oscillator
range = high)
Medium clock accuracy (After IRG is trimmed)
Lowest system cost (no external components
required)
IRG is on. DCO is on. (1)
NOTES:
1. The IRG typically consumes 100 µA. The FLL and DCO typically consumes 0.5 to 2.5 mA, depending upon output
frequency. For minimum power consumption and minimum jitter, choose N and R to be as small as possible.
FEE
4 MHz < fBus < 20 MHz
Medium power (will be less than FEI if oscillator
range = low)
Good clock accuracy
Medium/High system cost (crystal, resonator or
external clock source required)
IRG is off. DCO is on.
FLL
Bypassed
SCM
This mode is mainly provided for quick and reliable
system startup.
3 MHz < fBus < 5 MHz (default).
3 MHz < fBus < 20 MHz (via filter bits).
Medium power
Poor accuracy.
IRG is off. DCO is on and open loop.
FBE
fBus range <= 8 MHz when crystal or resonator is
used.
Lowest power
Highest clock accuracy
Medium/High system cost (Crystal, resonator or
external clock source required)
IRG is off. DCO is off.
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 95MC9S08GB/GT
Figure 6-7 ICG Register Set
Table 6-5 ICGOUT Frequency Calculation Options
Clock Scheme fICGOUT P Note
SCM — self-clocked mode (FLL bypassed
internal) fICGDCLK / R NA Typical fICGOUT =
8 MHz out of reset
FBE — FLL bypassed external fext / R NA
FEI — FLL engaged internal (fIRG / 7)* 64*N / R 64 Typical fIRG = 243 kHz
4≤ N = 18
FEE — FLL engaged external fext * P * N / R Range = 0 ; P = 64
Range = 1; P = 1 4 <= N <= 18
1 <= R <= 128
Table 6-6 MFD and RFD Decode Table
MFD Value Multiplication Factor (N) RFD Division Factor (R)
000 4 000 ÷1
001 6 001 ÷2
010 8 010 ÷4
011 10 011 ÷8
100 12 100 ÷16
101 14 101 ÷32
110 16 110 ÷64
111 18 111 ÷128
Register Bit 7 654321Bit 0
ICGC1 0 RANGE REFS CLKS OSCSTEN 0(1)
NOTES:
1. This bit is reserved for Motorola internal use only. Any write operations to this register should write a 0 to
this bit.
0
ICGC2 LOLRE MFD LOCRE RFD
ICGS1 CLKST REFST LOLS LOCK LOCS ERCS ICGIF
ICGS2 0 0 0 0 0 0 0 DCOS
ICGFLTU 0 0 0 0 FLT
ICGFLTL FLT
ICGTRM TRIM
= Unimplemented or Reserved
Internal Clock Generator (ICG) Module
MC9S08GB/GT96 MOTOROLA
6.4.2 Example #1: External Crystal = 32 kHz, Bus Frequency = 4.19 MHz
In this example, the FLL will be used (in FEE mode) to multiply the external 32 kHz oscillator up to
8.38-MHz to achieve 4.19 MHz bus frequency.
After the MCU is released from reset, the ICG is in self-clocked mode (SCM) and supplies approximately
8 MHz on ICGOUT, which corresponds to a 4 MHz bus frequency (fBus).
The clock scheme will be FLL engaged, external (FEE). So
fICGOUT = fext * P * N / R ; P = 64, fext = 32 kHz
Solving for N / R gives:
N / R = 8.38 MHz /(32 kHz * 64) = 4 ; we can choose N = 4 and R =1
The values needed in each register to set up the desired operation are:
ICGC1 = $38 (%00111000)
Bit 7 0 Unimplemented or reserved, always reads zero
Bit 6 RANGE 0 Configures oscillator for low-frequency range; FLL prescale factor is 64
Bit 5 REFS 1 Oscillator using crystal or resonator is requested
Bits 4:3 CLKS 11 FLL engaged, external reference clock mode
Bit 2 OSCSTEN 0 Oscillator disabled
Bit 1 0 Reserved for Motorola’s internal use; always write zero
Bit 0 0 Unimplemented or reserved, always reads zero
ICGC2 = $00 (%00000000)
Bit 7 LOLRE 0 Generates an interrupt request on loss of lock
Bits 6:4 MFD 000 Sets the MFD multiplication factor to 4
Bit 3 LOCRE 0 Generates an interrupt request on loss of clock
Bits 2:0 RFD 000 Sets the RFD division factor to ÷2
ICGS1 = $xx
This is read only except for clearing interrupt flag
ICGS2 = $xx
This is read only; should read DCOS = 1 before performing any time critical tasks
ICGFLTLU/L = $xx
Only needed in self-clocked mode; FLT will be adjusted by loop to give 8.38 MHz DCO clock
Bits 15:12 unused 0000
Bits 11:0 FLT No need for user initialization
ICGTRM = $xx
Bits 7:0 TRIM Only need to write when trimming internal oscillator; not used when external
crystal is clock source
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 97MC9S08GB/GT
Figure 6-8 shows flow charts for three conditions requiring ICG initialization.
Figure 6-8 ICG Initialization for FEE in Example #1
RESET
CONTINUE
RECOVERY FROM STOP
CHECK
LOCK = 1?
NO
YES
FLL LOCK STATUS.
INITIALIZE ICG
ICG1 = $38
ICG2 = $00
RECOVERY FROM STOP
OSCSTEN = 1 OSCSTEN = 0
CONTINUE
CHECK
LOCK = 1?
NO
YES
FLL LOCK STATUS.
CONTINUE
CHECK
LOCK = 1?
NO
YES
FLL LOCK STATUS.
NOTE: THIS WILL REQUIRE THE OSCILLATOR TO START AND
STABILIZE. ACTUAL TIME IS DEPENDENT ON CRYSTAL /RESONATOR
AND EXTERNAL CIRCUITRY.
QUICK RECOVERY FROM STOP MINIMUM CURRENT DRAW IN STOP
Internal Clock Generator (ICG) Module
MC9S08GB/GT98 MOTOROLA
6.4.3 Example #2: External Crystal = 4 MHz, Bus Frequency = 20 MHz
In this example, the FLL will be used (in FEE mode) to multiply the external 4 MHz oscillator up to
40-MHz to achieve 20 MHz bus frequency.
After the MCU is released from reset, the ICG is in self-clocked mode (SCM) and supplies approximately
8 MHz on ICGOUT which corresponds to a 4 MHz bus frequency (fBus).
During reset initialization software, the clock scheme will be set to FLL engaged, external (FEE). So
fICGOUT = fext * P * N / R ; P = 1, fext = 4.00 MHz
Solving for N / R gives:
N / R = 40 MHz /(4 MHz * 1) = 10 ; We can choose N = 10 and R = 1
The values needed in each register to set up the desired operation are:
ICGC1 = $78 (%01111000)
Bit 7 0 Unimplemented or reserved, always reads zero
Bit 6 RANGE 1 Configures oscillator for high-frequency range; FLL prescale factor is 1
Bit 5 REFS 1 Requests an oscillator
Bits 4:3 CLKS 11 FLL engaged, external reference clock mode
Bit 2 OSCSTEN 0 Disables the oscillator
Bit 1 0 Reserved for Motorola’s internal use; always write zero
Bit 0 0 Unimplemented or reserved, always reads zero
ICGC2 = $30 (%00110000)
Bit 7 LOLRE 0 Generates an interrupt request on loss of lock
Bit 6:4 MFD 011 Sets the MFD multiplication factor to 10
Bit 3 LOCRE 0 Generates an interrupt request on loss of clock
Bit 2:0 RFD 000 Sets the RFD division factor to ÷1
ICGS1 = $xx
This is read only except for clearing interrupt flag
ICGS2 = $xx
This is read only. Should read DCOS before performing any time critical tasks
ICGFLTLU/L = $xx
Not used in this example
ICGTRM
Not used in this example
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 99MC9S08GB/GT
Figure 6-9 ICG Initialization and Stop Recovery for Example #2
RESET
CONTINUE
RECOVERY
CHECK
LOCK = 1?
NO
YES
FLL LOCK STATUS
INITIALIZE ICG
ICG1 = $7A
ICG2 = $30
CONTINUE
CHECK
LOCK = 1?
NO
YES
FLL LOCK STATUS
SERVICE INTERRUPT
SOURCE (fBus = 4 MHz)
FROM STOP
Internal Clock Generator (ICG) Module
MC9S08GB/GT100 MOTOROLA
6.4.4 Example #3: No External Crystal Connection, 5.4 MHz Bus Frequency
In this example, the FLL will be used (in FEI mode) to multiply the internal 243 kHz (approximate)
reference clock up to 10.8 MHz to achieve 5.4 MHz bus frequency. This system will also use the trim
function to fine tune the frequency based on an external reference signal.
After the MCU is released from reset, the ICG is in self-clocked mode (SCM) and supplies approximately
8 MHz on ICGOUT which corresponds to a 4 MHz bus frequency (fBus).
The clock scheme will be FLL engaged, internal (FEI). So
fICGOUT = (fIRG / 7) * P * N / R ; P = 64, fIRG = 243 kHz
Solving for N / R gives:
N / R = 10.8 MHz /(243/7 kHz * 64) = 4.86 ; We can choose N = 10 and R = 2.
A trim procedure will be required to hone the frequency to exactly 5.4 MHz. An example of the trim
procedure is shown in example #4.
The values needed in each register to set up the desired operation are:
ICGC1 = $28 (%00101000)
Bit 7 0 Unimplemented or reserved, always reads zero
Bit 6 RANGE 0 Configures oscillator for low-frequency range; FLL prescale factor is 64
Bit 5 REFS 1 Oscillator using crystal or resonator requested (bit is really a don’t care)
Bits 4:3 CLKS 01 FLL engaged, internal reference clock mode
Bit 2 OSCSTEN 0 Disables the oscillator
Bit 1 0 Reserved for Motorola’s internal use; always write zero
Bit 0 0 Unimplemented or reserved, always reads zero
ICGC2 = $31 (%00110001)
Bit 7 LOLRE 0 Generates an interrupt request on loss of lock
Bit 6:4 MFD 011 Sets the MFD multiplication factor to 10
Bit 3 LOCRE 0 Generates an interrupt request on loss of clock
Bit 2:0 RFD 001 Sets the RFD division factor to ÷2
ICGS1 = $xx
This is read only except for clearing interrupt flag
ICGS2 = $xx
This is read only; good idea to read this before performing time critical operations
ICGFLTLU/L = $xx
Not used in this example
ICGTRM = $xx
Bit 7:0 TRIM Only need to write when trimming internal oscillator; done in separate
operation (see example #4)
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 101MC9S08GB/GT
Figure 6-10 ICG Initialization and Stop Recovery for Example #3
RESET
CONTINUE
CHECK
LOCK = 1?
NO
YES
FLL LOCK STATUS.
INITIALIZE ICG
ICG1 = $28
ICG2 = $31
RECOVERY
CONTINUE
CHECK
LOCK = 1?
NO
YES
FLL LOCK STATUS.
NOTE: THIS WILL REQUIRE THE INTERAL REFERENCE CLOCK TO START AND
STABILIZE.
FROM STOP
Internal Clock Generator (ICG) Module
MC9S08GB/GT102 MOTOROLA
6.4.5 Example #4: Internal Clock Generator Trim
The internally generated clock source is guaranteed to have a period ±25% of the nominal value. In some
case this may be sufficient accuracy. For other applications that require a tight frequency tolerance, a
trimming procedure is provided that will allow a very accurate source. This section outlines one example
of trimming the internal oscillator. Many other possible trimming procedures are valid and can be used.
Figure 6-11 Trim Procedure
In this particular case, the MCU has been attached to a PCB and the entire assembly is undergoing final
test with automated test equipment. A separate signal or message is provided to the MCU operating under
user provided software control. The MCU initiates a trim procedure as outlined in Figure 6-11 while the
tester supplies a precision reference signal.
If the intended bus frequency is near the maximum allowed for the device, it is recommended to trim using
a reduction divisor (R) twice the final value. Once the trim procedure is complete, the reduction divisor
can be restored. This will prevent accidental overshoot of the maximum clock frequency.
Initial conditions:
1) Clock supplied from ATE has 500 µsec duty period
2) ICG configured for internal reference with 4 MHz bus
START TRIM PROCEDURE
CONTINUE
CASE STATEMENT
COUNT < EXPECTED = 500
.
MEASURE
INCOMING CLOCK WIDTH
ICGTRM = $80, n = 1
COUNT > EXPECTED = 500
COUNT = EXPECTED = 500
STORE ICGTRM VALUE
IN NON-VOLATILE
MEMORY
ICGTRM =
ICGTRM =
ICGTRM - 128 / (2**n) ICGTRM + 128 / (2**n)
n = n + 1
(COUNT = # OF BUS CLOCKS / 4)
(DECREASING ICGTRM
INCREASES THE FREQUENCY)
(INCREASING ICGTRM
DECREASES THE FREQUENCY)
NO
YES
IS n > 8?
(RUNNING TOO SLOW)
(RUNNING TOO FAST)
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 103MC9S08GB/GT
6.5 ICG Registers and Control Bits
Refer to the direct-page register summary in the Memorysection of this data sheet for the absolute address
assignments for all ICG registers. This section refers to registers and control bits only by their names. A
Motorola-provided equate or header file is used to translate these names into the appropriate absolute
addresses.
6.5.1 ICG Control Register 1 (ICGC1)
Figure 6-12 ICG Control Register 1 (ICGC1)
RANGE — Frequency Range Select
The RANGE bit controls the oscillator, reference divider, and FLL loop prescaler multiplication factor
(P). It selects one of two reference frequency ranges for the ICG. The RANGE bit is write-once after
a reset. The RANGE bit only has an effect in FLL engaged external and FLL bypassed external modes.
1 = Oscillator configured for high frequency range. FLL loop prescale factor P is 1.
0 = Oscillator configured for low frequency range. FLL loop prescale factor P is 64.
REFS — External Reference Select
The REFS bit controls the external reference clock source for ICGERCLK. The REFS bit is write-once
after a reset.
1 = Oscillator using crystal or resonator requested.
0 = External clock requested.
CLKS — Clock Mode Select
The CLKS bits control the clock mode according to Table 6-7. If FLL bypassed external is requested,
it will not be selected until ERCS = 1. If the ICG enters off mode, the CLKS bits will remain
unchanged.Writes to the CLKS bits will not take effect if a previous write is not complete.
Bit 7 654321Bit 0
Read: 0
RANGE REFS CLKS OSCSTEN R(1)
NOTES:
1. This bit is reserved for Motorola internal use only. Any write operations to this register should write a 0 to
this bit.
0
Write:
Reset: 01000100
= Unimplemented or Reserved
Internal Clock Generator (ICG) Module
MC9S08GB/GT104 MOTOROLA
The CLKS bits are writable at any time, unless the first write after a reset was CLKS = 0X, the CLKS bits
cannot be written to 1X until after the next reset (because the EXTAL pin was not reserved).
OSCSTEN — Enable Oscillator in Off Mode
The OSCSTEN bit controls whether or not the oscillator circuit remains enabled when the ICG enters
off mode.
1 = Oscillator enabled when ICG is in off mode, CLKS = 1X and REFST = 1.
0 = Oscillator disabled when ICG is in off mode unless ENABLE is high, CLKS = 10, and
REFST = 1.
6.5.2 ICG Control Register 2 (ICGC2)
Figure 6-13 ICG Control Register 2 (ICGC2)
LOLRE — Loss of Lock Reset Enable
TheLOLRE bit determines whattype of request is made by theICG following a lossof lock indication.
The LOLRE bit only has an effect when LOLS is set.
1 = Generate a reset request on loss of lock.
0 = Generate an interrupt request on loss of lock.
MFD — Multiplication Factor
The MFD bits control the programmable multiplication factor in the FLL loop. The value specified by
the MFD bits establishes the multiplication factor (N) applied to the reference frequency. Writes to the
MFD bits will not take effect if a previous write is not complete.
Table 6-7 CLKS Clock Select
CLKS[1:0] Clock Mode
00 Self-clocked
01 FLL engaged, internal reference
10 FLL bypassed, external reference
11 FLL engaged, external reference
Bit 7 654321Bit 0
Read:
LOLRE MFD LOCRE RFD
Write:
Reset: 00000000
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 105MC9S08GB/GT
LOCRE — Loss of Clock Reset Enable
The LOCRE bit determines how the system handles a loss of clock condition.
1 = Generate a reset request on loss of clock.
0 = Generate an interrupt request on loss of clock.
RFD — Reduced Frequency Divider
The RFD bits control the value of the divider following the clock select circuitry. The value specified
by the RFD bits establishes the division factor (R) applied to the selected output clock source. Writes
to the RFD bits will not take effect if a previous write is not complete.
Table 6-8 MFD Multiplication Factor Select
MFD
Value Multiplication Factor (N)
000 4
001 6
010 8
011 10
100 12
101 14
110 16
111 18
Table 6-9 RFD Reduced Frequency Divider Select
RFD Division Factor (R)
000 ÷1
001 ÷2
010 ÷4
011 ÷8
100 ÷16
101 ÷32
110 ÷64
111 ÷128
Internal Clock Generator (ICG) Module
MC9S08GB/GT106 MOTOROLA
6.5.3 ICG Status Register 1 (ICGS1)
Figure 6-14 ICG Status Register 1 (ICGS1)
CLKST — Clock Mode Status
The CLKST bits indicate the current clock mode. The CLKST bits don’t update immediately after a
write to the CLKS bits due to internal synchronization between clock domains.
REFST — Reference Clock Status
The REFST bit indicates which clock reference is currently selected by the Reference Select circuit.
1 = Crystal/Resonator selected.
0 = External Clock selected.
LOLS — FLL Loss of Lock Status
The LOLS bit is a sticky indication of FLL lock status.
1 = FLL has unexpectedly lost lock since LOLS was last cleared, LOLRE determines action taken.
0 = FLL has not unexpectedly lost lock since LOLS was last cleared.
LOCK — FLL Lock Status
The LOCK bit indicates whether the FLL has acquired lock. The LOCK bit is cleared in off,
self-clocked, and FLL bypassed modes.
1 = FLL is currently locked.
0 = FLL is currently unlocked.
Bit 7 654321Bit 0
Read: CLKST REFST LOLS LOCK LOCS ERCS ICGIF
Write: 1
Reset: 00000000
= Unimplemented or Reserved
Table 6-10 CLKST Clock Mode Status
CLKST[1:0] Clock Status
00 Self-clocked
01 FLL engaged, internal reference
10 FLL bypassed, external reference
11 FLL engaged, external reference
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 107MC9S08GB/GT
LOCS — Loss Of Clock Status
The LOCS bit is an indication of ICG loss of clock status.
1 = ICG has lost clock since LOCS was last cleared, LOCRE determines action taken.
0 = ICG has not lost clock since LOCS was last cleared.
ERCS — External Reference Clock Status
The ERCS bit is an indication of whether or not the external reference clock (ICGERCLK) meets the
minimum frequency requirement.
1 = External reference clock is stable, frequency requirement is met.
0 = External reference clock is not stable, frequency requirement is not met.
ICGIF — ICG Interrupt Flag
The ICGIF read/write flag is set when an ICG interrupt request is pending. It is cleared by a reset or
by reading the ICG status register when ICGIF is set and then writing a logic 1 to ICGIF. If another
ICG interrupt occurs before the clearing sequence is complete, the sequence is reset so ICGIF would
remain set after the clear sequence was completed for the earlier interrupt. Writing a logic 0 to ICGIF
has no effect.
1 = An ICG interrupt request is pending.
0 = No ICG interrupt request is pending.
6.5.4 ICG Status Register 2 (ICGS2)
Figure 6-15 ICG Status Register 2 (ICGS2)
DCOS — DCO Clock Stable
The DCOS bit is set when the DCO clock (ICG2DCLK) is stable, meaning the count error has not
changed by more than nunlock for two consecutive samples and the DCO clock is not static. This bit is
used when exiting off state if CLKS = X1 to determine when to switch to the requested clock mode. It
is also used in self-clocked mode to determine when to start monitoring the DCO clock. This bit is
cleared upon entering the off state.
1 = DCO clock is stable.
0 = DCO clock is unstable.
Bit 7 654321Bit 0
Read: 0000000DCOS
Write:
Reset: 00000000
= Unimplemented or Reserved
Internal Clock Generator (ICG) Module
MC9S08GB/GT108 MOTOROLA
6.5.5 ICG Filter Registers (ICGFLTU, ICGFLTL)
Figure 6-16 ICG Upper Filter Register (ICGFLTU)
Figure 6-17 ICG Lower Filter Register (ICGFLTL)
The filter registers show the filter value (FLT).
FLT — Filter Value
The FLT bits indicate the current filter value, which controls the DCO frequency. The FLT bits are
read only except when the CLKS bits are programmed to self-clocked mode (CLKS = 00). In
self-clocked mode, any write to ICGFLTU updates the current 12-bit filter value. Writes to the
ICGFLTU register will not affect FLT if a previous latch sequence is not complete.
6.5.6 ICG Trim Register (ICGTRM)
Figure 6-18 ICG Trim Register (ICGTRM)
TRIM — ICG Trim Setting
The TRIM bits control the internal reference generator frequency. They allow a ±25% adjustment of
the nominal (POR) period. The bit’s effect on period is binary weighted (i.e., bit 1 will adjust twice as
much as changing bit 0). Increasing the binary value in TRIM will increase the period and decreasing
the value will decrease the period.
Bit 15 14 13 12 11 10 9 Bit 8
Read: 0000 FLT
Write:
Reset: 00000000
= Unimplemented or Reserved
Bit 7 654321Bit 0
Read: FLT
Write:
Reset: 11000000
76543210
Read: TRIM
Write:
POR: 10000000
Reset: UUUUUUUU
U = Unaffected by MCU reset
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 109MC9S08GB/GT
Section 7 Central Processor Unit (CPU)
7.1 Introduction
This section provides summary information about the registers, addressing modes, and instruction set of
the CPU of the HCS08 Family. For a more detailed discussion, refer to the HCS08 Family Reference
Manual, volume 1, Motorola document order number HCS08RMv1/D.
The HCS08 CPU is fully source- and object-code-compatible with the M68HC08 CPU. Several
instructions and enhanced addressing modes were added to improve C compiler efficiency and to support
a new background debug system which replaces the monitor mode of earlier M68HC08 microcontrollers
(MCU).
Central Processor Unit (CPU)
MC9S08GB/GT110 MOTOROLA
7.2 Features
Features of the HCS08 CPU include:
• Object code fully upward-compatible with M68HC05 and M68HC08 Families
• All registers and memory are mapped to a single 64-Kbyte address space
• 16-bit stack pointer (any size stack anywhere in 64-Kbyte address space)
• 16-bit index register (H:X) with powerful indexed addressing modes
• 8-bit accumulator (A)
• Many instructions treat X as a second general-purpose 8-bit register
• Seven addressing modes:
– Inherent — Operands in internal registers
– Relative — 8-bit signed offset to branch destination
– Immediate — Operand in next object code byte(s)
– Direct — Operand in memory at $0000–$00FF
– Extended — Operand anywhere in 64-Kbyte address space
– Indexed relative to H:X — Five submodes including auto increment
– Indexed relative to SP — Improves C efficiency dramatically
• Memory-to-memory data move instructions with four address mode combinations
• Overflow, half-carry, negative, zero, and carry condition codes support conditional branching on
the results of signed, unsigned, and binary-coded decimal (BCD) operations
• Efficient bit manipulation instructions
• Fast 8-bit by 8-bit multiply and 16-bit by 8-bit divide instructions
• STOP and WAIT instructions to invoke low-power operating modes
7.3 Programmer’s Model and CPU Registers
Figure 7-1 shows the five CPU registers. CPU registers are not part of the memory map.
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 111MC9S08GB/GT
Figure 7-1 CPU Registers
7.3.1 Accumulator (A)
The A accumulator is a general-purpose 8-bit register. One operand input to the arithmetic logic unit
(ALU) is connected to the accumulator and the ALU results are often stored into the A accumulator after
arithmetic and logical operations. The accumulator can be loaded from memory using various addressing
modes to specify the address where the loaded data comes from, or the contents of A can be stored to
memory using various addressing modes to specify the address where data from A will be stored.
Reset has no effect on the contents of the A accumulator.
7.3.2 Index Register (H:X)
This 16-bit register is actually two separate 8-bit registers (H and X) which often work together as a 16-bit
address pointer where H holds the upper byte of an address and X holds the lower byte of the address. All
indexed addressing mode instructions use the full 16-bit value in H:X as an index reference pointer;
however, for compatibility with the earlier M68HC05 Family, some instructions operate only on the
low-order 8-bit half (X).
Many instructions treat X as a second general-purpose 8-bit register which can be used to hold 8-bit data
values. X can be cleared, incremented, decremented, complemented, negated, shifted, or rotated. Transfer
instructions allow data to be transferred from A or transferred to A where arithmetic and logical operations
can then be performed.
For compatibility with the earlier M68HC05 Family, H is forced to $00 during reset. Reset has no effect
on the contents of X.
SP
PC
CONDITION CODE REGISTER
CARRY
ZERO
NEGATIVE
INTERRUPT MASK
HALF-CARRY (FROM BIT 3)
TWO’S COMPLEMENT OVERFLOW
H X
0
0
0
7
15
15
70
ACCUMULATOR A
INDEX REGISTER (LOW)INDEX REGISTER (HIGH)
STACK POINTER
87
PROGRAM COUNTER
16-BIT INDEX REGISTER H:X
CCR
CV11HINZ
Central Processor Unit (CPU)
MC9S08GB/GT112 MOTOROLA
7.3.3 Stack Pointer (SP)
This 16-bit address pointer register points at the next available location on the automatic last-in-first-out
(LIFO) stack. The stack may be located anywhere in the 64-Kbyte address space which has RAM and can
be any size up to the amount of available RAM. The stack is used to automatically save the return address
for subroutine calls, the return address and CPU registers during interrupts, and for local variables. The
AIS (add immediate to stack pointer) instruction adds an 8-bit signed immediate value to SP. This is most
often used to allocate or deallocate space for local variables on the stack.
SP is forced to $00FF at reset for compatibility with the earlier M68HC05 Family. HCS08 programs
normally change the value in SP to the address of the last location (highest address) in on-chip RAM
during reset initialization to free up direct page RAM (from the end of the on-chip registers to $00FF).
The RSP (reset stack pointer) instruction was included for compatibility with the M68HC05 Family and
is seldom used in new HCS08 programs because it only affects the low-order half of the stack pointer.
7.3.4 Program Counter (PC)
The program counter is a 16-bit register that contains the address of the next instruction or operand to be
fetched.
During normal program execution, the program counter automatically increments to the next sequential
memory location every time an instruction or operand is fetched. Jump, branch, interrupt, and return
operations load the program counter with an address other than that of the next sequential location. This
is called a change-of-flow.
During reset, the program counter is loaded with the reset vector which is located at $FFFE and $FFFF.
The vector stored there is the address of the first instruction that will be executed after exiting the reset
state.
7.3.5 Condition Code Register (CCR)
The 8-bit condition code register contains the interrupt mask (I) and five flags that indicate the results of
the instruction just executed. Bits 6 and 5 are set permanently to logic 1. The following paragraphs
describe the functions of the condition code bits in general terms. For a more detailed explanation of how
each instruction sets the CCR bits, refer to the HCS08 Family Reference Manual, volume 1, Motorola
document order number HCS08RMv1/D.
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 113MC9S08GB/GT
Figure 7-2 Condition Code Register
V — Two’s Complement Overflow Flag
The CPU sets the overflow flag when a two’s complement overflow occurs. The signed branch
instructions BGT, BGE, BLE, and BLT use the overflow flag.
1 = Overflow
0 = No overflow
H — Half-Carry Flag
The CPU sets the half-carry flag when a carry occurs between accumulator bits 3 and 4 during an
add-without-carry (ADD) or add-with-carry (ADC) operation. The half-carry flag is required for
binary-coded decimal (BCD) arithmetic operations. The DAA instruction uses the states of the H and
C condition code bits to automatically add a correction value to the result from a previous ADD or
ADC on BCD operands to correct the result to a valid BCD value.
1 = Carry between bits 3 and 4
0 = No carry between bits 3 and 4
I — Interrupt Mask Bit
When the interrupt mask is set, all maskable CPU interrupts are disabled. CPU interrupts are enabled
when the interrupt mask is cleared. When a CPU interrupt occurs, the interrupt mask is set
automatically after the CPU registers are saved on the stack, but before the first instruction of the
interrupt service routine is executed.
1 = Interrupts disabled
0 = Interrupts enabled
Interrupts are not recognized at the instruction boundary after any instruction which clears I (CLI or
TAP). This ensures that the next instruction after a CLI or TAP will always be executed without the
possibility of an intervening interrupt, provided I was set.
N — Negative Flag
The CPU sets the negative flag when an arithmetic operation, logic operation, or data manipulation
produces a negative result, setting bit 7 of the result. Simply loading or storing an 8-bit or 16-bit value
causes N to be set if the most significant bit of the loaded or stored value was 1.
1 = Negative result
0 = Non-negative result
CONDITION CODE REGISTER
CARRY
ZERO
NEGATIVE
INTERRUPT MASK
HALF-CARRY (FROM BIT 3)
TWO’S COMPLEMENT OVERFLOW
70
CCR
CV11HINZ
Central Processor Unit (CPU)
MC9S08GB/GT114 MOTOROLA
Z — Zero Flag
The CPU sets the zero flag when an arithmetic operation, logic operation, or data manipulation
produces a result of $00 or $0000. Simply loading or storing an 8-bit or 16-bit value causes Z to be set
if the loaded or stored value was all 0s.
1 = Zero result
0 = Non-zero result
C — Carry/Borrow Flag
The CPU sets the carry/borrow flag when an addition operation produces a carry out of bit 7 of the
accumulator or when a subtraction operation requires a borrow. Some instructions — such as bit test
and branch, shift, and rotate — also clear or set the carry/borrow flag.
1 = Carry out of bit 7
0 = No carry out of bit 7
7.4 Addressing Modes
Addressing modes define the way the CPU accesses operands and data. In the HCS08, all memory, status
and control registers, and input/output (I/O) ports share a single 64-Kbyte linear address space so a 16-bit
binary address can uniquely identify any memory location. This arrangement means that the same
instructions that access variables in RAM can also be used to access I/O and control registers or
nonvolatile program space.
Some instructions use more than one addressing mode. For instance, move instructions use one addressing
mode to specify the source operand and a second addressing mode to specify the destination address.
Instructions such as BRCLR, BRSET, CBEQ, and DBNZ use one addressing mode to specify the location
of an operand for a test and then use relative addressing mode to specify the branch destination address
when the tested condition is true. For BRCLR, BRSET, CBEQ, and DBNZ, the addressing mode listed in
the instruction set tables is the addressing mode needed to access the operand to be tested, and relative
addressing mode is implied for the branch destination.
7.4.1 Inherent Addressing Mode (INH)
In this addressing mode, operands needed to complete the instruction (if any) are located within CPU
registers so the CPU does not need to access memory to get any operands.
7.4.2 Relative Addressing Mode (REL)
Relative addressing mode is used to specify the destination location for branch instructions. A signed 8-bit
offset value is located in the memory location immediately following the opcode. During execution, if the
branch condition is true, the signed offset is sign-extended to a 16-bit value and is added to the current
contents of the program counter which causes program execution to continue at the branch destination
address.
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 115MC9S08GB/GT
7.4.3 Immediate Addressing Mode (IMM)
In immediate addressing mode, the operand needed to complete the instruction is included in the object
code immediately following the instruction opcode in memory. In the case of a 16-bit immediate operand,
the high-order byte is located in the next memory location after the opcode, and the low-order byte is
located in the next memory location after that.
7.4.4 Direct Addressing Mode (DIR)
In direct addressing mode, the instruction includes the low-order eight bits of an address in the direct page
($0000–$00FF). During execution a 16-bit address is formed by concatenating an implied $00 for the
high-order half of the address and the direct address from the instruction to get the 16-bit address where
the desired operand is located. This is faster and more memory efficient than specifying a complete 16-bit
address for the operand.
7.4.5 Extended Addressing Mode (EXT)
In extended addressing mode, the full 16-bit address of the operand is located in the next two bytes of
program memory after the opcode (high byte first).
7.4.6 Indexed Addressing Mode
Indexed addressing mode has seven variations including five which use the 16-bit H:X index register pair
and two that use the stack pointer as the base reference.
7.4.6.1 Indexed, No Offset (IX)
This variation of indexed addressing uses the 16-bit value in the H:X index register pair as the address of
the operand needed to complete the instruction.
7.4.6.2 Indexed, No Offset with Post Increment (IX+)
This variation of indexed addressing uses the 16-bit value in the H:X index register pair as the address of
the operand needed to complete the instruction. The index register pair is then incremented
(H:X = H:X + $0001) after the operand has been fetched. This addressing mode is only used for MOV and
CBEQ instructions.
7.4.6.3 Indexed, 8-Bit Offset (IX1)
This variation of indexed addressing uses the 16-bit value in the H:X index register pair plus an unsigned
8-bit offset included in the instruction as the address of the operand needed to complete the instruction.
7.4.6.4 Indexed, 8-Bit Offset with Post Increment (IX1+)
This variation of indexed addressing uses the 16-bit value in the H:X index register pair plus an unsigned
8-bit offset included in the instruction as the address of the operand needed to complete the instruction.
Central Processor Unit (CPU)
MC9S08GB/GT116 MOTOROLA
The index register pair is then incremented (H:X = H:X + $0001) after the operand has been fetched. This
addressing mode is used only for the CBEQ instruction.
7.4.6.5 Indexed, 16-Bit Offset (IX2)
This variation of indexed addressing uses the 16-bit value in the H:X index register pair plus a 16-bit offset
included in the instruction as the address of the operand needed to complete the instruction.
7.4.6.6 SP-Relative, 8-Bit Offset (SP1)
This variation of indexed addressing uses the 16-bit value in the stack pointer (SP) plus an unsigned 8-bit
offset included in the instruction as the address of the operand needed to complete the instruction.
7.4.6.7 SP-Relative, 16-Bit Offset (SP2)
This variation of indexed addressing uses the 16-bit value in the stack pointer (SP) plus a 16-bit offset
included in the instruction as the address of the operand needed to complete the instruction.
7.5 Special Operations
The CPU performs a few special operations which are similar to instructions but do not have opcodes like
other CPU instructions. In addition, a few instructions such as STOP and WAIT directly affect other MCU
circuitry. This section provides additional information about these operations.
7.5.1 Reset Sequence
Reset can be caused by a power-on-reset (POR) event, internal conditions such as the COP (computer
operating properly) watchdog, or by assertion of an external active-low reset pin. When a reset event
occurs, the CPU immediately stops whatever it is doing (the MCU does not wait for an instruction
boundary before responding to a reset event). For a more detailed discussion about how the MCU
recognizes resets and determines the source, refer to the Resets, Interrupts, and System Configuration
section.
The reset event is considered concluded when the sequence to determine whether the reset came from an
internal source is done and when the reset pin is no longer asserted. At the conclusion of a reset event, the
CPU performs a 6-cycle sequence to fetch the reset vector from $FFFE and $FFFF and to fill the
instruction queue in preparation for execution of the first program instruction.
7.5.2 Interrupt Sequence
When an interrupt is requested, the CPU completes the current instruction before responding to the
interrupt. At this point, the program counter is pointing at the start of the next instruction which is where
the CPU should return after servicing the interrupt. The CPU responds to an interrupt by performing the
same sequence of operations as for a software interrupt (SWI) instruction, except the address used for the
vector fetch is determined by the highest priority interrupt that is pending when the interrupt sequence
started.
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 117MC9S08GB/GT
The CPU sequence for an interrupt is:
1. Store the contents of PCL, PCH, X, A, and CCR on the stack, in that order.
2. Set the I bit in the CCR.
3. Fetch the high-order half of the interrupt vector.
4. Fetch the low-order half of the interrupt vector.
5. Delay for one free bus cycle.
6. Fetch three bytes of program information starting at the address indicated by the interrupt vector to
fill the instruction queue in preparation for execution of the first instruction in the interrupt service
routine.
After the CCR contents are pushed onto the stack, the I bit in the CCR is set to prevent other interrupts
while in the interrupt service routine. Although it is possible to clear the I bit with an instruction in the
interrupt service routine, this would allow nesting of interrupts which is not recommended because it leads
to programs that are difficult to debug and maintain.
For compatibility with the earlier M68HC05 MCUs, the high-order half of the H:X index register pair (H)
is not saved on the stack as part of the interrupt sequence. It is recommended that the user should use a
PSHH instruction at the beginning of the service routine to save H and then use a PULH instruction just
before the RTI that ends the interrupt service routine. It is not necessary to save H if you are certain that
the interrupt service routine does not use any instructions or auto-increment addressing modes which
might change the value of H.
The software interrupt (SWI) instruction is like a hardware interrupt except that it is not masked by the
global I bit in the CCR and it is associated with an instruction opcode within the program so it is not
asynchronous to program execution.
7.5.3 Wait Mode Operation
The WAIT instruction enables interrupts by clearing the I bit in the CCR. It then halts the clocks to the
CPU to reduce overall power consumption while the CPU is waiting for the interrupt or reset event that
will wake the CPU from wait mode. When an interrupt or reset event occurs, the CPU clocks will resume
and the interrupt or reset event will be processed normally.
If a serial BACKGROUND command is issued to the MCU through the background debug interface while
the CPU is in wait mode, CPU clocks will resume and the CPU will enter active background mode where
other serial background commands can be processed. This ensures that a host development system can still
gain access to a target MCU even if it is in wait mode.
7.5.4 Stop Mode Operation
Usually, all system clocks, including the crystal oscillator (when used), are halted during stop mode to
minimize power consumption. In such systems, external circuitry is needed to control the time spent in
stop mode and to issue a signal to wake up the target MCU when it is time to resume processing. Unlike
the earlier M68HC05 and M68HC08 MCUs, the HCS08 can be configured to keep a minimum set of
Central Processor Unit (CPU)
MC9S08GB/GT118 MOTOROLA
clocks running in stop mode. This optionally allows an internal periodic signal to wake the target MCU
from stop mode.
When a host debug system is connected to the background debug pin (BKGD) and the ENBDM control
bit has been set by a serial command through the background interface (or because the MCU was reset into
active background mode), the oscillator is forced to remain active when the MCU enters stop mode. In this
case, if a serial BACKGROUND command is issued to the MCU through the background debug interface
while the CPU is in stop mode, CPU clocks will resume and the CPU will enter active background mode
where other serial background commands can be processed. This ensures that a host development system
can still gain access to a target MCU even if it is in stop mode.
Recovery from stop mode depends on the particular HCS08 and whether the oscillator was stopped in stop
mode. Refer to the Modes chart in Section 3 for more details.
7.5.5 BGND Instruction
The BGND instruction is new to the HCS08 compared to the M68HC08. BGND would not be used in
normal user programs because it forces the CPU to stop processing user instructions and enter the active
background mode. The only way to resume execution of the user program is through reset or by a host
debug system issuing a GO, TRACE1, or TAGGO serial command through the background debug
interface.
Software-based breakpoints can be set by replacing an opcode at the desired breakpoint address with the
BGND opcode. When the program reaches this breakpoint address, the CPU is forced to active
background mode rather than continuing the user program.
7.6 HCS08 Instruction Set Summary
Instruction Set Summary Nomenclature
The nomenclature listed here is used in the instruction descriptions in Table 7-1.
Operators
( ) = Contents of register or memory location shown inside parentheses
←= Is loaded with (read: “gets”)
& = Boolean AND
| = Boolean OR
⊕= Boolean exclusive-OR
×= Multiply
÷= Divide
: = Concatenate
+ = Add
– = Negate (two’s complement)
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 119MC9S08GB/GT
CPU registers
A = Accumulator
CCR = Condition code register
H = Index register, higher order (most significant) 8 bits
X = Index register, lower order (least significant) 8 bits
PC = Program counter
PCH = Program counter, higher order (most significant) 8 bits
PCL = Program counter, lower order (least significant) 8 bits
SP = Stack pointer
Memory and addressing
M=A memory location or absolute data, depending on addressing mode
M:M + $0001= A 16-bit value in two consecutive memory locations. The higher-order (most
significant) 8 bits are located at the address of M, and the lower-order (least
significant) 8 bits are located at the next higher sequential address.
Condition code register (CCR) bits
V = Two’s complement overflow indicator, bit 7
H = Half carry, bit 4
I = Interrupt mask, bit 3
N = Negative indicator, bit 2
Z = Zero indicator, bit 1
C = Carry/borrow, bit 0 (carry out of bit 7)
CCR activity notation
– = Bit not affected
0 = Bit forced to 0
1 = Bit forced to 1
= Bit set or cleared according to results of operation
U = Undefined after the operation
Machine coding notation
dd = Low-order 8 bits of a direct address $0000–$00FF (high byte assumed to be
$00)
ee = Upper 8 bits of 16-bit offset
ff = Lower 8 bits of 16-bit offset or 8-bit offset
ii = One byte of immediate data
jj = High-order byte of a 16-bit immediate data value
kk = Low-order byte of a 16-bit immediate data value
hh = High-order byte of 16-bit extended address
ll = Low-order byte of 16-bit extended address
rr = Relative offset
Central Processor Unit (CPU)
MC9S08GB/GT120 MOTOROLA
Source form
Everything in the source forms columns, except expressions in italic characters, is literal information
which must appear in the assembly source file exactly as shown. The initial 3- to 5-letter mnemonic is
always a literal expression. All commas, pound signs (#), parentheses, and plus signs (+) are literal
characters.
n— Any label or expression that evaluates to a single integer in the range 0–7
opr8i — Any label or expression that evaluates to an 8-bit immediate value
opr16i — Any label or expression that evaluates to a 16-bit immediate value
opr8a — Any label or expression that evaluates to an 8-bit value. The instruction treats
this 8-bit value as the low order 8 bits of an address in the direct page of the
64-Kbyte address space ($00xx).
opr16a — Any label or expression that evaluates to a 16-bit value. The instruction treats
this value as an address in the 64-Kbyte address space.
oprx8 — Any label or expression that evaluates to an unsigned 8-bit value, used for
indexed addressing
oprx16 — Any label or expression that evaluates to a 16-bit value. Since the HCS08 has
a 16-bit address bus, this can be either a signed or an unsigned value.
rel — Any label or expression that refers to an address that is within –128 to +127
locations from the next address after the last byte of object code for the current
instruction. The assembler will calculate the 8-bit signed offset and include it in
the object code for this instruction.
Address modes
INH = Inherent (no operands)
IMM = 8-bit or 16-bit immediate
DIR = 8-bit direct
EXT = 16-bit extended
IX = 16-bit indexed no offset
IX+ = 16-bit indexed no offset, post increment (CBEQ and MOV only)
IX1 = 16-bit indexed with 8-bit offset from H:X
IX1+ = 16-bit indexed with 8-bit offset, post increment
(CBEQ only)
IX2 = 16-bit indexed with 16-bit offset from H:X
REL = 8-bit relative offset
SP1 = Stack pointer with 8-bit offset
SP2 = Stack pointer with 16-bit offset
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 121MC9S08GB/GT
Table 7-1 HCS08 Instruction Set Summary (Sheet 1 of 6)
Source
Form Operation Description
Effect
on CCR
Address
Mode
Opcode
Operand
Bus Cycles(1)
VHI NZC
ADC #opr8i
ADC opr8a
ADC opr16a
ADC oprx16,X
ADC oprx8,X
ADC ,X
ADC oprx16,SP
ADC oprx8,SP
Add with Carry A ← (A) + (M) + (C) –
IMM
DIR
EXT
IX2
IX1
IX
SP2
SP1
A9
B9
C9
D9
E9
F9
9ED9
9EE9
ii
dd
hh ll
ee ff
ff
ee ff
ff
2
3
4
4
3
3
5
4
ADD #opr8i
ADD opr8a
ADD opr16a
ADD oprx16,X
ADD oprx8,X
ADD ,X
ADD oprx16,SP
ADD oprx8,SP
Add without Carry A ← (A) + (M) –
IMM
DIR
EXT
IX2
IX1
IX
SP2
SP1
AB
BB
CB
DB
EB
FB
9EDB
9EEB
ii
dd
hh ll
ee ff
ff
ee ff
ff
2
3
4
4
3
3
5
4
AIS #opr8i Add Immediate Value
(Signed) to Stack Pointer SP ← (SP) + (M)
M is sign extended to a 16-bit value – – – – – – IMM A7 ii 2
AIX #opr8i Add Immediate Value
(Signed) to Index
Register (H:X) H:X ← (H:X) + (M)
M is sign extended to a 16-bit value – – – – – – IMM AF ii 2
AND #opr8i
AND opr8a
AND opr16a
AND oprx16,X
AND oprx8,X
AND ,X
AND oprx16,SP
AND oprx8,SP
Logical AND A ← (A) & (M) 0 – – –
IMM
DIR
EXT
IX2
IX1
IX
SP2
SP1
A4
B4
C4
D4
E4
F4
9ED4
9EE4
ii
dd
hh ll
ee ff
ff
ee ff
ff
2
3
4
4
3
3
5
4
ASL opr8a
ASLA
ASLX
ASL oprx8,X
ASL ,X
ASL oprx8,SP
Arithmetic Shift Left
(Same as LSL) ––
DIR
INH
INH
IX1
IX
SP1
38
48
58
68
78
9E68
dd
ff
ff
5
1
1
5
4
6
ASR opr8a
ASRA
ASRX
ASR oprx8,X
ASR ,X
ASR oprx8,SP
Arithmetic Shift Right – –
DIR
INH
INH
IX1
IX
SP1
37
47
57
67
77
9E67
dd
ff
ff
5
1
1
5
4
6
BCC rel Branch if Carry Bit Clear Branch if (C) = 0 – – – – – – REL 24 rr 3
BCLR n,opr8a Clear Bit n in Memory Mn ← 0 ––––––
DIR (b0)
DIR (b1)
DIR (b2)
DIR (b3)
DIR (b4)
DIR (b5)
DIR (b6)
DIR (b7)
11
13
15
17
19
1B
1D
1F
dd
dd
dd
dd
dd
dd
dd
dd
5
5
5
5
5
5
5
5
BCS rel Branch if Carry Bit Set
(Same as BLO) Branch if (C) = 1 – – – – – – REL 25 rr 3
BEQ rel Branch if Equal Branch if (Z) = 1 – – – – – – REL 27 rr 3
BGE rel Branch if Greater Than or
Equal To
(Signed Operands) Branch if (N ⊕ V) = 0 – – – – – – REL 90 rr 3
BGND Enter Active Background
if ENBDM = 1 Waits For and Processes BDM
Commands Until GO, TRACE1, or
TAGGO – – – – – – INH 82 5+
BGT rel Branch if Greater Than
(Signed Operands) Branch if (Z) | (N ⊕ V) = 0 – – – – – – REL 92 rr 3
BHCC rel Branch if Half Carry Bit
Clear Branch if (H) = 0 – – – – – – REL 28 rr 3
Cb0
b7 0
b0
b7 C
Central Processor Unit (CPU)
MC9S08GB/GT122 MOTOROLA
BHCS rel Branch if Half Carry Bit
Set Branch if (H) = 1 – – – – – – REL 29 rr 3
BHI rel Branch if Higher Branch if (C) | (Z) = 0 – – – – – – REL 22 rr 3
BHS rel Branch if Higher or Same
(Same as BCC) Branch if (C) = 0 – – – – – – REL 24 rr 3
BIH rel Branch if IRQ Pin High Branch if IRQ pin = 1 – – – – – – REL 2F rr 3
BIL rel Branch if IRQ Pin Low Branch if IRQ pin = 0 – – – – – – REL 2E rr 3
BIT #opr8i
BIT opr8a
BIT opr16a
BIT oprx16,X
BIT oprx8,X
BIT ,X
BIT oprx16,SP
BIT oprx8,SP
Bit Test (A) & (M)
(CCR Updated but Operands
Not Changed) 0–– –
IMM
DIR
EXT
IX2
IX1
IX
SP2
SP1
A5
B5
C5
D5
E5
F5
9ED5
9EE5
ii
dd
hh ll
ee ff
ff
ee ff
ff
2
3
4
4
3
3
5
4
BLE rel Branch if Less Than
or Equal To
(Signed Operands) Branch if (Z) | (N ⊕V) = 1 – – – – – – REL 93 rr 3
BLO rel Branch if Lower
(Same as BCS) Branch if (C) = 1 – – – – – – REL 25 rr 3
BLS rel Branch if Lower or Same Branch if (C) | (Z) = 1 – – – – – – REL 23 rr 3
BLT rel Branch if Less Than
(Signed Operands) Branch if (N ⊕ V ) = 1 – – – – – – REL 91 rr 3
BMC rel Branch if Interrupt Mask
Clear Branch if (I) = 0 – – – – – – REL 2C rr 3
BMI rel Branch if Minus Branch if (N) = 1 – – – – – – REL 2B rr 3
BMS rel Branch if Interrupt Mask
Set Branch if (I) = 1 – – – – – – REL 2D rr 3
BNE rel Branch if Not Equal Branch if (Z) = 0 – – – – – – REL 26 rr 3
BPL rel Branch if Plus Branch if (N) = 0 – – – – – – REL 2A rr 3
BRA rel Branch Always No Test – – – – – – REL 20 rr 3
BRCLR n,opr8a,rel Branch if Bit nin Memory
Clear Branch if (Mn) = 0 – – – – –
DIR (b0)
DIR (b1)
DIR (b2)
DIR (b3)
DIR (b4)
DIR (b5)
DIR (b6)
DIR (b7)
01
03
05
07
09
0B
0D
0F
dd rr
dd rr
dd rr
dd rr
dd rr
dd rr
dd rr
dd rr
5
5
5
5
5
5
5
5
BRN rel Branch Never Uses 3 Bus Cycles – – – – – – REL 21 rr 3
BRSET n,opr8a,rel Branch if Bit nin Memory
Set Branch if (Mn) = 1 – – – – –
DIR (b0)
DIR (b1)
DIR (b2)
DIR (b3)
DIR (b4)
DIR (b5)
DIR (b6)
DIR (b7)
00
02
04
06
08
0A
0C
0E
dd rr
dd rr
dd rr
dd rr
dd rr
dd rr
dd rr
dd rr
5
5
5
5
5
5
5
5
BSET n,opr8a Set Bit nin Memory Mn ← 1 ––––––
DIR (b0)
DIR (b1)
DIR (b2)
DIR (b3)
DIR (b4)
DIR (b5)
DIR (b6)
DIR (b7)
10
12
14
16
18
1A
1C
1E
dd
dd
dd
dd
dd
dd
dd
dd
5
5
5
5
5
5
5
5
BSR rel Branch to Subroutine PC ←(PC) + $0002
push (PCL); SP ← (SP) – $0001
push (PCH); SP ← (SP) – $0001
PC ← (PC) + rel – – – – – – REL AD rr 5
Table 7-1 HCS08 Instruction Set Summary (Sheet 2 of 6)
Source
Form Operation Description
Effect
on CCR
Address
Mode
Opcode
Operand
Bus Cycles(1)
VHI NZC
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 123MC9S08GB/GT
CBEQ opr8a,rel
CBEQA #opr8i,rel
CBEQX #opr8i,rel
CBEQ oprx8,X+,rel
CBEQ ,X+,rel
CBEQ oprx8,SP,rel
Compare and Branch if
Equal
Branch if (A) = (M)
Branch if (A) = (M)
Branch if (X) = (M)
Branch if (A) = (M)
Branch if (A) = (M)
Branch if (A) = (M)
––––––
DIR
IMM
IMM
IX1+
IX+
SP1
31
41
51
61
71
9E61
dd rr
ii rr
ii rr
ff rr
rr
ff rr
5
4
4
5
5
6
CLC Clear Carry Bit C ← 0 – – – – – 0 INH 98 1
CLI Clear Interrupt Mask Bit I ← 0 – – 0 – – – INH 9A 1
CLR opr8a
CLRA
CLRX
CLRH
CLR oprx8,X
CLR ,X
CLR oprx8,SP
Clear
M← $00
A← $00
X← $00
H← $00
M← $00
M← $00
M← $00
0––01–
DIR
INH
INH
INH
IX1
IX
SP1
3F
4F
5F
8C
6F
7F
9E6F
dd
ff
ff
5
1
1
1
5
4
6
CMP #opr8i
CMP opr8a
CMP opr16a
CMP oprx16,X
CMP oprx8,X
CMP ,X
CMP oprx16,SP
CMP oprx8,SP
Compare Accumulator
with Memory (A) – (M)
(CCR Updated But Operands Not
Changed) ––
IMM
DIR
EXT
IX2
IX1
IX
SP2
SP1
A1
B1
C1
D1
E1
F1
9ED1
9EE1
ii
dd
hh ll
ee ff
ff
ee ff
ff
2
3
4
4
3
3
5
4
COM opr8a
COMA
COMX
COM oprx8,X
COM ,X
COM oprx8,SP
Complement
(One’s Complement)
M← (M)= $FF – (M)
A← (A) = $FF – (A)
X← (X) = $FF – (X)
M← (M) = $FF – (M)
M← (M) = $FF – (M)
M← (M) = $FF – (M)
0–– 1
DIR
INH
INH
IX1
IX
SP1
33
43
53
63
73
9E63
dd
ff
ff
5
1
1
5
4
6
CPHX opr16a
CPHX #opr16i
CPHX opr8a
CPHX oprx8,SP
Compare Index Register
(H:X) with Memory (H:X) – (M:M + $0001)
(CCR Updated But Operands Not
Changed) –– EXT
IMM
DIR
SP1
3E
65
75
9EF3
hh ll
jj kk
dd
ff
6
3
5
6
CPX #opr8i
CPX opr8a
CPX opr16a
CPX oprx16,X
CPX oprx8,X
CPX ,X
CPX oprx16,SP
CPX oprx8,SP
Compare X (Index
Register Low) with
Memory
(X) – (M)
(CCR Updated But Operands Not
Changed) ––
IMM
DIR
EXT
IX2
IX1
IX
SP2
SP1
A3
B3
C3
D3
E3
F3
9ED3
9EE3
ii
dd
hh ll
ee ff
ff
ee ff
ff
2
3
4
4
3
3
5
4
DAA Decimal Adjust
AccumulatorAfterADDor
ADC of BCD Values (A)10 U – – INH 72 1
DBNZ opr8a,rel
DBNZA rel
DBNZX rel
DBNZ oprx8,X,rel
DBNZ ,X,rel
DBNZ oprx8,SP,rel
Decrement and Branch if
Not Zero Decrement A, X, or M
Branch if (result) ≠0
DBNZX Affects X Not H ––––––
DIR
INH
INH
IX1
IX
SP1
3B
4B
5B
6B
7B
9E6B
dd rr
rr
rr
ff rr
rr
ff rr
7
4
4
7
6
8
DEC opr8a
DECA
DECX
DEC oprx8,X
DEC ,X
DEC oprx8,SP
Decrement
M← (M) – $01
A← (A) – $01
X← (X) – $01
M← (M) – $01
M← (M) – $01
M← (M) – $01
–– –
DIR
INH
INH
IX1
IX
SP1
3A
4A
5A
6A
7A
9E6A
dd
ff
ff
5
1
1
5
4
6
DIV Divide A← (H:A)÷(X)
H← Remainder – – – – INH 52 6
Table 7-1 HCS08 Instruction Set Summary (Sheet 3 of 6)
Source
Form Operation Description
Effect
on CCR
Address
Mode
Opcode
Operand
Bus Cycles(1)
VHI NZC
Central Processor Unit (CPU)
MC9S08GB/GT124 MOTOROLA
EOR #opr8i
EOR opr8a
EOR opr16a
EOR oprx16,X
EOR oprx8,X
EOR ,X
EOR oprx16,SP
EOR oprx8,SP
Exclusive OR
Memory with
Accumulator A← (A ⊕ M) 0 – – –
IMM
DIR
EXT
IX2
IX1
IX
SP2
SP1
A8
B8
C8
D8
E8
F8
9ED8
9EE8
ii
dd
hh ll
ee ff
ff
ee ff
ff
2
3
4
4
3
3
5
4
INC opr8a
INCA
INCX
INC oprx8,X
INC ,X
INC oprx8,SP
Increment
M← (M) + $01
A← (A) + $01
X← (X) + $01
M← (M) + $01
M← (M) + $01
M← (M) + $01
–– –
DIR
INH
INH
IX1
IX
SP1
3C
4C
5C
6C
7C
9E6C
dd
ff
ff
5
1
1
5
4
6
JMP opr8a
JMP opr16a
JMP oprx16,X
JMP oprx8,X
JMP ,X
Jump PC ← Jump Address – – – – – –
DIR
EXT
IX2
IX1
IX
BC
CC
DC
EC
FC
dd
hh ll
ee ff
ff
3
4
4
3
3
JSR opr8a
JSR opr16a
JSR oprx16,X
JSR oprx8,X
JSR ,X
Jump to Subroutine PC ← (PC) + n (n = 1, 2, or 3)
Push (PCL); SP ← (SP) – $0001
Push (PCH); SP ← (SP) – $0001
PC ← Unconditional Address ––––––
DIR
EXT
IX2
IX1
IX
BD
CD
DD
ED
FD
dd
hh ll
ee ff
ff
5
6
6
5
5
LDA #opr8i
LDA opr8a
LDA opr16a
LDA oprx16,X
LDA oprx8,X
LDA ,X
LDA oprx16,SP
LDA oprx8,SP
Load Accumulator from
Memory A← (M) 0 – – –
IMM
DIR
EXT
IX2
IX1
IX
SP2
SP1
A6
B6
C6
D6
E6
F6
9ED6
9EE6
ii
dd
hh ll
ee ff
ff
ee ff
ff
2
3
4
4
3
3
5
4
LDHX #opr16i
LDHX opr8a
LDHX opr16a
LDHX ,X
LDHX oprx16,X
LDHX oprx8,X
LDHX oprx8,SP
LoadIndexRegister(H:X)
from Memory H:X ← (M:M + $0001)0–– –
IMM
DIR
EXT
IX
IX2
IX1
SP1
45
55
32
9EAE
9EBE
9ECE
9EFE
jj kk
dd
hh ll
ee ff
ff
ff
3
4
5
5
6
5
5
LDX #opr8i
LDX opr8a
LDX opr16a
LDX oprx16,X
LDX oprx8,X
LDX ,X
LDX oprx16,SP
LDX oprx8,SP
Load X (Index Register
Low) from Memory X← (M) 0 –– –
IMM
DIR
EXT
IX2
IX1
IX
SP2
SP1
AE
BE
CE
DE
EE
FE
9EDE
9EEE
ii
dd
hh ll
ee ff
ff
ee ff
ff
2
3
4
4
3
3
5
4
LSL opr8a
LSLA
LSLX
LSL oprx8,X
LSL ,X
LSL oprx8,SP
Logical Shift Left
(Same as ASL) ––
DIR
INH
INH
IX1
IX
SP1
38
48
58
68
78
9E68
dd
ff
ff
5
1
1
5
4
6
LSR opr8a
LSRA
LSRX
LSR oprx8,X
LSR ,X
LSR oprx8,SP
Logical Shift Right ––0
DIR
INH
INH
IX1
IX
SP1
34
44
54
64
74
9E64
dd
ff
ff
5
1
1
5
4
6
MOV opr8a,opr8a
MOV opr8a,X+
MOV #opr8i,opr8a
MOV ,X+,opr8a Move (M)destination ←(M)source
H:X ← (H:X) + $0001 in
IX+/DIR and DIR/IX+ Modes 0–– –
DIR/DIR
DIR/IX+
IMM/DIR
IX+/DIR
4E
5E
6E
7E
dd dd
dd
ii dd
dd
5
5
4
5
MUL Unsigned multiply X:A ← (X) × (A) –0–––0 INH 42 5
Table 7-1 HCS08 Instruction Set Summary (Sheet 4 of 6)
Source
Form Operation Description
Effect
on CCR
Address
Mode
Opcode
Operand
Bus Cycles(1)
VHI NZC
Cb0
b7 0
b0
b7 C0
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 125MC9S08GB/GT
NEG opr8a
NEGA
NEGX
NEG oprx8,X
NEG ,X
NEG oprx8,SP
Negate
(Two’s Complement)
M← – (M) = $00 – (M)
A← – (A) = $00 – (A)
X← – (X) = $00 – (X)
M← – (M) = $00 – (M)
M← – (M) = $00 – (M)
M← – (M) = $00 – (M)
––
DIR
INH
INH
IX1
IX
SP1
30
40
50
60
70
9E60
dd
ff
ff
5
1
1
5
4
6
NOP No Operation Uses 1 Bus Cycle ––––––INH 9D 1
NSA Nibble Swap
Accumulator A← (A[3:0]:A[7:4]) ––––––INH 62 1
ORA #opr8i
ORA opr8a
ORA opr16a
ORA oprx16,X
ORA oprx8,X
ORA ,X
ORA oprx16,SP
ORA oprx8,SP
InclusiveORAccumulator
and Memory A← (A) | (M) 0 –– –
IMM
DIR
EXT
IX2
IX1
IX
SP2
SP1
AA
BA
CA
DA
EA
FA
9EDA
9EEA
ii
dd
hh ll
ee ff
ff
ee ff
ff
2
3
4
4
3
3
5
4
PSHA Push Accumulator onto
Stack Push (A); SP ←(SP) – $0001 ––––––INH 87 2
PSHH Push H (Index Register
High) onto Stack Push (H); SP ←(SP) – $0001 ––––––INH 8B 2
PSHX Push X (Index Register
Low) onto Stack Push (X);SP ←(SP) – $0001 ––––––INH 89 2
PULA Pull Accumulator from
Stack SP ←(SP + $0001); Pull (A)––––––INH 86 3
PULH Pull H (Index Register
High) from Stack SP ←(SP + $0001); Pull (H)––––––INH 8A 3
PULX Pull X (Index Register
Low) from Stack SP ←(SP + $0001); Pull (X)––––––INH 88 3
ROL opr8a
ROLA
ROLX
ROL oprx8,X
ROL ,X
ROL oprx8,SP
Rotate Left through Carry ––
DIR
INH
INH
IX1
IX
SP1
39
49
59
69
79
9E69
dd
ff
ff
5
1
1
5
4
6
ROR opr8a
RORA
RORX
ROR oprx8,X
ROR ,X
ROR oprx8,SP
Rotate Right through
Carry ––
DIR
INH
INH
IX1
IX
SP1
36
46
56
66
76
9E66
dd
ff
ff
5
1
1
5
4
6
RSP Reset Stack Pointer SP ← $FF
(High Byte Not Affected) ––––––INH 9C 1
RTI Return from Interrupt
SP ← (SP) + $0001; Pull (CCR)
SP ← (SP) + $0001; Pull (A)
SP ← (SP) + $0001; Pull (X)
SP ← (SP) + $0001; Pull (PCH)
SP ← (SP) + $0001; Pull (PCL)
INH 80 9
RTS Return from Subroutine SP ← SP + $0001;Pull (PCH)
SP ← SP + $0001; Pull (PCL) ––––––INH 81 6
SBC #opr8i
SBC opr8a
SBC opr16a
SBC oprx16,X
SBC oprx8,X
SBC ,X
SBC oprx16,SP
SBC oprx8,SP
Subtract with Carry A ← (A) – (M) – (C) ––
IMM
DIR
EXT
IX2
IX1
IX
SP2
SP1
A2
B2
C2
D2
E2
F2
9ED2
9EE2
ii
dd
hh ll
ee ff
ff
ee ff
ff
2
3
4
4
3
3
5
4
SEC Set Carry Bit C ← 1 –––––1 INH 99 1
SEI Set Interrupt Mask Bit I ← 1 ––1–––INH 9B 1
Table 7-1 HCS08 Instruction Set Summary (Sheet 5 of 6)
Source
Form Operation Description
Effect
on CCR
Address
Mode
Opcode
Operand
Bus Cycles(1)
VHI NZC
Cb0
b7
b0
b7 C
Central Processor Unit (CPU)
MC9S08GB/GT126 MOTOROLA
STA opr8a
STA opr16a
STA oprx16,X
STA oprx8,X
STA ,X
STA oprx16,SP
STA oprx8,SP
Store Accumulator in
Memory M←(A) 0 –– –
DIR
EXT
IX2
IX1
IX
SP2
SP1
B7
C7
D7
E7
F7
9ED7
9EE7
dd
hh ll
ee ff
ff
ee ff
ff
3
4
4
3
2
5
4
STHX opr8a
STHX opr16a
STHX oprx8,SP Store H:X (Index Reg.) (M:M + $0001) ← (H:X) 0 –– –
DIR
EXT
SP1
35
96
9EFF
dd
hh ll
ff
4
5
5
STOP Enable Interrupts:
Stop Processing
Refer to MCU
Documentation I bit ← 0; Stop Processing ––0–––INH 8E 2+
STX opr8a
STX opr16a
STX oprx16,X
STX oprx8,X
STX ,X
STX oprx16,SP
STX oprx8,SP
Store X (Low 8 Bits of
Index Register)
in Memory M←(X) 0 –– –
DIR
EXT
IX2
IX1
IX
SP2
SP1
BF
CF
DF
EF
FF
9EDF
9EEF
dd
hh ll
ee ff
ff
ee ff
ff
3
4
4
3
2
5
4
SUB #opr8i
SUB opr8a
SUB opr16a
SUB oprx16,X
SUB oprx8,X
SUB ,X
SUB oprx16,SP
SUB oprx8,SP
Subtract A ← (A) – (M) ––
IMM
DIR
EXT
IX2
IX1
IX
SP2
SP1
A0
B0
C0
D0
E0
F0
9ED0
9EE0
ii
dd
hh ll
ee ff
ff
ee ff
ff
2
3
4
4
3
3
5
4
SWI Software Interrupt
PC ← (PC) + $0001
Push (PCL); SP ← (SP) – $0001
Push (PCH); SP ← (SP) – $0001
Push (X); SP ← (SP) – $0001
Push (A); SP ← (SP) – $0001
Push (CCR); SP ← (SP) – $0001
I← 1;
PCH ← Interrupt Vector High Byte
PCL ← Interrupt Vector Low Byte
––1–––INH 83 11
TAP Transfer Accumulator to
CCR CCR ← (A) INH 84 1
TAX Transfer Accumulator to
X (Index Register Low) X← (A) ––––––INH 97 1
TPA Transfer CCR to
Accumulator A← (CCR) ––––––INH 85 1
TST opr8a
TSTA
TSTX
TST oprx8,X
TST ,X
TST oprx8,SP
Test for Negative or Zero
(M) – $00
(A) – $00
(X) – $00
(M) – $00
(M) – $00
(M) – $00
0–– –
DIR
INH
INH
IX1
IX
SP1
3D
4D
5D
6D
7D
9E6D
dd
ff
ff
4
1
1
4
3
5
TSX Transfer SP to Index Reg. H:X ← (SP) + $0001 ––––––INH 95 2
TXA Transfer X (Index Reg.
Low) to Accumulator A← (X) ––––––INH 9F 1
TXS Transfer Index Reg. to SP SP ← (H:X) – $0001 ––––––INH 94 2
WAIT Enable Interrupts; Wait
for Interrupt I bit ← 0; Halt CPU ––0–––INH 8F 2+
NOTES:
1. Bus clock frequency is one-half of the CPU clock frequency.
Table 7-1 HCS08 Instruction Set Summary (Sheet 6 of 6)
Source
Form Operation Description
Effect
on CCR
Address
Mode
Opcode
Operand
Bus Cycles(1)
VHI NZC
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 127MC9S08GB/GT
Table 7-2 Opcode Map (Sheet 1 of 2)
Bit-Manipulation Branch Read-Modify-Write Control Register/Memory
00 5
BRSET0
3 DIR
10 5
BSET0
2 DIR
20 3
BRA
2 REL
30 5
NEG
2 DIR
40 1
NEGA
1 INH
50 1
NEGX
1 INH
60 5
NEG
2 IX1
70 4
NEG
1IX
80 9
RTI
1 INH
90 3
BGE
2 REL
A0 2
SUB
2 IMM
B0 3
SUB
2 DIR
C0 4
SUB
3 EXT
D0 4
SUB
3 IX2
E0 3
SUB
2 IX1
F0 3
SUB
1IX
01 5
BRCLR0
3 DIR
11 5
BCLR0
2 DIR
21 3
BRN
2 REL
31 5
CBEQ
3 DIR
41 4
CBEQA
3 IMM
51 4
CBEQX
3 IMM
61 5
CBEQ
3 IX1+
71 5
CBEQ
2 IX+
81 6
RTS
1 INH
91 3
BLT
2 REL
A1 2
CMP
2 IMM
B1 3
CMP
2 DIR
C1 4
CMP
3 EXT
D1 4
CMP
3 IX2
E1 3
CMP
2 IX1
F1 3
CMP
1IX
02 5
BRSET1
3 DIR
12 5
BSET1
2 DIR
22 3
BHI
2 REL
32 5
LDHX
3 EXT
42 5
MUL
1 INH
52 6
DIV
1 INH
62 1
NSA
1 INH
72 1
DAA
1 INH
82 5+
BGND
1 INH
92 3
BGT
2 REL
A2 2
SBC
2 IMM
B2 3
SBC
2 DIR
C2 4
SBC
3 EXT
D2 4
SBC
3 IX2
E2 3
SBC
2 IX1
F2 3
SBC
1IX
03 5
BRCLR1
3 DIR
13 5
BCLR1
2 DIR
23 3
BLS
2 REL
33 5
COM
2 DIR
43 1
COMA
1 INH
53 1
COMX
1 INH
63 5
COM
2 IX1
73 4
COM
1IX
83 11
SWI
1 INH
93 3
BLE
2 REL
A3 2
CPX
2 IMM
B3 3
CPX
2 DIR
C3 4
CPX
3 EXT
D3 4
CPX
3 IX2
E3 3
CPX
2 IX1
F3 3
CPX
1IX
04 5
BRSET2
3 DIR
14 5
BSET2
2 DIR
24 3
BCC
2 REL
34 5
LSR
2 DIR
44 1
LSRA
1 INH
54 1
LSRX
1 INH
64 5
LSR
2 IX1
74 4
LSR
1IX
84 1
TAP
1 INH
94 2
TXS
1 INH
A4 2
AND
2 IMM
B4 3
AND
2 DIR
C4 4
AND
3 EXT
D4 4
AND
3 IX2
E4 3
AND
2 IX1
F4 3
AND
1IX
05 5
BRCLR2
3 DIR
15 5
BCLR2
2 DIR
25 3
BCS
2 REL
35 4
STHX
2 DIR
45 3
LDHX
3 IMM
55 4
LDHX
2 DIR
65 3
CPHX
3 IMM
75 5
CPHX
2 DIR
85 1
TPA
1 INH
95 2
TSX
1 INH
A5 2
BIT
2 IMM
B5 3
BIT
2 DIR
C5 4
BIT
3 EXT
D5 4
BIT
3 IX2
E5 3
BIT
2 IX1
F5 3
BIT
1IX
06 5
BRSET3
3 DIR
16 5
BSET3
2 DIR
26 3
BNE
2 REL
36 5
ROR
2 DIR
46 1
RORA
1 INH
56 1
RORX
1 INH
66 5
ROR
2 IX1
76 4
ROR
1IX
86 3
PULA
1 INH
96 5
STHX
3 EXT
A6 2
LDA
2 IMM
B6 3
LDA
2 DIR
C6 4
LDA
3 EXT
D6 4
LDA
3 IX2
E6 3
LDA
2 IX1
F6 3
LDA
1IX
07 5
BRCLR3
3 DIR
17 5
BCLR3
2 DIR
27 3
BEQ
2 REL
37 5
ASR
2 DIR
47 1
ASRA
1 INH
57 1
ASRX
1 INH
67 5
ASR
2 IX1
77 4
ASR
1IX
87 2
PSHA
1 INH
97 1
TAX
1 INH
A7 2
AIS
2 IMM
B7 3
STA
2 DIR
C7 4
STA
3 EXT
D7 4
STA
3 IX2
E7 3
STA
2 IX1
F7 2
STA
1IX
08 5
BRSET4
3 DIR
18 5
BSET4
2 DIR
28 3
BHCC
2 REL
38 5
LSL
2 DIR
48 1
LSLA
1 INH
58 1
LSLX
1 INH
68 5
LSL
2 IX1
78 4
LSL
1IX
88 3
PULX
1 INH
98 1
CLC
1 INH
A8 2
EOR
2 IMM
B8 3
EOR
2 DIR
C8 4
EOR
3 EXT
D8 4
EOR
3 IX2
E8 3
EOR
2 IX1
F8 3
EOR
1IX
09 5
BRCLR4
3 DIR
19 5
BCLR4
2 DIR
29 3
BHCS
2 REL
39 5
ROL
2 DIR
49 1
ROLA
1 INH
59 1
ROLX
1 INH
69 5
ROL
2 IX1
79 4
ROL
1IX
89 2
PSHX
1 INH
99 1
SEC
1 INH
A9 2
ADC
2 IMM
B9 3
ADC
2 DIR
C9 4
ADC
3 EXT
D9 4
ADC
3 IX2
E9 3
ADC
2 IX1
F9 3
ADC
1IX
0A 5
BRSET5
3 DIR
1A 5
BSET5
2 DIR
2A 3
BPL
2 REL
3A 5
DEC
2 DIR
4A 1
DECA
1 INH
5A 1
DECX
1 INH
6A 5
DEC
2 IX1
7A 4
DEC
1IX
8A 3
PULH
1 INH
9A 1
CLI
1 INH
AA 2
ORA
2 IMM
BA 3
ORA
2 DIR
CA 4
ORA
3 EXT
DA 4
ORA
3 IX2
EA 3
ORA
2 IX1
FA 3
ORA
1IX
0B 5
BRCLR5
3 DIR
1B 5
BCLR5
2 DIR
2B 3
BMI
2 REL
3B 7
DBNZ
3 DIR
4B 4
DBNZA
2 INH
5B 4
DBNZX
2 INH
6B 7
DBNZ
3 IX1
7B 6
DBNZ
2IX
8B 2
PSHH
1 INH
9B 1
SEI
1 INH
AB 2
ADD
2 IMM
BB 3
ADD
2 DIR
CB 4
ADD
3 EXT
DB 4
ADD
3 IX2
EB 3
ADD
2 IX1
FB 3
ADD
1IX
0C 5
BRSET6
3 DIR
1C 5
BSET6
2 DIR
2C 3
BMC
2 REL
3C 5
INC
2 DIR
4C 1
INCA
1 INH
5C 1
INCX
1 INH
6C 5
INC
2 IX1
7C 4
INC
1IX
8C 1
CLRH
1 INH
9C 1
RSP
1 INH
BC 3
JMP
2 DIR
CC 4
JMP
3 EXT
DC 4
JMP
3 IX2
EC 3
JMP
2 IX1
FC 3
JMP
1IX
0D 5
BRCLR6
3 DIR
1D 5
BCLR6
2 DIR
2D 3
BMS
2 REL
3D 4
TST
2 DIR
4D 1
TSTA
1 INH
5D 1
TSTX
1 INH
6D 4
TST
2 IX1
7D 3
TST
1IX
9D 1
NOP
1 INH
AD 5
BSR
2 REL
BD 5
JSR
2 DIR
CD 6
JSR
3 EXT
DD 6
JSR
3 IX2
ED 5
JSR
2 IX1
FD 5
JSR
1IX
0E 5
BRSET7
3 DIR
1E 5
BSET7
2 DIR
2E 3
BIL
2 REL
3E 6
CPHX
3 EXT
4E 6
MOV
3DD
5E 5
MOV
2 DIX+
6E 4
MOV
3 IMD
7E 5
MOV
2 IX+D
8E 2+
STOP
1 INH
9E
Page 2 AE 2
LDX
2 IMM
BE 3
LDX
2 DIR
CE 4
LDX
3 EXT
DE 4
LDX
3 IX2
EE 3
LDX
2 IX1
FE 3
LDX
1IX
0F 5
BRCLR7
3 DIR
1F 5
BCLR7
2 DIR
2F 3
BIH
2 REL
3F 5
CLR
2 DIR
4F 1
CLRA
1 INH
5F 1
CLRX
1 INH
6F 5
CLR
2 IX1
7F 4
CLR
1IX
8F 2+
WAIT
1 INH
9F 1
TXA
1 INH
AF 2
AIX
2 IMM
BF 3
STX
2 DIR
CF 4
STX
3 EXT
DF 4
STX
3 IX2
EF 3
STX
2 IX1
FF 2
STX
1IX
INH Inherent REL Relative SP1 Stack Pointer, 8-Bit Offset
IMM Immediate IX Indexed, No Offset SP2 Stack Pointer, 16-Bit Offset
DIR Direct IX1 Indexed, 8-Bit Offset IX+ Indexed, No Offset with
EXT Extended IX2 Indexed, 16-Bit Offset Post Increment
DD DIR to DIR IMD IMM to DIR IX1+ Indexed, 1-Byte Offset with
IX+D IX+ to DIR DIX+ DIR to IX+ Post Increment Opcode in
Hexadecimal
Number of Bytes
F0 3
SUB
1IX
HCS08 Cycles
Instruction Mnemonic
Addressing Mode
Central Processor Unit (CPU)
MC9S08GB/GT128 MOTOROLA
Bit-Manipulation Branch Read-Modify-Write Control Register/Memory
9E60 6
NEG
3 SP1
9ED0 5
SUB
4 SP2
9EE0 4
SUB
3 SP1
9E61 6
CBEQ
4 SP1
9ED1 5
CMP
4 SP2
9EE1 4
CMP
3 SP1
9ED2 5
SBC
4 SP2
9EE2 4
SBC
3 SP1
9E63 6
COM
3 SP1
9ED3 5
CPX
4 SP2
9EE3 4
CPX
3 SP1
9EF3 6
CPHX
3 SP1
9E64 6
LSR
3 SP1
9ED4 5
AND
4 SP2
9EE4 4
AND
3 SP1
9ED5 5
BIT
4 SP2
9EE5 4
BIT
3 SP1
9E66 6
ROR
3 SP1
9ED6 5
LDA
4 SP2
9EE6 4
LDA
3 SP1
9E67 6
ASR
3 SP1
9ED7 5
STA
4 SP2
9EE7 4
STA
3 SP1
9E68 6
LSL
3 SP1
9ED8 5
EOR
4 SP2
9EE8 4
EOR
3 SP1
9E69 6
ROL
3 SP1
9ED9 5
ADC
4 SP2
9EE9 4
ADC
3 SP1
9E6A 6
DEC
3 SP1
9EDA 5
ORA
4 SP2
9EEA 4
ORA
3 SP1
9E6B 8
DBNZ
4 SP1
9EDB 5
ADD
4 SP2
9EEB 4
ADD
3 SP1
9E6C 6
INC
3 SP1
9E6D 5
TST
3 SP1 9EAE 5
LDHX
2IX
9EBE 6
LDHX
4 IX2
9ECE 5
LDHX
3 IX1
9EDE 5
LDX
4 SP2
9EEE 4
LDX
3 SP1
9EFE 5
LDHX
3 SP1
9E6F 6
CLR
3 SP1
9EDF 5
STX
4 SP2
9EEF 4
STX
3 SP1
9EFF 5
STHX
3 SP1
INH Inherent REL Relative SP1 Stack Pointer, 8-Bit Offset
IMM Immediate IX Indexed, No Offset SP2 Stack Pointer, 16-Bit Offset
DIR Direct IX1 Indexed, 8-Bit Offset IX+ Indexed, No Offset with
EXT Extended IX2 Indexed, 16-Bit Offset Post Increment
DD DIR to DIR IMD IMM to DIR IX1+ Indexed, 1-Byte Offset with
IX+D IX+ to DIR DIX+ DIR to IX+ Post Increment
Note: All Sheet 2 Opcodes are Preceded by the Page 2 Prebyte (9E) Prebyte (9E) and Opcode in
Hexadecimal
Number of Bytes
9E60 6
NEG
3 SP1
HCS08 Cycles
Instruction Mnemonic
Addressing Mode
Table 7-2 Opcode Map (Sheet 2 of 2)
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 129MC9S08GB/GT
Section 8 Parallel Input/Output
8.1 Introduction
This section explains software controls related to parallel input/output (I/O). The MC9S08GBxx has seven
I/O ports which include a total of 56 general-purpose I/O pins (one of these pins is output only). The
MC9S08GTxx has six I/O ports which include a total of up to 36 general-purpose I/O pins (one of these
pins is output only and one is input only). See the Pins and Connections section for more information
about the logic and hardware aspects of these pins.
Many of these pins are shared with on-chip peripherals such as timer systems, external interrupts, or
keyboard interrupts. When these other modules are not controlling the port pins, they revert to
general-purpose I/O control. For each I/O pin, a port data bit provides access to input (read) and output
(write) data, a data direction bit controls the direction of the pin, and a pullup enable bit enables an internal
pullup device (provided the pin is configured as an input), and a slew rate control bit controls the rise and
fall times of the pins.
NOTE: Not all general-purpose I/O pins are available on all packages. To avoid extra
current drain from floating input pins, the user’s reset initialization routine in the
application program should either enable on-chip pullup devices or change the
direction of unconnected pins to outputs so the pins do not float.
Parallel Input/Output
MC9S08GB/GT130 MOTOROLA
Figure 8-1 Block Diagram Highlighting Parallel Input/Output Pins
PTD3/TPM2CH0
PTD4/TPM2CH1
PTD5/TPM2CH2
PTD6/TPM2CH3
PTC1/RxD2
PTC0/TxD2
VSS
VDD
PTE3/MISO
PTE2/SS
PTA7/KBIP7–
PTE0/TxD1
PTE1/RxD1
PTD2/TPM1CH2
PTD1/TPM1CH1
PTD0/TPM1CH0
PTC7
PTC6
PTC5
PTC4
PTC3/SCL
PTC2/SDA
PORT A
PORT C
PORT D
PORT E
8-BIT KEYBOARD
INTERRUPT MODULE (KBI)
IIC MODULE (IIC)
SERIAL PERIPHERAL
INTERFACE MODULE (SPI)
USER FLASH
USER RAM
(GB60 = 4096 BYTES)
DEBUG
MODULE (DBG)
(GB60 = 61,268 BYTES)
HCS08 CORE
CPU
BDC
INT
BKP
NOTES:
1. Port pins are software configurable with pullup device if input port.
2. Pin contains software configurable pullup/pulldown device if IRQ enabled (IRQPE = 1).
3. IRQ does not have a clamp diode to VDD. IRQ should not be driven above VDD.
4. Pin contains integrated pullup device.
5. High current drive
6. Pins PTA[7:4] contain software configurable pullup/pulldown device.
NOTE 1
NOTE 1
3-CHANNEL TIMER/PWM
MODULE (TPM1)
PTB7/AD7–
PORT B
PTE5/SPSCK
PTE4/MOSI
PTE6
PTE7
INTERFACE MODULE (SCI2)
HCS08 SYSTEM CONTROL
RESETS AND INTERRUPTS
MODES OF OPERATION
POWER MANAGEMENT
VOLTAGE
REGULATOR
RTI
SERIAL COMMUNICATIONS
COP
IRQ LVD
INTERNAL BUS
LOW-POWER OSCILLATOR
INTERNAL CLOCK
GENERATOR (ICG)
RESET
VSSAD
VDDAD
VREFH
VREFL
ANALOG-TO-DIGITAL
CONVERTER (ATD)
INTERFACE MODULE (SCI1)
SERIAL COMMUNICATIONS
5-CHANNEL TIMER/PWM
MODULE (TPM2)
PORT F
PTF7–PTF0
NOTE 1
PTD7/TPM2CH4
8
PTA0/KBIP0
8
PTB0/AD0
8
PTG3
PTG2/EXTAL
PTG0/BKGD/MS
PTG1/XTAL
PORT G
PTG4
PTG6
PTG7
PTG5
NOTE 4
NOTES 1, 5
(GB32 = 32,768 BYTES)
(GB32 = 2048 BYTES)
IRQ
NOTES 2, 3
10-BIT
NOTES 1, 6
NOTE 1
NOTES 1, 5
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 131MC9S08GB/GT
8.2 Features
Parallel I/O features, depending on package choice, include:
• A total of 56 general-purpose I/O pins in seven ports (one is output only)
• High-current drivers on port C and port F pins
• Hysteresis input buffers
• Software-controlled pullups on each input pin
• Software-controlled slew rate output buffers
• Eight port A pins shared with KBI
• Eight port B pins shared with ATD
• Eight high-current port C pins shared with SCI2 and IIC
• Eight port D pins shared with TPM1 and TPM2
• Eight port E pins shared with SCI1 and SPI
• Eight high-current port F pins
• Eight port G pins shared with EXTAL, XTAL, and BKGD/MS
8.3 Pin Descriptions
The MC9S08GB/GT has a total of 56 parallel I/O pins (one is output only) in seven 8-bit ports
(PTA–PTG). Not all pins are bonded out in all packages. Consult the pin assignment in the Pins and
Connections section for available parallel I/O pins. All of these pins are available for general-purpose I/O
when they are not used by other on-chip peripheral systems.
After reset, BKGD/MS is enabled and therefore is not usable as an output pin until BKGDPE in SOPT is
cleared. The rest of the peripheral functions are disabled. After reset, all data direction and pullup enable
controls are set to 0s. These pins default to being high-impedance inputs with on-chip pullup devices
disabled.
The following paragraphs discuss each port and the software controls that determine each pin’s use.
8.3.1 Port A and Keyboard Interrupts
V{P
Figure 8-2 Port A Pin Names
Port A is an 8-bit port shared among the KBI keyboard interrupt inputs and general-purpose I/O. Any pins
enabled as KBI inputs will be forced to act as inputs.
Port A Bit 7 654321Bit 0
MCU Pin: PTA7/
KBIP7
PTA6/
KBIP6
PTA5/
KBIP5
PTA4/
KBIP4
PTA3/
KBIP3
PTA2/
KBIP2
PTA1/
KBIP1
PTA0/
KBIP0
Parallel Input/Output
MC9S08GB/GT132 MOTOROLA
Port A pins are available as general-purpose I/O pins controlled by the port A data (PTAD), data direction
(PTADD), pullup enable (PTAPE) and slew rate control (PTASE) registers. Refer to 8.4 Parallel I/O
Controls for more information about general-pupose I/O control.
Port A can be configured to be keyboard interrupt input pins. Refer to the Keyboard Interrupt (KBI)
Module section for more information about using port A pins as keyboard interrupts pins.
8.3.2 Port B and Analog to Digital Converter Inputs
Figure 8-3 Port B Pin Names
Port B is an 8-bit port shared among the ATD inputs and general-purpose I/O. Any pin enabled as ATD
inputs will be forced to act as inputs.
Port B pins are available as general-purpose I/O pins controlled by the port B data (PTBD), data direction
(PTBDD), pullup enable (PTBPE), and slew rate control (PTBSE) registers. Refer to 8.4 Parallel I/O
Controls for more information about general-pupose I/O control.
When the ATD module is enabled, analog pin enables are used to specify which pins on port B will be
used as ATD inputs. Refer to the Analog-to-Digital Converter (ATD) Module section for more
information about using port B as a ATD pins.
8.3.3 Port C and SCI2, IIC, and High-Current Drivers
Figure 8-4 Port C Pin Names
Port C is an 8-bit port which is shared among the SCI2 and IIC modules, and general-purpose I/O. When
SCI2 or IIC modules are enabled the pin direction will be controlled by the module or function. Port C has
high current output drivers.
Port C pins are available as general-purpose I/O pins controlled by the port C data (PTCD), data direction
(PTCDD), pullup enable (PTCPE) and slew rate control (PTCSE) registers. Refer to 8.4 Parallel I/O
Controls for more information about general-pupose I/O control.
When the SCI2 module is enabled, PTC0 serves as the SCI2 module’s transmit pin (TxD2) and PTC1
serves as the receive pin (RxD2). Refer to the Serial Communications Interface (SCI) Module section
for more information about using PTC0 and PTC1 as SCI pins
Port B Bit 7 654321Bit 0
MCU Pin: PTB7/
AD7
PTB6/
AD6
PTB5/
AD5
PTB4/
AD4
PTB3/
AD3
PTB2/
AD2
PTB1/
AD1
PTB0/
AD0
Port C Bit 7 653321Bit 0
MCU Pin: PTC7 PTC6 PTC5 PTC4 PTC3/
SCL
PTC2/
SDA
PTC1/
RxD2
PTC0/
TxD2
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 133MC9S08GB/GT
When the IIC module is enabled, PTC2 serves as the IIC modules’s serial data input/output pin (SDA) and
PTC3 serves as the clock pin (SCL). Refer to the Inter-IntegratedCircuit(IIC)Modulesection for more
information about using PTC2 and PTC3 as IIC pins.
8.3.4 Port D, TPM1 and TPM2
Figure 8-5 Port D Pin Names
Port D is an 8-bit port shared with the two TPM modules, TPM1 and TPM2 and general-purpose I/O.
When the TPM1 or TPM2 modules are enabled in output compare or input captures modes of operation,
the pin direction will be controlled by the module function.
Port D pins are available as general-purpose I/O pins controlled by the port D data (PTDD), data direction
(PTDDD), pullup enable (PTDPE), and slew rate control (PTDSE) registers. Refer to 8.4 Parallel I/O
Controls for more information about general-pupose I/O control.
The TPM2 module can be configured to use PTD7–PTD3 as either input capture, output compare, PWM,
or external clock input pins. Refer to the Timer/PWM(TPM)Module section for more information about
using PTD7–PTD3 as timer pins.
The TPM1 module can be configured to use PTD2–PTD0 as either input capture, output compare, PWM,
or external clock input pins. Refer to the Timer/PWM(TPM)Module section for more information about
using PTD2–PTD0 as timer pins.
8.3.5 Port E, SCI1, and SPI
Figure 8-6 Port E Pin Names
Port E is an 8-bit port shared with the SCI1 module, SPI module, and general-purpose I/O. When the SCI
or SPI modules are enabled, the pin direction will be controlled by the module function.
Port E pins are available as general-purpose I/O pins controlled by the port E data (PTED), data direction
(PTEDD), pullup enable (PTEPE) and slew rate control (PTESE) registers. Refer to 8.4 Parallel I/O
Controls for more information about general-pupose I/O control.
When the SCI1 module is enabled, PTE0 serves as the SCI1 module’s transmit pin (TxD1) and PTDE1
serves as the receive pin (RxD1). Refer to the Serial Communications Interface (SCI) Module section
for more information about using PTE0 and PTE1 as SCI pins.
Port D Bit 7 654321Bit 0
MCU Pin: PTD7/
TPM2CH4
PTD6/
TPM2CH3
PTD5/
TPM2CH2
PTD4/
TPM2CH1
PTD3/
TPM2CH0
PTD2/
TPM1CH2
PTD1/
TPM1CH1
PTD0/
TPM1CH0
Port E Bit 7 654321Bit 0
MCU Pin: PTE7 PTE6 PTE5/
SPSCK
PTE4/
MOSI
PTE3/
MISO
PTE2/
SS
PTE1/
RxD1
PTE0/
TxD1
Parallel Input/Output
MC9S08GB/GT134 MOTOROLA
When the SPI module is enabled, PTE2 serves as the SPI module’s slave select pin (SS), PTE3 serves as
the master-in slave-out pin (MISO), PTE4 serves as the master-out slave-in pin (MOSI), and PTE5 serves
as the SPI clock pin (SPSCK). Refer to the Serial Peripheral Interface (SPI) Module section for more
information about using PTE5–PTE2 as SPI pins.
8.3.6 Port F and High-Current Drivers
Figure 8-7 Port F Pin Names
Port F is an 8-bit port general-purpose I/O that is not shared with any peripheral module. Port F has high
current output drivers.
Port F pins are available as general-purpose I/O pins controlled by the port F data (PTFD), data direction
(PTFDD), pullup enable (PTFPE), and slew rate control (PTFSE) registers. Refer to 8.4 Parallel I/O
Controls for more information about general-pupose I/O control.
8.3.7 Port G, BKGD/MS, and Oscillator
Figure 8-8 Port G Pin Names
Port G is an 8-bit port which is shared among the background/mode select function and general-purpose
I/O. When the background/mode select function or oscillator is enabled, the pin direction will be
controlled by the module function.
Port G pins are available as general-purpose I/O pins controlled by the port G data (PTGD), data direction
(PTGDD), pullup enable (PTGPE), and slew rate control (PTGSE) registers. Refer to 8.4 Parallel I/O
Controls for more information about general-pupose I/O control.
BKGD/MS has an internal pullup, regardless of the PTGPE bits when their background/mode select
function is enabled. During reset, the BKGD/MS pin functions as a mode select pin. Once the MCU is out
of reset, the BKGD/MS pin becomes the background communications input/output pin. The PTG0 can be
configured to be a general-purpose output pin. Refer to the Modes of Operation section, the Resets,
Interrupts, and System Configuration section, and the Development Support section for more
information about using this pin.
The ICG module can be configured to use PTG2–PTG1 ports as crystal oscillator or external clock pins.
Refer to the Internal Clock Generator (ICG) Module section for more information about using these
pins as oscillator pins.
Port F Bit 7 654321Bit 0
MCU Pin: PTF7 PTF6 PTF5 PTF4 PTF3 PTF2 PTF1 PTF0
Port G Bit 7 654321Bit 0
MCU Pin: PTG7 PTG6 PTG5 PTG4 PTG3 PTG2/
EXTAL
PTG1/
XTAL
PTG0/
BKGD/MS
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 135MC9S08GB/GT
8.4 Parallel I/O Controls
Providedno higher-priorityon-chip peripheral is controlling aport pin,the pins operateas general-purpose
I/O pins that are accessed and controlled by a data register (PTxD), a data direction register (PTxDD), a
pullup enable register (PTxPE), and a slew rate control register (PTxSE) where x is A, B, C, D, E, F, or G.
Reads of the data register return the pin value (if PTxDDn = 0) or the contents of the port data register (if
PTxDDn = 1). Writes to the port data register are latched into the port register whether the pin is controlled
by an on-chip peripheral or the pin is configured as an input. If the corresponding pin is not controlled by
another higher-priority peripheral and is configured as an output, this level will be driven out the port pin.
8.4.1 Data Direction Control
The data direction control bits determine whether the pin output driver is enabled, and they control what
is read for port data register reads. Each port pin has a data direction control bit. When PTxDDn = 0, the
corresponding pin is an input and reads of PTxD return the pin value. When PTxDDn = 1, the
corresponding pin is an output and reads of PTxD return the last value written to the port data register.
When a peripheral system is in control of a port pin, the data direction control still controls what is returned
for reads of the port data register, even though the peripheral system has overriding control of the actual
pin direction.
For the MC9S08GB/GT MCU, reads of PTG0/BKGD/MS will return the value on the output pin.
It is a good programming practice to write to the port data register before changing the direction of a port
pin to become an output. This ensures that the pin will not be driven momentarily with an old data value
that happened to be in the port data register.
8.4.2 Internal Pullup Control
An internal pullup device can be enabled for each port pin that is configured as an input (PTxDDn = 0).
The pullup device is available for a peripheral module to use, provided the peripheral is enabled and is an
input function as long as the PTxDDn = 0.
For the four configurable KBI module inputs on PTA7–PTA4, when the pin is configured to detect rising
edges, the pullup enables select pulldown rather than pullup devices.
8.4.3 Slew Rate Control
Slew rate control can be enabled for each port pin that is configured as an output (PTxDDn = 1) or if a
peripheral module is enabled and its function is an output. Not all peripheral modules outputs have slew
rate control, refer to the Pins and Connections section for more information about which pins have slew
rate control.
Parallel Input/Output
MC9S08GB/GT136 MOTOROLA
8.5 Stop Modes
Depending on the stop mode, I/O functions differently as the result of executing a STOP instruction. An
explanation of I/O behavior for the various stop modes follows:
• Stop1mode is the lowestcurrent stop mode.All I/O states arelost in this mode. Upon recovery from
stop1, all I/O must be initialized as if the MCU were undergoing an initial power-up.
• Stop2 mode is a partial power-down mode, whereby I/O latches are maintained in their state as
before the STOP instruction was executed. CPU register status and the state of I/O registers should
be saved in RAM before the STOP instruction is executed to place the MCU in stop2 mode. Upon
recovery from stop2 mode, before accessing any I/O, the user should examine the state of the PPDF
bit in the SPMSC2 register. If the PPDF bit is 0, I/O must be initialized as if a power on reset had
occurred. If the PPDF bit is 1, I/O data previously stored in RAM, before the STOP instruction was
executed,peripherals mayrequire being initializedand restoredto their pre-stopcondition. Theuser
must then write a 1 to the PPDACK bit in the SPMSC2 register. Access to I/O is now permitted
again in the user’s application program.
• In stop3 mode, all I/O is maintained because internal logic circuity stays powered up. Upon
recovery, normal I/O function is available to the user.
8.6 Parallel I/O Registers and Control Bits
This section provides information about all registers and control bits associated with the parallel I/O ports.
Refer to tables in the Memory section for the absolute address assignments for all parallel I/O registers.
This section refers to registers and control bits only by their names. A Motorola-provided equate or header
file normally is used to translate these names into the appropriate absolute addresses.
8.6.1 Port A Registers (PTAD, PTAPE, PTASE, and PTADD)
Port A includes eight pins shared between general-purpose I/O and the KBI module. Port A pins used as
general-purposeI/O pins are controlled by the port A data(PTAD), data direction (PTADD), pullupenable
(PTAPE) and slew rate control (PTASE) registers.
If the KBI takes control of a port A pin, the corresponding PTASE bit is ignored since the pin functions as
aninput. As long as PTADDis a logic 0, thePTAPE controls the pullup enable for the KBI function. Reads
of PTAD will return the logic value of the corresponding pin, provided PTADD is a logic 0.
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 137MC9S08GB/GT
Figure 8-9 Port A Registers
PTADn — Port A Data Register Bit n (n = 0–7)
For port A pins that are inputs, reads return the logic level on the pin. For port A pins that are
configured as outputs, reads return the last value written to this register.
Writes are latched into all bits of this register. For port A pins that are configured as outputs, the logic
level is driven out the corresponding MCU pin.
Reset forces PTAD to all 0s, but these 0s are not driven out the corresponding pins because reset also
configures all port pins as high-impedance inputs with pullups disabled.
PTAPEn — Pullup Enable for Port A Bit n (n = 0–7)
For port A pins that are inputs, these read/write control bits determine whether internal pullup devices
are enabled provided the corresponding PTADDn is a logic 0. For port A pins that are configured as
outputs, these bits are ignored and the internal pullup devices are disabled. When any of bits 7 through
4 of port A are enabled as KBI inputs and are configured to detect rising edges/high levels, the pullup
enable bits enable pulldown rather than pullup devices.
1 = Internal pullup device enabled.
0 = Internal pullup device disabled.
PTAD Bit 7 654321Bit 0
Read:
PTAD7 PTAD6 PTAD5 PTAD4 PTAD3 PTAD2 PTAD1 PTAD0
Write:
Reset: 00000000
PTAPE
Read:
PTAPE7 PTAPE6 PTAPE5 PTAPE4 PTAPE3 PTAPE2 PTAPE1 PTAPE0
Write:
Reset: 00000000
PTASE
Read:
PTASE7 PTASE6 PTASE5 PTASE4 PTASE3 PTASE2 PTASE1 PTASE0
Write:
Reset: 00000000
PTADD
Read:
PTADD7 PTADD6 PTADD5 PTADD4 PTADD3 PTADD2 PTADD1 PTADD0
Write:
Reset: 00000000
Parallel Input/Output
MC9S08GB/GT138 MOTOROLA
PTASEn — Slew Rate Control Enable for Port A Bit n (n = 0–7)
For port A pins that are outputs, these read/write control bits determine whether the slew rate
controlled outputs are enabled. For port A pins that are configured as inputs, these bits are ignored.
1 = Slew rate control enabled.
0 = Slew rate control disabled.
PTADDn — Data Direction for Port A Bit n (n = 0–7)
These read/write bits control the direction of port A pins and what is read for PTAD reads.
1 = Output driver enabled for port A bit n and PTAD reads return the contents of PTADn.
0 = Input (output driver disabled) and reads return the pin value.
8.6.2 Port B Registers (PTBD, PTBPE, PTBSE, and PTBDD)
Port B includes eight general-purpose I/O pins that share with the ATD function. Port B pins used as
general-purpose I/O pins are controlled by the port B data (PTBD), data direction (PTBDD), pullup enable
(PTBPE) and slew rate control (PTBSE) registers.
If the ATD takes control of a port B pin, the corresponding PTBDD, PTBSE, PTBPE bits are ignored.
When a port B pin is being used as an ATD pin, reads of PTBD will return a logic 0 of the corresponding
pin, provided PTBDD is a logic 0.
Figure 8-10 Port B Registers
PTBD Bit 7 654321Bit 0
Read:
PTBD7 PTBD6 PTBD5 PTBD4 PTBD3 PTBD2 PTBD1 PTBD0
Write:
Reset: 00000000
PTBPE
Read:
PTBPE7 PTBPE6 PTBPE5 PTBPE4 PTBPE3 PTBPE2 PTBPE1 PTBPE0
Write:
Reset: 00000000
PTBSE
Read:
PTBSE7 PTBSE6 PTBSE5 PTBSE4 PTBSE3 PTBSE2 PTBSE1 PTBSE0
Write:
Reset: 00000000
PTBDD
Read:
PTBDD7 PTBDD6 PTBDD5 PTBDD4 PTBDD3 PTBDD2 PTBDD1 PTBDD0
Write:
Reset: 00000000
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 139MC9S08GB/GT
PTBDn — Port B Data Register Bit n (n = 0–7)
Forport B pins that are inputs, readsreturn the logiclevel on the pin.For port Bpins that are configured
as outputs, reads return the last value written to this register.
Writes are latched into all bits of this register. For port B pins that are configured as outputs, the logic
level is driven out the corresponding MCU pin.
Reset forces PTBD to all 0s, but these 0s are not driven out on the corresponding pins because reset
also configures all port pins as high-impedance inputs with pullups disabled.
PTBPEn — Pullup Enable for Port B Bit n (n = 0–7)
For port B pins that are inputs, these read/write control bits determine whether internal pullup devices
are enabled. For port B pins that are configured as outputs, these bits are ignored and the internal pullup
devices are disabled.
1 = Internal pullup device enabled.
0 = Internal pullup device disabled.
PTBSEn — Slew Rate Control Enable for Port B Bit n (n = 0–7)
Forport B pinsthat are outputs,these read/write controlbits determine whetherthe slew ratecontrolled
outputs are enabled. For port B pins that are configured as inputs, these bits are ignored.
1 = Slew rate control enabled.
0 = Slew rate control disabled.
PTBDDn — Data Direction for Port B Bit n (n = 0–7)
These read/write bits control the direction of port B pins and what is read for PTBD reads.
1 = Output driver enabled for port B bit n and PTBD reads return the contents of PTBDn.
0 = Input (output driver disabled) and reads return the pin value.
8.6.3 Port C Registers (PTCD, PTCPE, PTCSE, and PTCDD)
Port C includes eight general-purpose I/O pins that share with the SCI2 and IIC modules. Port C pins used
as general-purpose I/O pins are controlled by the port C data (PTCD), data direction (PTCDD), pullup
enable (PTCPE) and slew rate control (PTCSE) registers.
If the SCI2 takes control of a port C pin, the corresponding PTCDD bit are ignored. PTCSE can be used
to provide slew rate on the SCI2 transmit pin, TxD2. PTCPE can be used, provided the corresponding
PTCDD bit is a logic 0, to provide a pullup device on the SCI2 receive pin, RxD2.
If the IIC takes control of a port C pin, the corresponding PTCDD bit are ignored. PTCSE can be used to
provide slew rate on the IIC serial data pin (SDA), when in output mode and the IIC clock pin (SCL).
PTCPE can be used, provided the corresponding PTCDD bit is a logic 0, to provide a pullup device on the
IIC serial data pin, when in receive mode.
Reads of PTCD will return the logic value of the corresponding pin, provided PTCDD is a logic 0.
Parallel Input/Output
MC9S08GB/GT140 MOTOROLA
Figure 8-11 Port C Registers
PTCDn — Port C Data Register Bit n (n = 0–7)
Forport C pins that are inputs, readsreturn the logiclevel on the pin.For port Cpins that are configured
as outputs, reads return the last value written to this register.
Writes are latched into all bits of this register. For port C pins that are configured as outputs, the logic
level is driven out the corresponding MCU pin.
Reset forces PTCD to all 0s, but these 0s are not driven out the corresponding pins because reset also
configures all port pins as high-impedance inputs with pullups disabled.
PTCPEn — Pullup Enable for Port C Bit n (n = 0–7)
For port C pins that are inputs, these read/write control bits determine whether internal pullup devices
are enabled. For port C pins that are configured as outputs, these bits are ignored and the internal pullup
devices are disabled.
1 = Internal pullup device enabled.
0 = Internal pullup device disabled.
PTCSEn — Slew Rate Control Enable for Port C Bit n (n = 0–7)
Forport C pinsthat are outputs,these read/write controlbits determine whetherthe slew ratecontrolled
outputs are enabled. For port B pins that are configured as inputs, these bits are ignored.
1 = Slew rate control enabled.
0 = Slew rate control disabled.
PTCD Bit 7 654321Bit 0
Read:
PTCD7 PTCD6 PTCD5 PTCD4 PTCD3 PTCD2 PTCD1 PTCD0
Write:
Reset: 00000000
PTCPE
Read:
PTCPE7 PTCPE6 PTCPE5 PTCPE4 PTCPE3 PTCPE2 PTCPE1 PTCPE0
Write:
Reset: 00000000
PTCSE
Read:
PTCSE7 PTCSE6 PTCSE5 PTCSE4 PTCSE3 PTCSE2 PTCSE1 PTCSE0
Write:
Reset: 00000000
PTCDD
Read:
PTCDD7 PTCDD6 PTCDD5 PTCDD4 PTCDD3 PTCDD2 PTCDD1 PTCDD0
Write:
Reset: 00000000
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 141MC9S08GB/GT
PTCDDn — Data Direction for Port C Bit n (n = 0–7)
These read/write bits control the direction of port C pins and what is read for PTCD reads.
1 = Output driver enabled for port C bit n and PTCD reads return the contents of PTCDn.
0 = Input (output driver disabled) and reads return the pin value.
8.6.4 Port D Registers (PTDD, PTDPE, PTDSE, and PTDDD)
Port D includes eight pins shared between general-purpose I/O, TPM1 and TPM2. Port D pins used as
general-purpose I/O pins are controlled by the port D data (PTDD), data direction (PTDDD) and pullup
enable (PTDPE) and slew rate control (PTDSE) registers.
If a TPM takes control of a port D pin, the corresponding PTDDD bit are ignored. When the TPM is in
output compare mode, the corresponding PTDSE can be used to provide slew rate on the pin. When the
TPM is in input capture mode, the corresponding PTDPE can be used, provided the corresponding
PTDDD bit is a logic 0, to provide a pullup device on the pin.
Reads of PTDD will return the logic value of the corresponding pin, provided PTDDD is a logic 0.
Figure 8-12 Port D Registers
PTDD Bit 7 654321Bit 0
Read:
PTDD7 PTDD6 PTDD5 PTDD4 PTDD3 PTDD2 PTDD1 PTDD0
Write:
Reset: 00000000
PTDPE
Read:
PTDPE7 PTDPE6 PTDPE5 PTDPE4 PTDPE3 PTDPE2 PTDPE1 PTDPE0
Write:
Reset: 00000000
PTDSE
Read:
PTDSE7 PTDSE6 PTDSE5 PTDSE4 PTDSE3 PTDSE2 PTDSE1 PTDSE0
Write:
Reset: 00000000
PTDDD
Read:
PTDDD7 PTDDD6 PTDDD5 PTDDD4 PTDDD3 PTDDD2 PTDDD1 PTDDD0
Write:
Reset: 00000000
Parallel Input/Output
MC9S08GB/GT142 MOTOROLA
PTDDn — Port D Data Register Bit n (n = 0–7)
For port D pins that are inputs, reads return the logic level on the pin. For port D pins that are
configured as outputs, reads return the last value written to this register.
Writes are latched into all bits of this register. For port D pins that are configured as outputs, the logic
level is driven out the corresponding MCU pin.
Reset forces PTDD to all 0s, but these 0s are not driven out the corresponding pins because reset also
configures all port pins as high-impedance inputs with pullups disabled.
PTDPEn — Pullup Enable for Port D Bit n (n = 0–7)
For port D pins that are inputs, these read/write control bits determine whether internal pullup devices
areenabled. For portD pins thatare configured asoutputs, these bitsare ignored and the internal pullup
devices are disabled.
1 = Internal pullup device enabled.
0 = Internal pullup device disabled.
PTDSEn — Slew Rate Control Enable for Port D Bit n (n = 0–7)
For port D pins that are outputs, these read/write control bits determine whether the slew rate
controlled outputs are enabled. For port D pins that are configured as inputs, these bits are ignored.
1 = Slew rate control enabled.
0 = Slew rate control disabled.
PTDDDn — Data Direction for Port D Bit n (n = 0–7)
These read/write bits control the direction of port D pins and what is read for PTDD reads.
1 = Output driver enabled for port D bit n and PTDD reads return the contents of PTDDn.
0 = Input (output driver disabled) and reads return the pin value.
8.6.5 Port E Registers (PTED, PTEPE, PTESE, and PTEDD)
Port E includes eight general-purpose I/O pins that share with the SCI1 and SPI modules. Port E pins used
as general-purpose I/O pins are controlled by the port E data (PTED), data direction (PTEDD), pullup
enable (PTEPE) and slew rate control (PTESE) registers.
If the SCI1 takes control of a port E pin, the corresponding PTEDD bit are ignored. PTESE can be used to
provide slew rate on the SCI1 transmit pin, TxD1. PTEPE can be used, provided the corresponding
PTEDD bit is a logic 0, to provide a pullup device on the SCI1 receive pin, RxD1.
If the SPI takes control of a port E pin, the corresponding PTEDD bit are ignored. PTESE can be used to
provide slew rate on the SPI serial output pin (MOSI or MISO) and serial clock pin (SPCLK) depending
on the SPI operational mode. PTEPE can be used, provided the corresponding PTEDD bit is a logic 0, to
provide a pullup device on the SPI serial input pins (MOSI or MISO) and slave select pin (SS) depending
on the SPI operational mode.
Reads of PTED will return the logic value of the corresponding pin, provided PTEDD is a logic 0.
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 143MC9S08GB/GT
Figure 8-13 Port E Registers
PTEDn — Port E Data Register Bit n (n = 0–7)
For port E pins that are inputs, reads return the logic level on the pin. For port E pins that are configured
as outputs, reads return the last value written to this register.
Writes are latched into all bits of this register. For port E pins that are configured as outputs, the logic
level is driven out the corresponding MCU pin.
Reset forces PTED to all 0s, but these 0s are not driven out the corresponding pins because reset also
configures all port pins as high-impedance inputs with pullups disabled.
PTEPEn — Pullup Enable for Port E Bit n (n = 0–7)
For port E pins that are inputs, these read/write control bits determine whether internal pullup devices
are enabled. For port E pins that are configured as outputs, these bits are ignored and the internal pullup
devices are disabled.
1 = Internal pullup device enabled.
0 = Internal pullup device disabled.
PTESEn — Slew Rate Control Enable for Port E Bit n (n = 0–7)
For port E pins that are outputs, these read/write control bits determine whether the slew rate controlled
outputs are enabled. For port E pins that are configured as inputs, these bits are ignored.
1 = Slew rate control enabled.
0 = Slew rate control disabled.
PTED Bit 7 654321Bit 0
Read: PTED7 PTED6 PTED5 PTED4 PTED3 PTED2 PTED1 PTED0
Write:
Reset: 00000000
PTEPE
Read: PTEPE7 PTEPE6 PTEPE5 PTEPE4 PTEPE3 PTEPE2 PTEPE1 PTEPE0
Write:
Reset: 00000000
PTESE
Read: PTESE7 PTESE6 PTESE5 PTESE4 PTESE3 PTESE2 PTESE1 PTESE0
Write:
Reset: 00000000
PTEDD
Read: PTEDD7 PTEDD6 PTEDD5 PTEDD4 PTEDD3 PTEDD2 PTEDD1 PTEDD0
Write:
Reset: 00000000
Parallel Input/Output
MC9S08GB/GT144 MOTOROLA
PTEDDn — Data Direction for Port E Bit n (n = 0–7)
These read/write bits control the direction of port E pins and what is read for PTED reads.
1 = Output driver enabled for port E bit n and PTED reads return the contents of PTEDn.
0 = Input (output driver disabled) and reads return the pin value.
8.6.6 Port F Registers (PTFD, PTFPE, PTFSE, and PTFDD)
Port F includes eight general-purpose I/O pins that are not shared with any peripheral module. Port F pins
used as general-purpose I/O pins are controlled by the port F data (PTFD), data direction (PTFDD), pullup
enable (PTFPE), and slew rate control (PTFSE) registers.
Figure 8-14 Port F Registers
PTFDn — Port PTF Data Register Bit n (n = 0–7)
For port F pins that are inputs, reads return the logic level on the pin. For port F pins that are configured
as outputs, reads return the last value written to this register.
Writes are latched into all bits of this register. For port F pins that are configured as outputs, the logic
level is driven out the corresponding MCU pin.
Reset forces PTFD to all 0s, but these 0s are not driven out the corresponding pins because reset also
configures all port pins as high-impedance inputs with pullups disabled.
PTFD Bit 7 654321Bit 0
Read:
PTFD7 PTFD6 PTFD5 PTFD4 PTFD3 PTFD2 PTFD1 PTFD0
Write:
Reset: 00000000
PTFPE
Read:
PTFPE7 PTFPE6 PTFPE5 PTFPE4 PTFPE3 PTFPE2 PTFPE1 PTFPE0
Write:
Reset: 00000000
PTFSE
Read:
PTFSE7 PTFSE6 PTFSE5 PTFSE4 PTFSE3 PTFSE2 PTFSE1 PTFSE0
Write:
Reset: 00000000
PTFDD
Read:
PTFDD7 PTFDD6 PTFDD5 PTFDD4 PTFDD3 PTFDD2 PTFDD1 PTFDD0
Write:
Reset: 00000000
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 145MC9S08GB/GT
PTFPEn — Pullup Enable for Port F Bit n (n = 0–7)
For port F pins that are inputs, these read/write control bits determine whether internal pullup devices
are enabled. For port F pins that are configured as outputs, these bits are ignored and the internal pullup
devices are disabled.
1 = Internal pullup device enabled.
0 = Internal pullup device disabled.
PTFSEn — Slew Rate Control Enable for Port F Bit n (n = 0–7)
For port F pins that are outputs, these read/write control bits determine whether the slew rate controlled
outputs are enabled. For port F pins that are configured as inputs, these bits are ignored.
1 = Slew rate control enabled.
0 = Slew rate control disabled.
PTFDDn — Data Direction for Port F Bit n (n = 0–7)
These read/write bits control the direction of port F pins and what is read for PTFD reads.
1 = Output driver enabled for port F bit n and PTFD reads return the contents of PTFDn.
0 = Input (output driver disabled) and reads return the pin value.
8.6.7 Port G Registers (PTGD, PTGPE, PTGSE, and PTGDD)
Port G includes eight general-purpose I/O pins that are shared with BKGD/MS function and the oscillator
or external clock pins. Port G pins used as general-purpose I/O pins are controlled by the port G data
(PTGD), data direction (PTGDD), pullup enable (PTGPE), and slew rate control (PTGSE) registers.
Port pin PTG0, while in reset, defaults to the BKGD/MS pin. Once the MCU is out of reset, PTG0 can be
configured to be a general-purpose output pin. When BKGD/MS takes control of PTG0, the corresponding
PTGDD, PTGPE, and PTGPSE bits are ignored.
Port pin PTG1 and PTG2 can be configured to be oscillator or external clock pins. When the oscillator
takes control of a port G pin, the corresponding PTGD, PTGDD, PTGSE, and PTGPE bits are ignored.
Reads of PTGD will return the logic value of the corresponding pin, provided PTGDD is a logic 0.
Parallel Input/Output
MC9S08GB/GT146 MOTOROLA
Figure 8-15 Port G Registers
PTGDn — Port PTG Data Register Bit n (n = 0–7)
For port G pins that are inputs, reads return the logic level on the pin. For port G pins that are
configured as outputs, reads return the last value written to this register.
Writes are latched into all bits of this register. For port G pins that are configured as outputs, the logic
level is driven out the corresponding MCU pin.
Reset forces PTGD to all 0s, but these 0s are not driven out the corresponding pins because reset also
configures all port pins as high-impedance inputs with pullups disabled.
PTGPEn — Pullup Enable for Port G Bit n (n = 0–7)
For port G pins that are inputs, these read/write control bits determine whether internal pullup devices
areenabled. For portG pins thatare configured asoutputs, these bitsare ignored and the internal pullup
devices are disabled.
1 = Internal pullup device enabled.
0 = Internal pullup device disabled.
PTGSEn — Slew Rate Control Enable for Port G Bit n (n = 0–7)
For port G pins that are outputs, these read/write control bits determine whether the slew rate
controlled outputs are enabled. For port G pins that are configured as inputs, these bits are ignored.
1 = Slew rate control enabled.
0 = Slew rate control disabled.
PTGD Bit 7 654321Bit 0
Read:
PTGD7 PTGD6 PTGD5 PTGD4 PTGD3 PTGD2 PTGD1 PTGD0
Write:
Reset: 00000000
PTGPE
Read:
PTGPE7 PTGPE6 PTGPE5 PTGPE4 PTGPE3 PTGPE2 PTGPE1 PTGPE0
Write:
Reset: 00000000
PTGSE
Read:
PTGSE7 PTGSE6 PTGSE5 PTGSE4 PTGSE3 PTGSE2 PTGSE1 PTGSE0
Write:
Reset: 00000000
PTGDD
Read:
PTGDD7 PTGDD6 PTGDD5 PTGDD4 PTGDD3 PTGDD2 PTGDD1 PTGDD0
Write:
Reset: 00000000
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 147MC9S08GB/GT
PTGDDn — Data Direction for Port G Bit n (n = 0–7)
These read/write bits control the direction of port G pins and what is read for PTGD reads.
1 = Output driver enabled for port G bit n and PTGD reads return the contents of PTGDn.
0 = Input (output driver disabled) and reads return the pin value.
Parallel Input/Output
MC9S08GB/GT148 MOTOROLA
Data Sheet — MC9S08GB60/D V1.0
MOTOROLA 149MC9S08GB/GT
Section 9 Keyboard Interrupt (KBI) Module
9.1 Introduction
The MC9S08GB/GT has one KBI module with eight keyboard interrupt inputs that share port A pins. See
the Pins and Connections section for more information about the logic and hardware aspects of these
pins.
9.1.1 Port A and Keyboard Interrupt Pins
Figure 9-1 Port A Pin Names
The following paragraphs discuss controlling the keyboard interrupt pins.
Port A is an 8-bit port which is shared among the KBI keyboard interrupt inputs and general-purpose I/O.
The eight KBIPEn control bits in the KBIPE register allow selection of any combination of port A pins to
be assigned as KBI inputs. Any pins which are enabled as KBI inputs will be forced to act as inputs and
the remaining port A pins are available as general-purpose I/O pins controlled by the port A data (PTAD),
data direction (PTADD) and pullup enable (PTAPE) registers.
KBI inputs can be configured for edge-only sensitivity or edge-and-level sensitivity. Bits 3 through 0 of
port A are falling-edge/low-level sensitive while bits 7 through 4 can be configured for
rising-edge/high-level or for falling-edge/low-level sensitivity.
The eight PTAPEn control bits in the PTAPE register allow you to select whether an internal pullup device
is enabled on each port A pin that is configured as an input. When any of bits 7 through 4 of port A are
enabled as KBI inputs and are configured to detect rising edges/high levels, the pullup enable bits enable
pulldown rather than pullup devices.
An enabled keyboard interrupt can be used to wake the MCU from wait or standby (stop3).
9.2 Features
The keyboard interrupt (KBI) module features include:
• Keyboard interrupts selectable on eight port pins:
– Four falling edge/low level sensitive
– Four falling edge/low level or rising edge/high level sensitive
– Choice of edge-only or edge-and-level sensitivity
– Common interrupt flag and interrupt enable control
– Capable of waking up the MCU from stop3 or wait mode
MCU Pin: PTA7/
KBIP7
PTA6/
KBIP6
PTA5/
KBIP5
PTA4/
KBIP4
PTA3/
KBIP3
PTA2/
KBIP2
PTA1/
KBIP1
PTA0/
KBIP0
Keyboard Interrupt (KBI) ModuleKeyboard Interrupt (KBI) Module
MC9S08GB/GT150 MOTOROLA
Figure 9-2 Block Diagram Highlighting KBI Module
PTD3/TPM2CH0
PTD4/TPM2CH1
PTD5/TPM2CH2
PTD6/TPM2CH3
PTC1/RxD2
PTC0/TxD2
VSS
VDD
PTE3/MISO
PTE2/SS
PTA7/KBIP7–
PTE0/TxD1
PTE1/RxD1
PTD2/TPM1CH2
PTD1/TPM1CH1
PTD0/TPM1CH0
PTC7
PTC6
PTC5
PTC4
PTC3/SCL
PTC2/SDA
PORT A
PORT C
PORT D
PORT E
8-BIT KEYBOARD
INTERRUPT MODULE (KBI)
IIC MODULE (IIC)
SERIAL PERIPHERAL
INTERFACE MODULE (SPI)
USER FLASH
USER RAM
(GB60 = 4096 BYTES)
DEBUG
MODULE (DBG)
(GB60 = 61,268 BYTES)
HCS08 CORE
CPU
BDC
INT
BKP
NOTES:
1. Port pins are software configurable with pullup device if input port.
2. Pin contains software configurable pullup/pulldown device if IRQ enabled (IRQPE = 1).
3. IRQ does not have a clamp diode to VDD. IRQ should not be driven above VDD.
4. Pin contains integrated pullup device.
5. High current drive
6. Pins PTA[7:4] contain software configurable pullup/pulldown device.
NOTE 1
NOTE 1
3-CHANNEL TIMER/PWM
MODULE (TPM1)
PTB7/AD7–
PORT B
PTE5/SPSCK
PTE4/MOSI
PTE6
PTE7
INTERFACE MODULE (SCI2)
HCS08 SYSTEM CONTROL
RESETS AND INTERRUPTS
MODES OF OPERATION
POWER MANAGEMENT
VOLTAGE
REGULATOR
RTI
SERIAL COMMUNICATIONS
COP
IRQ LVD
INTERNAL BUS
LOW-POWER OSCILLATOR
INTERNAL CLOCK
GENERATOR (ICG)
RESET
VSSAD
VDDAD
VREFH
VREFL
ANALOG-TO-DIGITAL
CONVERTER (ATD)
INTERFACE MODULE (SCI1)
SERIAL COMMUNICATIONS
5-CHANNEL TIMER/PWM
MODULE (TPM2)
PORT F
PTF7–PTF0
NOTE 1
PTD7/TPM2CH4
8
PTA0/KBIP0
8
PTB0/AD0
8
PTG3
PTG2/EXTAL
PTG0/BKGD/MS
PTG1/XTAL
PORT G
PTG4
PTG6
PTG7
PTG5
NOTE 4
NOTES 1, 5
(GB32 = 32,768 BYTES)
(GB32 = 2048 BYTES)
IRQ
NOTES 2, 3
10-BIT
NOTES 1, 6
NOTE 1
NOTES 1, 5