STM8L052R8T6 - STMicroelectronics

This is information on a product in full production.

May 2013 Doc ID023337 Rev 2 1/109

STM8L052R8

Value Line, 8-bit ultralow power MCU, 64-KB Flash,

256-byte data EEPROM, RTC, LCD, timers, USART, I2C, SPI, ADC

Datasheet − production data

Features

■Operating conditions

– Operating power supply: 1.8 V to 3.6 V

– Temperature range: -40 °C to 85 °C

■Low power features

– 5 low power modes: Wait, Low power run

(5.9 µA), Low power wait (3 µA), Active-halt

with full RTC (1.4 µA), Halt (400 nA)

– Dynamic power consumption:

200 µA/MHz + 330 µA

– Ultra-low leakage per I/0: 50 nA

– Fast wakeup from Halt: 4.7 µs

■Advanced STM8 core

– Harvard architecture and 3-stage pipeline

– Max freq. 16 MHz, 16 CISC MIPS peak

– Up to 40 external interrupt sources

■Reset and supply management

– Low power, ultra-safe BOR reset with 5

programmable thresholds

– Ultra low power POR/PDR

– Programmable voltage detector (PVD)

■Clock management

– 32 kHz and 1 to 16 MHz crystal oscillators

– Internal 16 MHz factory-trimmed RC

– 38 kHz low consumption RC

– Clock security system

■Low power RTC

– BCD calendar with alarm interrupt

– Digital calibration with +/- 0.5ppm accuracy

– Advanced anti-tamper detection

■LCD: 8x24 or 4x28 w/ step-up converter

■Memories

– 64 KB Flash program memory and

256 bytes data EEPROM with ECC, RWW

– Flexible write and read protection modes

– 4 KB of RAM

■DMA

– 4 channels supporting ADC, SPIs, I2C,

USARTs, timers

– 1 channel for memory-to-memory

■12-bit ADC up to 1 Msps/27 channels

– Internal reference voltage

■Timers

– Three 16-bit timers with 2 channels (used

as IC, OC, PWM), quadrature encoder

– One 16-bit advanced control timer with 3

channels, supporting motor control

– One 8-bit timer with 7-bit prescaler

– 2 watchdogs: 1 Window, 1 Independent

– Beeper timer with 1, 2 or 4 kHz frequencies

■Communication interfaces

– Two synchronous serial interfaces (SPI)

–Fast I

2C 400 kHz SMBus and PMBus

– Three USARTs (ISO 7816 interface + IrDA)

■Up to 54 I/Os, all mappable on interrupt vectors

■Development support

– Fast on-chip programming and non-

intrusive debugging with SWIM

– Bootloader using USART

LQFP64

www.st.com

Contents STM8L052R8
2/109 Doc ID023337 Rev 2
Contents
Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1 Device overview  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
2 Ultra low power continuum  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  11
Functional overview  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
1 Low power modes   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
2 Central processing unit STM8  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
2.1 Advanced STM8 Core  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.2 Interrupt controller  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3 Reset and supply management  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  15
3.1 Power supply scheme   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.2 Power supply supervisor  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.3 Voltage regulator  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4 Clock management   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  16
5 Low power real-time clock  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  17
6 LCD (Liquid crystal display)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  18
7 Memories  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  18
8 DMA  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  18
9 Analog-to-digital converter  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  19
10 System configuration controller and routing interface   . . . . . . . . . . . . . . .  19
11 Timers   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  19
11.1 TIM1 - 16-bit advanced control timer  . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
11.2 16-bit general purpose timers   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
11.3 8-bit basic timer  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
12 Watchdog timers   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  20
12.1 Window watchdog timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
12.2 Independent watchdog timer  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
13 Beeper  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  21
14 Communication interfaces  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  21
14.1 SPI  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
14.2 I²C   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

STM8L052R8 Contents
Doc ID023337 Rev 2 3/109
14.3 USART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
15 Infrared (IR) interface  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  22
16 Development support  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  22
Pin description   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
1 System configuration options  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  29
Memory and register map   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
1 Memory mapping  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  30
2 Register map  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  31
Interrupt vector mapping  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Option bytes   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Electrical parameters   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
1 Parameter conditions  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  55
1.1 Minimum and maximum values  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
1.2 Typical values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
1.3 Typical curves   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
1.4 Loading capacitor   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
1.5 Pin input voltage   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
2 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  56
3 Operating conditions   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  58
3.1 General operating conditions  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
3.2 Embedded reset and power control block characteristics  . . . . . . . . . . . 59
3.3 Supply current characteristics  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
3.4 Clock and timing characteristics   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
3.5 Memory characteristics  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
3.6 I/O current injection characteristics  . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
3.7 I/O port pin characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
3.8 Communication interfaces  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
3.9 LCD controller  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
3.10 Embedded reference voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
3.11 12-bit ADC1 characteristics  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
3.12 EMC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
4 Thermal characteristics   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  103

Contents STM8L052R8

4/109 Doc ID023337 Rev 2

9 Package characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

9.1 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

10 Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

11 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108

STM8L052R8 List of tables
Doc ID023337 Rev 2 5/109
List of tables
Table 1. High density value line STM8L05xxx low power device features and
peripheral counts  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Table 2. Timer feature comparison. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Table 3. Legend/abbreviation for Table 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Table 4. High density value line STM8L05xxx pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Table 5. Flash and RAM boundary addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Table 6. I/O port hardware register map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Table 7. General hardware register map  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Table 8. CPU/SWIM/debug module/interrupt controller registers . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Table 9. Interrupt mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Table 10. Option byte addresses  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Table 11. Option byte description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Table 12. Voltage characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Table 13. Current characteristics  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Table 14. Thermal characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Table 15. General operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Table 16. Embedded reset and power control block characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . 59
Table 17. Total current consumption in Run mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Table 18. Total current consumption in Wait mode  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Table 19. Total current consumption and timing in Low power run mode at VDD = 1.8 V to
 3.6 V  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Table 20. Total current consumption in Low power wait mode at VDD = 1.8 V to 3.6 V  . . . . . . . . . . 69
Table 21. Total current consumption and timing in Active-halt mode 
 at VDD = 1.8 V to 3.6 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Table 22. Typical current consumption in Active-halt mode, RTC clocked by LSE external crystal . . 71
Table 23. Total current consumption and timing in Halt mode at VDD = 1.8 to 3.6 V  . . . . . . . . . . . . 72
Table 24. Peripheral current consumption  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Table 25. Current consumption under external reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Table 26. HSE external clock characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Table 27. LSE external clock characteristics  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Table 28. HSE oscillator characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Table 29. LSE oscillator characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Table 30. HSI oscillator characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Table 31. LSI oscillator characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Table 32. RAM and hardware registers  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Table 33. Flash program and data EEPROM memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Table 34. I/O current injection susceptibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Table 35. I/O static characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Table 36. Output driving current (high sink ports). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Table 37. Output driving current (true open drain ports). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Table 38. Output driving current (PA0 with high sink LED driver capability). . . . . . . . . . . . . . . . . . . . 85
Table 39. NRST pin characteristics  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Table 40. SPI1 characteristics  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
Table 41. I2C characteristics  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Table 42. LCD characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Table 43. Reference voltage characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Table 44. ADC1 characteristics  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Table 45. ADC1 accuracy with VDDA = 3.3 V to 2.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

List of tables STM8L052R8

6/109 Doc ID023337 Rev 2

Table 46. ADC1 accuracy with VDDA = 2.4 V to 3.6 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

Table 47. ADC1 accuracy with VDDA = VREF+ = 1.8 V to 2.4 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

Table 48. EMS data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

Table 49. EMI data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

Table 50. ESD absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

Table 51. Electrical sensitivities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

Table 52. Thermal characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

Table 53. LQFP64 – 10 x 10 mm, 64-pin low-profile quad flat package mechanical data . . . . . . . . 105

Table 54. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108

STM8L052R8 List of figures
Doc ID023337 Rev 2 7/109
List of figures
Figure 1. High density value line STM8L05xxx device block diagram   . . . . . . . . . . . . . . . . . . . . . . 12
Figure 2. High density value line STM8L05xxx clock tree diagram   . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 3. STM8L052R8 64-pin LQFP64 package pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 4. Memory map  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 5. Pin loading conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Figure 6. Pin input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Figure 7. Power supply thresholds. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Figure 8. Typical IDD(RUN) from RAM vs. VDD (HSI clock source), fCPU =16 MHz 1) . . . . . . . . . . . . . 64
Figure 9. Typical IDD(RUN) from Flash vs. VDD (HSI clock source), fCPU = 16 MHz 1) . . . . . . . . . . . . 64
Figure 10. Typical IDD(Wait) from RAM vs. VDD (HSI clock source), fCPU = 16 MHz 1) . . . . . . . . . . . . . 66
Figure 11. Typical IDD(Wait) from Flash (HSI clock source), fCPU = 16 MHz 1) . . . . . . . . . . . . . . . . . . . 66
Figure 12. Typical IDD(LPR) vs. VDD (LSI clock source), all peripherals OFF . . . . . . . . . . . . . . . . . . . . 68
Figure 13. Typical IDD(LPW) vs. VDD (LSI clock source), all peripherals OFF (1)  . . . . . . . . . . . . . . . . . 69
Figure 14. Typical IDD(AH) vs. VDD (LSI clock source)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Figure 15. Typical IDD(Halt) vs. VDD (internal reference voltage OFF) . . . . . . . . . . . . . . . . . . . . . . . . 72
Figure 16. HSE oscillator circuit diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Figure 17. LSE oscillator circuit diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Figure 18. Typical HSI frequency vs. VDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Figure 19. Typical LSI clock source frequency vs. VDD  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Figure 20. Typical VIL and VIH vs. VDD (standard I/Os). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Figure 21. Typical VIL and VIH vs. VDD (true open drain I/Os). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Figure 22. Typical pull-up resistance RPU vs. VDD with VIN=VSS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Figure 23. Typical pull-up current Ipu vs. VDD with VIN=VSS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Figure 24. Typical VOL @ VDD = 3.0 V (high sink ports)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Figure 25. Typical VOL @ VDD = 1.8 V (high sink ports)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Figure 26. Typical VOL @ VDD = 3.0 V (true open drain ports)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Figure 27. Typical VOL @ VDD = 1.8 V (true open drain ports)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Figure 28. Typical VDD - VOH @ VDD = 3.0 V (high sink ports). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Figure 29. Typical VDD - VOH @ VDD = 1.8 V (high sink ports). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Figure 30. Typical NRST pull-up resistance RPU vs. VDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Figure 31. Typical NRST pull-up current Ipu vs. VDD   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Figure 32. Recommended NRST pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Figure 33. SPI1 timing diagram - slave mode and CPHA=0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Figure 34. SPI1 timing diagram - slave mode and CPHA=1(1)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Figure 35. SPI1 timing diagram - master mode(1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Figure 36. Typical application with I2C bus and timing diagram 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Figure 37. ADC1 accuracy characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Figure 38. Typical connection diagram using the ADC  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Figure 39. Power supply and reference decoupling (VREF+ not connected to VDDA). . . . . . . . . . . . . 100
Figure 40. Power supply and reference decoupling (VREF+ connected to VDDA) . . . . . . . . . . . . . . 100
Figure 41. LQFP64 – 10 x 10 mm, 64 pin low-profile quad flat package outline . . . . . . . . . . . . . . . . 105
Figure 42. Recommended footprint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Figure 43. Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

Introduction STM8L052R8

8/109 Doc ID023337 Rev 2

1 Introduction

This document describes the features, pinout, mechanical data and ordering information of

the high density value line STM8L052R8 microcontroller with a Flash memory density of

64 Kbytes.

For further details on the whole STMicroelectronics high density family please refer to

Section 2.2: Ultra low power continuum.

For detailed information on device operation and registers, refer to the reference manual

(RM0031).

For information on to the Flash program memory and data EEPROM, refer to the

programming manual (PM0054).

For information on the debug module and SWIM (single wire interface module), refer to the

STM8 SWIM communication protocol and debug module user manual (UM0470).

For information on the STM8 core, refer to the STM8 CPU programming manual (PM0044).

High density value line devices provide the following benefits:

●Integrated system

– 64 Kbytes of high density embedded Flash program memory

– 256 bytes of data EEPROM

– 4 Kbytes of RAM

– Internal high speed and low-power low speed RC

– Embedded reset

●Ultra low power consumption

– 1 µA in Active-halt mode

– Clock gated system and optimized power management

– Capability to execute from RAM for Low power wait mode and low power run mode

●Advanced features

– Up to 16 MIPS at 16 MHz CPU clock frequency

– Direct memory access (DMA) for memory-to-memory or peripheral-to-memory

access

● Short development cycles

– Application scalability across a common family product architecture with

compatible pinout, memory map and modular peripherals

– Wide choice of development tools

These features make the value line STM8L05xxx ultra low power microcontroller family

suitable for a wide range of consumer and mass market applications.

Refer to Table 1: High density value line STM8L05xxx low power device features and

peripheral counts and Section 3: Functional overview for an overview of the complete range

of peripherals proposed in this family.

Figure 1 shows the block diagram of the high density value line STM8L05xxx family.

STM8L052R8 Description

Doc ID023337 Rev 2 9/109

2 Description

The high density value line STM8L05xxx devices are members of the STM8L ultra low

power 8-bit family.

The value line STM8L05xxx ultra low power family features the enhanced STM8 CPU core

providing increased processing power (up to 16 MIPS at 16 MHz) while maintaining the

advantages of a CISC architecture with improved code density, a 24-bit linear addressing

space and an optimized architecture for low power operations.

The family includes an integrated debug module with a hardware interface (SWIM) which

allows non-intrusive In-application debugging and ultra-fast Flash programming.

High density value line STM8L05xxx microcontrollers feature embedded data EEPROM and

low-power, low-voltage, single-supply program Flash memory.

All devices offer 12-bit ADC, real-time clock, four 16-bit timers, one 8-bit timer as well as

standard communication interface such as two SPIs, I2C, three USARTs and 8x24 or 4x28-

segment LCD. The 8x24 or 4x 28-segment LCD is available on the high density value line

STM8L05xxx.

The STM8L05xxx family operates from 1.8 V to 3.6 V and is available in the -40 to +85 °C

temperature range.

The modular design of the peripheral set allows the same peripherals to be found in different

ST microcontroller families including 32-bit families. This makes any transition to a different

family very easy, and simplified even more by the use of a common set of development

tools.

All value line STM8L ultra low power products are based on the same architecture with the

same memory mapping and a coherent pinout.

Description STM8L052R8

10/109 Doc ID023337 Rev 2

2.1 Device overview

Table 1. High density value line STM8L05xxx low power device features and

peripheral counts

Features STM8L052R8

Flash (Kbytes) 64

Data EEPROM (bytes) 256

RAM (Kbytes) 4

LCD 8x24 or 4x28

Timers

Basic 1

(8-bit)

General purpose 3

(16-bit)

Advanced control 1

(16-bit)

Communication

interfaces

SPI 2

I2C 1

USART 3

GPIOs 54(1)

1. The number of GPIOs given in this table includes the NRST/PA1 pin but the application can use the

NRST/PA1 pin as general purpose output only (PA1).

12-bit synchronized ADC

(number of channels)

(27)

Others

RTC, window watchdog, independent watchdog,

16-MHz and 38-kHz internal RC,

1- to 16-MHz and 32-kHz external oscillator

CPU frequency 16 MHz

Operating voltage 1.8 V to 3.6 V

Operating temperature -40 to +85 °C

Package LQFP64

STM8L052R8 Description

Doc ID023337 Rev 2 11/109

2.2 Ultra low power continuum

The ultra low power value line STM8L05xxx and STM8L15xxx are fully pin-to-pin, software

and feature compatible. Besides the full compatibility within the STM8L family, the devices

are part of STMicroelectronics microcontrollers ultra low power strategy which also includes

STM8L101xx and STM32L15xxx. The STM8L and STM32L families allow a continuum of

performance, peripherals, system architecture, and features.

They are all based on STMicroelectronics 0.13 µm ultra-low leakage process.

Note: 1 The STM8L05xxx is pin-to-pin compatible with STM8L101xx devices.

2 The STM32L family is pin-to-pin compatible with the general purpose STM32F family.

Please refer to STM32L15x documentation for more information on these devices.

Performance

All families incorporate highly energy-efficient cores with both Harvard architecture and

pipelined execution: advanced STM8 core for STM8L families and ARM Cortex™-M3 core

for STM32L family. In addition specific care for the design architecture has been taken to

optimize the mA/DMIPS and mA/MHz ratios.

This allows the ultra low power performance to range from 5 up to 33.3 DMIPs.

Shared peripherals

STM8L05x, STM8L15x and STM32L15xx share identical peripherals which ensure a very

easy migration from one family to another:

●Analog peripheral: ADC1

●Digital peripherals: RTC and some communication interfaces

Common system strategy

To offer flexibility and optimize performance, the STM8L and STM32L devices use a

common architecture:

●Same power supply range from 1.8 to 3.6 V

●Architecture optimized to reach ultra-low consumption both in low power modes and

Run mode

●Fast startup strategy from low power modes

●Flexible system clock

●Ultra-safe reset: same reset strategy for both STM8L and STM32L including power-on

reset, power-down reset, brownout reset and programmable voltage detector

Features

ST ultra low power continuum also lies in feature compatibility:

●More than 10 packages with pin count from 20 to 100 pins and size down to 3 x 3 mm

●Memory density ranging from 4 to 128 Kbytes

Functional overview STM8L052R8

12/109 Doc ID023337 Rev 2

3 Functional overview

Figure 1. High density value line STM8L05xxx device block diagram

1. Legend:

ADC: Analog-to-digital converter

BOR: Brownout reset

DMA: Direct memory access

I²C: Inter-integrated circuit multimaster interface

LCD: Liquid crystal display

POR/PDR: Power on reset / power down reset

RTC: Real-time clock

SPI: Serial peripheral interface

SWIM: Single wire interface module

USART: Universal synchronous asynchronous receiver transmitter

WWDG: Window watchdog

IWDG: independent watchdog

MS30323V1

Clock

controller

and CSS Clocks

Address, control and data buses

64-Kbyte

4-Kbyte RAM

to core and

peripherals

IWDG

(38 kHz clock)

Port A

Port B

Port C

Power

VOLT. REG.

LCD driver

WWDG

256 bytes

Port D

Port E

Beeper

RTC

Program memory

Data EEPROM

@VDD

VDD18 VDD

=1.8 V

VSS

SWIM

SCL, SDA,

SPI1_MOSI, SPI1_MISO,

SPI1_SCK, SPI1_NSS

USART1_RX, USART1_TX,

USART1_CK

ADC1_INx

VDDA, VSSA

SMB

@VDDA/VSSA

12-bit ADC1

VREF+

3.6 V

NRST

PA[7:0]

PB[7:0]

PC[7:0]

PD[7:0]

PE[7:0]

PF[7:0]

BEEP

ALARM, CALIB,

TAMP1/2/3

SEGx, COMx

POR/PDR

OSC_IN,

OSC_OUT

OSC32_IN,

OSC32_OUT

BOR

PVD PVD_IN

RESET

DMA1 (4 channels)

3 channels

2 channels

VLCD = 2.5 to 3.6 V LCD booster

Internal reference

voltage

VREFINT out

IR_TIM

1-16 MHz oscillator

16 MHz internal RC

32 kHz oscillator

STM8 Core

16-bit Timer 1

16-bit Timer 2

38 kHz internal RC

Interrupt controller

16-bit Timer 3

Debug module

(SWIM)

8-bit Timer 4

Infrared interface

SPI1

I²C1

USART1

VREF-

Port F

16-bit Timer 5

2 channels

SPI2

SPI2_MOSI, SPI2_MISO,

SPI2_SCK, SPI2_NSS

USART2_RX, USART2_TX,

USART2_CK USART2

USART3_RX, USART3_TX,

USART3_CK USART3 PG[7:0]

Port G

YPSY

up to

STM8L052R8 Functional overview

Doc ID023337 Rev 2 13/109

3.1 Low power modes

The high density value line STM8L05xxx devices support five low power modes to achieve

the best compromise between low power consumption, short startup time and available

wakeup sources:

●Wait mode: The CPU clock is stopped, but selected peripherals keep running. An

internal or external interrupt, event or a Reset can be used to exit the microcontroller

from Wait mode (WFE or WFI mode).

●Low power run mode: The CPU and the selected peripherals are running. Execution

is done from RAM with a low speed oscillator (LSI or LSE). Flash memory and data

EEPROM are stopped and the voltage regulator is configured in ultra low power mode.

The microcontroller enters Low power run mode by software and can exit from this

mode by software or by a reset.

All interrupts must be masked. They cannot be used to exit the microcontroller from this

mode.

●Low power wait mode: This mode is entered when executing a Wait for event in Low

power run mode. It is similar to Low power run mode except that the CPU clock is

stopped. The wakeup from this mode is triggered by a Reset or by an internal or

external event (peripheral event generated by the timers, serial interfaces, DMA

controller (DMA1) and I/O ports). When the wakeup is triggered by an event, the

system goes back to Low power run mode.

All interrupts must be masked. They cannot be used to exit the microcontroller from this

mode.

●Active-halt mode: CPU and peripheral clocks are stopped, except RTC. The wakeup

can be triggered by RTC interrupts, external interrupts or reset.

●Halt mode: CPU and peripheral clocks are stopped, the device remains powered on.

The wakeup is triggered by an external interrupt or reset. A few peripherals have also a

wakeup from Halt capability. Switching off the internal reference voltage reduces power

consumption. Through software configuration it is also possible to wake up the device

without waiting for the internal reference voltage wakeup time to have a fast wakeup

time of 5 µs.

Functional overview STM8L052R8

14/109 Doc ID023337 Rev 2

3.2 Central processing unit STM8

3.2.1 Advanced STM8 Core

The 8-bit STM8 core is designed for code efficiency and performance with an Harvard

architecture and a 3-stage pipeline.

It contains 6 internal registers which are directly addressable in each execution context, 20

addressing modes including indexed indirect and relative addressing, and 80 instructions.

Architecture and registers

●Harvard architecture

●3-stage pipeline

●32-bit wide program memory bus - single cycle fetching most instructions

●X and Y 16-bit index registers - enabling indexed addressing modes with or without

offset and read-modify-write type data manipulations

●8-bit accumulator

●24-bit program counter - 16-Mbyte linear memory space

●16-bit stack pointer - access to a 64-Kbyte level stack

●8-bit condition code register - 7 condition flags for the result of the last instruction

Addressing

●20 addressing modes

●Indexed indirect addressing mode for lookup tables located anywhere in the address

space

●Stack pointer relative addressing mode for local variables and parameter passing

Instruction set

●80 instructions with 2-byte average instruction size

●Standard data movement and logic/arithmetic functions

●8-bit by 8-bit multiplication

●16-bit by 8-bit and 16-bit by 16-bit division

●Bit manipulation

●Data transfer between stack and accumulator (push/pop) with direct stack access

●Data transfer using the X and Y registers or direct memory-to-memory transfers

3.2.2 Interrupt controller

The high density value line STM8L05xxx devices feature a nested vectored interrupt

controller:

●Nested interrupts with 3 software priority levels

●32 interrupt vectors with hardware priority

●Up to 40 external interrupt sources on 11 vectors

●Trap and reset interrupts

STM8L052R8 Functional overview

Doc ID023337 Rev 2 15/109

3.3 Reset and supply management

3.3.1 Power supply scheme

The device requires a 1.8 V to 3.6 V operating supply voltage (VDD). The external power

supply pins must be connected as follows:

●VSS1, VDD1, VSS2, VDD2, VSS3, VDD3 = 1.8 to 3.6 V: external power supply for I/Os and

for the internal regulator. Provided externally through VDD pins, the corresponding

ground pin is VSS. VSS1/VSS2/VSS3/VSS4 and VDD1/VDD2/VDD3 must not be left

unconnected.

●VSSA ; VDDA = 1.8 to 3.6 V: external power supplies for analog peripherals. VDDA and

VSSA must be connected to VDD and VSS, respectively.

●VREF+ ; VREF- (for ADC1): external reference voltage for ADC1. Must be provided

externally through VREF+ and VREF- pin.

3.3.2 Power supply supervisor

The device has an integrated ZEROPOWER power-on reset (POR)/power-down reset

(PDR), coupled with a brownout reset (BOR) circuitry that ensures proper operation starting

from 1.8 V. After the 1.8 V BOR threshold is reached, the option byte loading process starts,

either to confirm or modify default thresholds, or to disable BOR permanently.

Five BOR thresholds are available through option bytes, starting from 1.8 V to 3 V. To

reduce the power consumption in Halt mode, it is possible to automatically switch off the

internal reference voltage (and consequently the BOR) in Halt mode. The device remains

under reset when VDD is below a specified threshold, VPOR/PDR or VBOR, without the need

for any external reset circuit.

The device features an embedded programmable voltage detector (PVD) that monitors the

VDD/VDDA power supply and compares it to the VPVD threshold. This PVD offers 7 different

levels between 1.85 V and 3.05 V, chosen by software, with a step around 200 mV. An

interrupt can be generated when VDD/VDDA drops below the VPVD threshold and/or when

VDD/VDDA is higher than the VPVD threshold. The interrupt service routine can then generate

a warning message and/or put the MCU into a safe state. The PVD is enabled by software.

3.3.3 Voltage regulator

The high density value line STM8L05xxx embeds an internal voltage regulator for

generating the 1.8 V power supply for the core and peripherals.

This regulator has two different modes:

●Main voltage regulator mode (MVR) for Run, Wait for interrupt (WFI) and Wait for event

(WFE) modes

●Low power voltage regulator mode (LPVR) for Halt, Active-halt, Low power run and Low

power wait modes

When entering Halt or Active-halt modes, the system automatically switches from the MVR

to the LPVR in order to reduce current consumption.

Functional overview STM8L052R8

16/109 Doc ID023337 Rev 2

3.4 Clock management

The clock controller distributes the system clock (SYSCLK) coming from different oscillators

to the core and the peripherals. It also manages clock gating for low power modes and

ensures clock robustness.

Features

●Clock prescaler: To get the best compromise between speed and current

consumption the clock frequency to the CPU and peripherals can be adjusted by a

programmable prescaler.

●Safe clock switching: Clock sources can be changed safely on the fly in run mode

through a configuration register.

●Clock management: To reduce power consumption, the clock controller can stop the

clock to the core, individual peripherals or memory.

●System clock sources: 4 different clock sources can be used to drive the system

clock:

– 1-16 MHz High speed external crystal (HSE)

– 16 MHz High speed internal RC oscillator (HSI)

– 32.768 kHz Low speed external crystal (LSE)

– 38 kHz Low speed internal RC (LSI)

●RTC and LCD clock sources: The above four sources can be chosen to clock the

RTC and the LCD, whatever the system clock.

●Startup clock: After reset, the microcontroller restarts by default with an internal

2 MHz clock (HSI/8). The prescaler ratio and clock source can be changed by the

application program as soon as the code execution starts.

●Clock security system (CSS): This feature can be enabled by software. If a HSE clock

failure occurs, the system clock is automatically switched to HSI.

●Configurable main clock output (CCO): This outputs an external clock for use by the

application.

STM8L052R8 Functional overview

Doc ID023337 Rev 2 17/109

Figure 2. High density value line STM8L05xxx clock tree diagram

1. The HSE clock source can be either an external crystal/ceramic resonator or an external source (HSE

bypass). Refer to Section HSE clock in the STM8L15x and STM8L16x reference manual (RM0031).

2. The LSE clock source can be either an external crystal/ceramic resonator or a external source (LSE

bypass). Refer to Section LSE clock in the STM8L15x and STM8L16x reference manual (RM0031).

3.5 Low power real-time clock

The real-time clock (RTC) is an independent binary coded decimal (BCD) timer/counter.

Six byte locations contain the second, minute, hour (12/24 hour), week day, date, month,

year, in BCD (binary coded decimal) format. Correction for 28, 29 (leap year), 30, and 31

day months are made automatically.The subsecond field can also be read in binary format.

The calendar can be corrected from 1 to 32767 RTC clock pulses. This allows to make a

synchronization to a master clock.

The RTC offers a digital calibration which allows an accuracy of +/-0.5ppm.

It provides a programmable alarm and programmable periodic interrupts with wakeup from

Halt capability.

●Periodic wakeup time using the 32.768 kHz LSE with the lowest resolution (of 61 µs) is

from min. 122 µs to max. 3.9 s. With a different resolution, the wakeup time can reach

36 hours.

●Periodic alarms based on the calendar can also be generated from every second to

every year.

A clock security system detects a failure on LSE, and can provide an interrupt with wakeup

capability. The RTC clock can automatically switch to LSI in case of LSE failure.

The RTC also provides 3 anti-tamper detection pins. This detection embeds a

programmable filter and can wakeup the MCU.

HSE OSC

1-16 MHz

HSI RC

16 MHz

LSI RC

38 k Hz

LSE OSC

32 768 kHz

HSI

LSI

RTC

prescaler

/1;2;4;8;16;32;64

PCLK

to peripherals

RTCCLK/2 to LCD

to IWDG

SYSCLK

HSE

LSI

LSE

OSC_OUT

OSC32_OUT

OSC_IN

OSC32_IN

clock output CCO

prescaler

/1;2;4;8;16;32;64

HSI

LSI

HSE

LSE

CCO

to core and

memory

SYSCLK

Prescaler

/1;2;4;8;16;32;64;128

IWDGCLK

RTCSEL[3:0]

LSE

CLKBEEPSEL[1:0]

to BEEP

BEEPCLK

MS30324V1

CSS

configurable

/ 2

Peripheral

Clock enable (20 bits)

to RTC

RTCCLK

clock enable (1 bit)

LCDCLK to LCD

SYSCLK

Halt

clock enable (1 bit)

LCD peripheral

RTCCLK

LCD peripheral

CSS_LSE

Functional overview STM8L052R8

18/109 Doc ID023337 Rev 2

3.6 LCD (Liquid crystal display)

The LCD is only available on STM8L052xx devices.

The liquid crystal display drives up to 8 common terminals and up to 24 segment terminals

to drive up to 192 pixels. It can also be configured to drive up to 4 common and 28 segments

(up to 112 pixels).

●Internal step-up converter to guarantee contrast control whatever VDD.

●Static 1/2, 1/3, 1/4, 1/8 duty supported.

●Static 1/2, 1/3, 1/4 bias supported.

●Phase inversion to reduce power consumption and EMI.

●Up to 8 pixels which can be programmed to blink.

●The LCD controller can operate in Halt mode.

Note: Unnecessary segments and common pins can be used as general I/O pins.

3.7 Memories

The high density value line STM8L05xxx devices have the following main features:

●4 Kbytes of RAM

●The non-volatile memory is divided into three arrays:

– 64 Kbytes of high density embedded Flash program memory

– 256 bytes of data EEPROM

–Option bytes

The EEPROM embeds the error correction code (ECC) feature. It supports the read-while-

write (RWW): it is possible to execute the code from the program matrix while

programming/erasing the data matrix.

The option byte protects part of the Flash program memory from write and readout piracy.

3.8 DMA

A 4-channel direct memory access controller (DMA1) offers a memory-to-memory and

peripherals-from/to-memory transfer capability. The 4 channels are shared between the

following IPs with DMA capability: ADC1, I2C1, SPI1, SPI 2, USART1, USART2, USART3

and the five timers.

STM8L052R8 Functional overview

Doc ID023337 Rev 2 19/109

3.9 Analog-to-digital converter

●12-bit analog-to-digital converter (ADC1) with 27 channels (including 4 fast channels)

and internal reference voltage

●Conversion time down to 1 µs with fSYSCLK= 16 MHz

●Programmable resolution

●Programmable sampling time

●Single and continuous mode of conversion

●Scan capability: automatic conversion performed on a selected group of analog inputs

●Analog watchdog: interrupt generation when the converted voltage is outside the

programmed threshold

●Triggered by timer

Note: ADC1 can be served by DMA1.

3.10 System configuration controller and routing interface

The system configuration controller provides the capability to remap some alternate

functions on different I/O ports. TIM4 and ADC1 DMA channels can also be remapped.

The highly flexible routing interface allows application software to control the routing of

different I/Os to the TIM1 timer input captures. It also controls the routing of internal analog

signals to ADC1 and the internal reference voltage VREFINT

3.11 Timers

The high density value line STM8L05xxx devices contain one advanced control timer

(TIM1), three 16-bit general purpose timers (TIM2, TIM3 and TIM5) and one 8-bit basic

timer (TIM4).

All the timers can be served by DMA1.

Ta bl e 2 compares the features of the advanced control, general-purpose and basic timers.

Table 2. Timer feature comparison

Timer Counter

resolution

Counter

type Prescaler factor

DMA1

request

generation

Capture/compare

channels

Complementary

outputs

TIM1

16-bit up/down

Any integer

from 1 to 65536

Ye s

3 + 1 3

TIM2

Any power of 2

from 1 to 128 2

None

TIM3

TIM5

TIM4 8-bit up Any power of 2

from 1 to 32768 0

Functional overview STM8L052R8

20/109 Doc ID023337 Rev 2

3.11.1 TIM1 - 16-bit advanced control timer

This is a high-end timer designed for a wide range of control applications. With its

complementary outputs, dead-time control and center-aligned PWM capability, the field of

applications is extended to motor control, lighting and half-bridge driver.

●16-bit up, down and up/down autoreload counter with 16-bit prescaler

●3 independent capture/compare channels (CAPCOM) configurable as input capture,

output compare, PWM generation (edge and center aligned mode) and single pulse

mode output

●1 additional capture/compare channel which is not connected to an external I/O

●Synchronization module to control the timer with external signals

●Break input to force timer outputs into a defined state

●3 complementary outputs with adjustable dead time

●Encoder mode

●Interrupt capability on various events (capture, compare, overflow, break, trigger)

3.11.2 16-bit general purpose timers

●16-bit autoreload (AR) up/down-counter

●7-bit prescaler adjustable to fixed power of 2 ratios (1…128)

●2 individually configurable capture/compare channels

●PWM mode

●Interrupt capability on various events (capture, compare, overflow, break, trigger)

●Synchronization with other timers or external signals (external clock, reset, trigger and

enable)

3.11.3 8-bit basic timer

The 8-bit timer consists of an 8-bit up auto-reload counter driven by a programmable

prescaler. It can be used for timebase generation with interrupt generation on timer overflow.

3.12 Watchdog timers

The watchdog system is based on two independent timers providing maximum security to

the applications.

3.12.1 Window watchdog timer

The window watchdog (WWDG) is used to detect the occurrence of a software fault, usually

generated by external interferences or by unexpected logical conditions, which cause the

application program to abandon its normal sequence.

3.12.2 Independent watchdog timer

The independent watchdog peripheral (IWDG) can be used to resolve processor

malfunctions due to hardware or software failures.

It is clocked by the internal LSI RC clock source, and thus stays active even in case of a

CPU clock failure.

STM8L052R8 Functional overview

Doc ID023337 Rev 2 21/109

3.13 Beeper

The beeper function outputs a signal on the BEEP pin for sound generation. The signal is in

the range of 1, 2 or 4 kHz.

3.14 Communication interfaces

3.14.1 SPI

The serial peripheral interfaces (SPI1 and SPI2) provide half/ full duplex synchronous serial

communication with external devices.

●Maximum speed: 8 Mbit/s (fSYSCLK/2) both for master and slave

●Full duplex synchronous transfers

●Simplex synchronous transfers on 2 lines with a possible bidirectional data line

●Master or slave operation - selectable by hardware or software

●Hardware CRC calculation

●Slave/master selection input pin

Note: SPI1 and SPI2 can be served by the DMA1 Controller.

3.14.2 I²C

The I2C bus interface (I2C1) provides multi-master capability, and controls all I²C bus-

specific sequencing, protocol, arbitration and timing.

●Master, slave and multi-master capability

●Standard mode up to 100 kHz and fast speed modes up to 400 kHz

●7-bit and 10-bit addressing modes

●SMBus 2.0 and PMBus support

●Hardware CRC calculation

Note: I2C1 can be served by the DMA1 Controller.

3.14.3 USART

The USART interfaces (USART1, USART2 and USART3) allow full duplex, asynchronous

communications with external devices requiring an industry standard NRZ asynchronous

serial data format. It offers a very wide range of baud rates.

●1 Mbit/s full duplex SCI

●SPI1 emulation

●High precision baud rate generator

●Smartcard emulation

●IrDA SIR encoder decoder

●Single wire half duplex mode

Note: USART1, USART2 and USART3 can be served by the DMA1 Controller.

Functional overview STM8L052R8

22/109 Doc ID023337 Rev 2

3.15 Infrared (IR) interface

The high density value line STM8L05xxx devices contain an infrared interface which can be

used with an IR LED for remote control functions. Two timer output compare channels are

used to generate the infrared remote control signals.

3.16 Development support

Development tools

Development tools for the STM8 microcontrollers include:

●The STice emulation system offering tracing and code profiling

●The STVD high-level language debugger including C compiler, assembler and

integrated development environment

●The STVP Flash programming software

The STM8 also comes with starter kits, evaluation boards and low-cost in-circuit

debugging/programming tools.

Single wire data interface (SWIM) and debug module

The debug module with its single wire data interface (SWIM) permits non-intrusive real-time

in-circuit debugging and fast memory programming.

The Single wire interface is used for direct access to the debugging module and memory

programming. The interface can be activated in all device operation modes.

The non-intrusive debugging module features a performance close to a full-featured

emulator. Beside memory and peripherals, CPU operation can also be monitored in real-

time by means of shadow registers.

Bootloader

A bootloader is available to reprogram the Flash memory using the USART1, USART2,

USART3 (USARTs in asynchronous mode), SPI1 or SPI2 interfaces. The reference

document for the bootloader is UM0560: STM8 bootloader user manual.

The bootloader is used to download application software into the device memories,

including RAM, program and data memory, using standard serial interfaces. It is a

complementary solution to programming via the SWIM debugging interface.

STM8L052R8 Pin description

Doc ID023337 Rev 2 23/109

4 Pin description

Figure 3. STM8L052R8 64-pin LQFP64 package pinout

NRST/PA1

PA2

PA3

PA4

VLCD

PE0

PE1

PD1

PD2

PD3

PE3

PD0

PE5

PE4

VDD1

VDDA

VREF+

PE2

PB2

PC0

PC1

DD3

SS3

PC2

PC3

PC4

PC5

PC6

PC7

PE6

PE7

PB3

PB4

PB5

PB6

PB7

PF0

PD4

PD5

PD6

PD7

PA0

PA5

17 18

PA6

PA7

VSSA/VREF-

VSS1

PG1

PG0

PG2

PG3

PB1

PB0

PF1

PF4

PF5

PF6

PF7

PG4

PG5

PG6

PG7

VSS2

VDD2

5051525354555758596061626364 56 49

32 31 30 28 27 26 25 24 23 22 29

ai17835

Pin description STM8L052R8
24/109 Doc ID023337 Rev 2
Table 3. Legend/abbreviation for Tabl e 4
         
Type I= input, O = output, S = power supply
Level
FT Five-volt tolerant
TT 3.6 V tolerant
Output HS = high sink/source (20 mA)
Port and control 
configuration
Input float = floating, wpu = weak pull-up
Output T = true open drain, OD = open drain, PP = push pull
Reset state
Bold X (pin state after reset release). 
Unless otherwise specified, the pin state is the same during the reset phase (i.e. 
“under reset”) and after internal reset release (i.e. at reset state).
Table 4. High density value line STM8L05xxx pin description
Pin 
number
Pin name
Type
I/O level
Input Output
Main function
(after reset)
Default alternate function
LQFP64
floating
wpu
Ext. interrupt 
High sink/source
OD
PP
2 NRST/PA1(1) I/O X HS X X Reset PA 1
3
PA2/OSC_IN/
[USART1_TX](8)/
[SPI1_MISO] (8)
I/O X X X HS X X Port A2
HSE oscillator input / 
[USART1 transmit] / [SPI1 
master in- slave out] 
4PA3/OSC_OUT/[USART1_
RX](8)/[SPI1_MOSI](8) I/O X X X HS X X Port A3
HSE oscillator output / 
[USART1 receive]/ [SPI1 
master out/slave in]/
5
PA4/TIM2_BKIN/
[TIM2_ETR](8)/
LCD_COM0/ADC1_IN2
I/O FT(2) XXXHSXXPort A4
Timer 2 - break input 
/[Timer 2 - trigger]/ 
LCD COM 0 / ADC1 input 2
6
PA5/TIM3_BKIN/
[TIM3_ETR](8)/
LCD_COM1/ADC1_IN1
I/O FT(2) XXXHSXXPort A5
Timer 3 - break input 
/[Timer 3 - trigger]/
LCD_COM 1 / ADC1 input 
1
7PA 6 / [ADC1_TRIG]/
LCD_COM2/ADC1_IN0 I/O FT(2) XXXHSXXPort A6
[ADC1 - trigger] / 
LCD_COM2 /
ADC1 input 0
8PA7/LCD_SEG0(2)
/TIM5_CH1 I/O FT(2) XXXHSXXPort A7 LCD segment 0/ TIM5 
channel 1
31 PB0(3)/TIM2_CH1/ 
LCD_SEG10/ADC1_IN18 I/O FT(2) XXXHSXXPort B0 Timer 2 - channel 1 / LCD 
segment 10 / ADC1_IN18
32
PB1/TIM3_CH1/
LCD_SEG11/
ADC1_IN17
I/O FT(2) XXXHSXXPort B1 Timer 3 - channel 1 / LCD 
segment 11 / ADC1_IN17

STM8L052R8 Pin description
Doc ID023337 Rev 2 25/109
33
PB2/ TIM2_CH2/ 
LCD_SEG12/
ADC1_IN16
I/O FT(2) XXXHSXXPort B2 Timer 2 - channel 2 / LCD 
segment 12 / ADC1_IN16
34
PB3/TIM2_ETR/
LCD_SEG13/
ADC1_IN15
I/O FT(2) XXXHSXXPort B3 Timer 2 -  trigger / LCD 
segment 13 /ADC1_IN15
35
PB4(3)/[SPI1_NSS](8)/
LCD_SEG14/
ADC1_IN14
I/O FT(2) X(3) X(3) XHSX XPort B4
[SPI1 master/slave select] / 
LCD segment 14 / 
ADC1_IN14
36
PB5/[SPI1_SCK](8)/
LCD_SEG15/
ADC1_IN13
I/O FT(2) XXXHSXXPort B5 [SPI1 clock] / LCD segment 
15 / ADC1_IN13
37
PB6/[SPI1_MOSI](8)/
LCD_SEG16/
ADC1_IN12
I/O FT(2) XXXHSXXPort B6
[SPI1 master out/slave in]/
LCD segment 16 / 
ADC1_IN12
38
PB7/[SPI1_MISO](8)/
LCD_SEG17/
ADC1_IN11
I/O FT(2) XXXHSXXPort B7
[SPI1 master in- slave out] 
/LCD segment 17 / 
ADC1_IN11
53 PC0(2)/I2C1_SDA I/O FT(2) XXT
(4) Port C0 I2C1 data 
54 PC1(2)/I2C1_SCL I/O FT(2) XXT
(4) Port C1 I2C1 clock
57
PC2/USART1_RX/
LCD_SEG22/ADC1_IN6/
VREFINT
I/O FT(2) XXXHSXXPort C2
USART1 receive / 
LCD segment 22 / 
ADC1_IN6 /Internal voltage 
reference output
58
PC3/USART1_TX/
LCD_SEG23/
ADC1_IN5
I/O FT(2) XXXHSXXPort C3
USART1 transmit / 
LCD segment 23 / 
ADC1_IN5
59
PC4/USART1_CK/
I2C1_SMB/CCO/
ADC1_IN4
I/O FT(2) XXXHSXXPort C4
USART1 synchronous 
clock / I2C1_SMB / 
Configurable clock output /
ADC1_IN4
60
PC5/OSC32_IN 
/[SPI1_NSS](8)/
[USART1_TX](8)
I/O FT(2) XXXHSXXPort C5
LSE oscillator input / [SPI1 
master/slave select] / 
[USART1 transmit]
61
PC6/OSC32_OUT/
[SPI1_SCK](8)/
[USART1_RX](8)
I/O FT(2) XXXHSXXPort C6
LSE oscillator output / 
[SPI1 clock] / [USART1 
receive]
62 PC7/ADC1_IN3 I/O FT(2) XXXHSXXPort C7 ADC1_IN3
Table 4. High density value line STM8L05xxx pin description (continued)
Pin 
number
Pin name
Type
I/O level
Input Output
Main function
(after reset)
Default alternate function
LQFP64
floating
wpu
Ext. interrupt 
High sink/source
OD
PP

Pin description STM8L052R8
26/109 Doc ID023337 Rev 2
25
PD0/TIM3_CH2/
[ADC1_TRIG](8)/
LCD_SEG7/ADC1_IN22/
I/O FT(2) XXXHSXXPort D0
Timer 3 - channel 2 / 
[ADC1_Trigger] / LCD 
segment 7 / ADC1_IN22
26
PD1/TIM3_ETR/ 
LCD_COM3/
ADC1_IN21
I/O FT(2) XXXHSXXPort D1 Timer 3 - trigger / 
LCD_COM3 / ADC1_IN21
27
PD2/TIM1_CH1 
/LCD_SEG8/
ADC1_IN20
I/O FT(2) XXXHSXXPort D2 Timer 1 - channel 1 / LCD 
segment 8 / ADC1_IN20
28 PD3/ TIM1_ETR/ 
LCD_SEG9/ADC1_IN19 I/O FT(2) XXXHSXXPort D3 Timer 1 -  trigger / LCD 
segment 9 / ADC1_IN19
45
PD4/TIM1_CH2 
/LCD_SEG18/
ADC1_IN10
I/O FT(2) XXXHSXXPort D4 Timer 1 - channel 2 / LCD 
segment 18 / ADC1_IN10
46
PD5/TIM1_CH3 
/LCD_SEG19/
ADC1_IN9
I/O FT(2) XXXHSXXPort D5 Timer 1 - channel 3 / LCD 
segment 19 / ADC1_IN9
47
PD6/TIM1_BKIN 
/LCD_SEG20/
ADC1_IN8/RTC_CALIB/
/VREFINT
I/O FT(2) XXXHSXXPort D6
Timer 1 - break input / LCD 
segment 20 / ADC1_IN8 / 
RTC calibration / Internal 
voltage reference output 
48
PD7/TIM1_CH1N 
/LCD_SEG21/
ADC1_IN7/RTC_ALARM/V
REFINT
I/O FT(2) XXXHSXXPort D7
Timer 1 - inverted channel 
1/ LCD segment 21 / 
ADC1_IN7 / RTC alarm / 
Internal voltage reference 
output
49 PG4/SPI2_NSS I/O FT(2) XXXHSXXPort G4 SPI2 
master/slave select
50 PG5/SPI2_SCK I/O FT(2) XXXHSXXPort G5 SPI2 clock
51 PG6/SPI2_MOSI I/O FT(2) XXXHSXXPort G6 SPI2
master out- slave in
52 PG7/SPI2_MISO I/O FT(2) XXXHSXXPort G7 SPI2
master in- slave out
19 PE0(2)/LCD_SEG1/TIM5_C
H2/RTC_TAMP1 I/O FT(2) XXXHSXXPort E0 LCD segment 1/Timer 5 
channel 2/RTC tamper 1
20 PE1/TIM1_CH2N/ 
LCD_SEG2/RTC_TAMP2 I/O FT(2) XXXHSXXPort E1
Timer 1 - inverted channel 
2 / LCD segment 2/
RTC tamper 2
Table 4. High density value line STM8L05xxx pin description (continued)
Pin 
number
Pin name
Type
I/O level
Input Output
Main function
(after reset)
Default alternate function
LQFP64
floating
wpu
Ext. interrupt 
High sink/source
OD
PP

STM8L052R8 Pin description
Doc ID023337 Rev 2 27/109
21 PE2/TIM1_CH3N/ 
LCD_SEG3/RTC_TAMP3 I/O FT(2) XXXHSXXPort E2
Timer 1 - inverted channel 
3 / LCD segment 3/
RTC tamper 3
22 PE3/LCD_SEG4
/USART2_RX I/O FT(2) XXXHSXXPort E3 LCD segment 4
/USART2 receive
23 PE4/LCD_SEG5
/USART2_TX I/O FT(2) XXXHSXXPort E4 LCD segment 5
/USART2 transmit
24 PE5/LCD_SEG6/
ADC1_IN23/USART2_CK I/O FT(2) XXXHSXXPort E5
LCD segment 6 / 
ADC1_IN23/USART2
synchronous clock
63 PE6/PVD_IN/TIM5_BKIN I/O FT(2) XXXHSXXPort E6 PVD_IN
/TIM5 break input
64 PE7
/TIM5_ETR I/O FT(2) XXXHSXXPort E7 TIM5 trigger
39 PF0/ADC1_IN24
/[USART3_TX] I/O X X X HS X X Port F0 ADC1_IN24/
[USART3 transmit]
40 PF1/ADC1_IN25/
[USART3_RX] I/O XXXHSXXPort F1 ADC1_IN25/
[USART3 receive]
41 PF4/LCD_SEG36
/LCD_COM4(5) I/O FT(2) XXXHSXXPort F4 LCD_SEG36/
LCD COM4(5)
42 PF5/LCD_SEG37/
LCD_COM5(5) I/O FT(2) XXXHSXXPort F5 LCD_SEG37/
LCD COM5(5)
43 PF6/LCD_SEG38/
LCD_COM6(5) I/O FT(2) XXXHSXXPort F6 LCD_SEG38/
LCD COM6(5)
44 PF7/LCD_SEG39/
LCD_COM7(5) I/O FT(2) XXXHSXXPort F7 LCD_SEG39/
LCD COM7(5)
18 VLCD S LCD booster external capacitor
11 VDD1 S Digital power supply
10 VSS1 I/O ground
12 VDDA S Analog supply voltage
13 VREF+ S ADC1 positive voltage reference
14 PG0/USART3_RX/
[TIM2_BKIN] I/O FT(2) XXXHSXXPort G0 USART3 receive /
[Timer 2 - break input]
15 PG1/USART3_TX/
[TIM3_BKIN] I/O FT(2) XXXHSXXPort G1 USART3 transmit /
[Timer 3 -break input]
Table 4. High density value line STM8L05xxx pin description (continued)
Pin 
number
Pin name
Type
I/O level
Input Output
Main function
(after reset)
Default alternate function
LQFP64
floating
wpu
Ext. interrupt 
High sink/source
OD
PP

Pin description STM8L052R8

28/109 Doc ID023337 Rev 2

16 PG2/USART3_CK I/O FT(2) XXXHSXXPort G2 USART 3 synchronous

clock

17 PG3[TIM3_ETR] I/O FT(2) XXXHSXXPort G3 [Timer 3 - trigger]

SSA/VREF- SAnalog ground voltage /

ADC1 negative voltage reference

55 VDD2 S IOs supply voltage

56 VSS2 S IOs ground voltage

1PA 0 (6)/[USART1_CK](8)/

SWIM/BEEP/IR_TIM (7) I/O X X X HS XXPort A0

[USART1 synchronous

clock](8) / SWIM input and

output /Beep output

/ Infrared Timer output

29 VDD3 S IOs supply voltage

30 VSS3 S IOs ground voltage

1. At power-up, the PA1/NRST pin is a reset input pin with pull-up. To be used as a general purpose pin (PA1), it can be

configured only as output open-drain or push-pull, not as a general purpose input. Refer to Section Configuring NRST/PA1

pin as general purpose output in the STM8L15x and STM8L16x reference manual (RM0031).

2. In the 5 V tolerant I/Os, protection diode to VDD is not implemented.

3. A pull-up is applied to PB0 and PB4 during the reset phase. These two pins are input floating after reset release.

4. In the open-drain output column, ‘T’ defines a true open-drain I/O (P-buffer, weak pull-up and protection diode to VDD are

not implemented).

5. SEG/COM multiplexing available on medium+ and high density devices. SEG signals are available by default (see

reference manual for details).

6. The PA0 pin is in input pull-up during the reset phase and after reset release.

7. High Sink LED driver capability available on PA0.

8. [ ] Alternate function remapping option (if the same alternate function is shown twice, it indicates an exclusive choice not a

duplication of the function).

Table 4. High density value line STM8L05xxx pin description (continued)

number

Pin name

Type

I/O level

Input Output

Main function

(after reset)

Default alternate function

LQFP64

floating

wpu

Ext. interrupt

High sink/source

STM8L052R8 Pin description

Doc ID023337 Rev 2 29/109

4.1 System configuration options

As shown in Table 4: High density value line STM8L05xxx pin description, some alternate

functions can be remapped on different I/O ports by programming one of the two remapping

registers described in the “Routing interface (RI) and system configuration controller”

section in the STM8L15x and STM8L16x reference manual (RM0031).

Memory and register map STM8L052R8

30/109 Doc ID023337 Rev 2

5 Memory and register map

5.1 Memory mapping

The memory map is shown in Figure 4.

Figure 4. Memory map

1. Table 5 lists the boundary addresses for each memory size. The top of the stack is at the RAM end

address.

2. Refer to Table 7 for an overview of hardware register mapping, to Table 6 for details on I/O port hardware

registers, and to Table 8 for information on CPU/SWIM/debug module controller registers.

GPIO and peripheral registers

0x00 0000

Reserved

High density

(64 Kbytes)

Reset and interrupt vectors

0x00 1000

0x00 10FF

0x00 07FF

RAM (4 Kbytes) (1)

(513 bytes) (1)

0x00 1100

Data EEPROM

0x00 4800

0x00 48FF

0x00 4900

0x00 7FFF

0x00 8000

0x00 FFFF

0x00 0800

0x00 0FFF

0x00 47FF

0x00 7EFF

0x00 8080

0x00 807F

0x00 7F00

Reserved

including

Stack

(256 bytes)

Option bytes

0x00 4FFF

0x00 5000

0x00 57FF

0x00 5800

Reserved

0x00 5FFF

Boot ROM

0x00 6000

0x00 67FF (2 Kbytes)

0x00 6800

Reserved

CPU/SWIM/Debug/ITC

Registers

0x00 5000 GPIO Ports

0x00 5050 Flash

0x00 50C0

ITC-EXTI

0x00 50D3

RST

0x00 50E0

CLK

0x00 50F0

WWDG

0x00 5210

IWDG

0x00 5230

BEEP

0x00 5250

RTC

0x00 5280

SPI1

0x00 52E0

I2C1

0x00 52FF

USART1

TIM2

TIM3

TIM1

TIM4

IRTIM

ADC1

0x00 5070 DMA1

SYSCFG

SPI2

USART2

0x00 509D

0x00 50A0

0x00 50B0

0x00 5140

0x00 5200

0x00 5300

0x00 5340

0x00 5380

0x00 53F0

0x00 5430

0x00 5440

Flash program memory

WFE

0x00 50A6

0x00 50B2 PWR

Reserved

0x00 53C0

Reserved

LCD

USART3

0x00 53E0

0x00 5400

0x00 5444

TIM5

0x00 52B0

STM8L052R8 Memory and register map

Doc ID023337 Rev 2 31/109

5.2 Register map

Table 5. Flash and RAM boundary addresses

Memory area Size Start address End address

RAM 4 Kbytes 0x00 0000 0x00 0FFF

Flash program memory 64 Kbytes 0x00 8000 0x01 7FFF

Table 6. I/O port hardware register map

Address Block Register label Register name Reset

status

0x00 5000

Port A

PA_ODR Port A data output latch register 0x00

0x00 5001 PA_IDR Port A input pin value register 0xXX

0x00 5002 PA_DDR Port A data direction register 0x00

0x00 5003 PA_CR1 Port A control register 1 0x01

0x00 5004 PA_CR2 Port A control register 2 0x00

0x00 5005

Port B

PB_ODR Port B data output latch register 0x00

0x00 5006 PB_IDR Port B input pin value register 0xXX

0x00 5007 PB_DDR Port B data direction register 0x00

0x00 5008 PB_CR1 Port B control register 1 0x00

0x00 5009 PB_CR2 Port B control register 2 0x00

0x00 500A

Port C

PC_ODR Port C data output latch register 0x00

0x00 500B PC_IDR Port C input pin value register 0xXX

0x00 500C PC_DDR Port C data direction register 0x00

0x00 500D PC_CR1 Port C control register 1 0x00

0x00 500E PC_CR2 Port C control register 2 0x00

0x00 500F

Port D

PD_ODR Port D data output latch register 0x00

0x00 5010 PD_IDR Port D input pin value register 0xXX

0x00 5011 PD_DDR Port D data direction register 0x00

0x00 5012 PD_CR1 Port D control register 1 0x00

0x00 5013 PD_CR2 Port D control register 2 0x00

0x00 5014

Port E

PE_ODR Port E data output latch register 0x00

0x00 5015 PE_IDR Port E input pin value register 0xXX

0x00 5016 PE_DDR Port E data direction register 0x00

0x00 5017 PE_CR1 Port E control register 1 0x00

0x00 5018 PE_CR2 Port E control register 2 0x00

Memory and register map STM8L052R8

32/109 Doc ID023337 Rev 2

0x00 5019

Port F

PF_ODR Port F data output latch register 0x00

0x00 501A PF_IDR Port F input pin value register 0xXX

0x00 501B PF_DDR Port F data direction register 0x00

0x00 501C PF_CR1 Port F control register 1 0x00

0x00 501D PF_CR2 Port F control register 2 0x00

0x00 501E

Port G

PG_ODR Port F data output latch register 0x00

0x00 501F PG_IDR Port G input pin value register 0xXX

0x00 5020 PG_DDR Port G data direction register 0x00

0x00 5021 PG_CR1 Port G control register 1 0x00

0x00 5022 PG_CR2 Port G control register 2 0x00

0x00 5023 to

0x00 502C Reserved area (10 bytes)

Table 6. I/O port hardware register map (continued)

Address Block Register label Register name Reset

status

Table 7. General hardware register map

Address Block Register label Register name Reset

status

0x00 502E to

0x00 5049 Reserved area (27 bytes)

0x00 5050

Flash

FLASH_CR1 Flash control register 1 0x00

0x00 5051 FLASH_CR2 Flash control register 2 0x00

0x00 5052 FLASH _PUKR Flash program memory unprotection key

0x00 5053 FLASH _DUKR Data EEPROM unprotection key register 0x00

0x00 5054 FLASH _IAPSR Flash in-application programming status

0x00 5055 to

0x00 506F Reserved area (27 bytes)

STM8L052R8 Memory and register map

Doc ID023337 Rev 2 33/109

0x00 5070

DMA1

DMA1_GCSR DMA1 global configuration & status

0x00 5071 DMA1_GIR1 DMA1 global interrupt register 1 0x00

0x00 5072 to

0x00 5074 Reserved area (3 bytes)

0x00 5075 DMA1_C0CR DMA1 channel 0 configuration register 0x00

0x00 5076 DMA1_C0SPR DMA1 channel 0 status & priority register 0x00

0x00 5077 DMA1_C0NDTR DMA1 number of data to transfer register

(channel 0) 0x00

0x00 5078 DMA1_C0PARH DMA1 peripheral address high register

(channel 0) 0x52

0x00 5079 DMA1_C0PARL DMA1 peripheral address low register

(channel 0) 0x00

0x00 507A Reserved area (1 byte)

0x00 507B DMA1_C0M0ARH DMA1 memory 0 address high register

(channel 0) 0x00

0x00 507C DMA1_C0M0ARL DMA1 memory 0 address low register

(channel 0) 0x00

0x00 507D

0x00 507E Reserved area (2 bytes)

0x00 507F DMA1_C1CR DMA1 channel 1 configuration register 0x00

0x00 5080 DMA1_C1SPR DMA1 channel 1 status & priority register 0x00

0x00 5081 DMA1_C1NDTR DMA1 number of data to transfer register

(channel 1) 0x00

0x00 5082 DMA1_C1PARH DMA1 peripheral address high register

(channel 1) 0x52

0x00 5083 DMA1_C1PARL DMA1 peripheral address low register

(channel 1) 0x00

Table 7. General hardware register map (continued)

Address Block Register label Register name Reset

status

Memory and register map STM8L052R8

34/109 Doc ID023337 Rev 2

0x00 5084

DMA1

Reserved area (1 byte)

0x00 5085 DMA1_C1M0ARH DMA1 memory 0 address high register

(channel 1) 0x00

0x00 5086 DMA1_C1M0ARL DMA1 memory 0 address low register

(channel 1) 0x00

0x00 5087

0x00 5088 Reserved area (2 bytes)

0x00 5089 DMA1_C2CR DMA1 channel 2 configuration register 0x00

0x00 508A DMA1_C2SPR DMA1 channel 2 status & priority register 0x00

0x00 508B DMA1_C2NDTR DMA1 number of data to transfer register

(channel 2) 0x00

0x00 508C DMA1_C2PARH DMA1 peripheral address high register

(channel 2) 0x52

0x00 508D DMA1_C2PARL DMA1 peripheral address low register

(channel 2) 0x00

0x00 508E Reserved area (1 byte)

0x00 508F DMA1_C2M0ARH DMA1 memory 0 address high register

(channel 2) 0x00

0x00 5090 DMA1_C2M0ARL DMA1 memory 0 address low register

(channel 2) 0x00

0x00 5091

0x00 5092 Reserved area (2 bytes)

0x00 5093 DMA1_C3CR DMA1 channel 3 configuration register 0x00

0x00 5094 DMA1_C3SPR DMA1 channel 3 status & priority register 0x00

0x00 5095 DMA1_C3NDTR DMA1 number of data to transfer register

(channel 3) 0x00

0x00 5096 DMA1_C3PARH_

C3M1ARH

DMA1 peripheral address high register

(channel 3) 0x40

0x00 5097 DMA1_C3PARL_

C3M1ARL

DMA1 peripheral address low register

(channel 3) 0x00

0x00 5098 Reserved area (1 byte)

0x00 5099 DMA1_C3M0ARH DMA1 memory 0 address high register

(channel 3) 0x00

0x00 509A DMA1_C3M0ARL DMA1 memory 0 address low register

(channel 3) 0x00

0x00 509B to

0x00 509C Reserved area (2 bytes)

Table 7. General hardware register map (continued)

Address Block Register label Register name Reset

status

STM8L052R8 Memory and register map

Doc ID023337 Rev 2 35/109

0x00 509D

SYSCFG

SYSCFG_RMPCR3 Remapping register 3 0x00

0x00 509E SYSCFG_RMPCR1 Remapping register 1 0x00

0x00 509F SYSCFG_RMPCR2 Remapping register 2 0x00

0x00 50A0

ITC - EXTI

EXTI_CR1 External interrupt control register 1 0x00

0x00 50A1 EXTI_CR2 External interrupt control register 2 0x00

0x00 50A2 EXTI_CR3 External interrupt control register 3 0x00

0x00 50A3 EXTI_SR1 External interrupt status register 1 0x00

0x00 50A4 EXTI_SR2 External interrupt status register 2 0x00

0x00 50A5 EXTI_CONF1 External interrupt port select register 1 0x00

0x00 50A6

WFE

WFE_CR1 WFE control register 1 0x00

0x00 50A7 WFE_CR2 WFE control register 2 0x00

0x00 50A8 WFE_CR3 WFE control register 3 0x00

0x00 50A9 WFE_CR4 WFE control register 4 0x00

0x00 50AA ITC - EXTI EXTI_CR4 External interrupt control register 4 0x00

0x00 50AB EXTI_CONF2 External interrupt port select register 2 0x00

0x00 50A9 to

0x00 50AF Reserved area (7 bytes)

0x00 50B0 RST RST_CR Reset control register 0x00

0x00 50B1 RST_SR Reset status register 0x01

0x00 50B2 PWR PWR_CSR1 Power control and status register 1 0x00

0x00 50B3 PWR_CSR2 Power control and status register 2 0x00

0x00 50B4 to

0x00 50BF Reserved area (12 bytes)

Table 7. General hardware register map (continued)

Address Block Register label Register name Reset

status

Memory and register map STM8L052R8

36/109 Doc ID023337 Rev 2

0x00 50C0

CLK

CLK_CKDIVR Clock master divider register 0x03

0x00 50C1 CLK_CRTCR Clock RTC register 0x00(1)

0x00 50C2 CLK_ICKR Internal clock control register 0x11

0x00 50C3 CLK_PCKENR1 Peripheral clock gating register 1 0x00

0x00 50C4 CLK_PCKENR2 Peripheral clock gating register 2 0x00

0x00 50C5 CLK_CCOR Configurable clock control register 0x00

0x00 50C6 CLK_ECKR External clock control register 0x00

0x00 50C7 CLK_SCSR System clock status register 0x01

0x00 50C8 CLK_SWR System clock switch register 0x01

0x00 50C9 CLK_SWCR Clock switch control register 0xX0

0x00 50CA CLK_CSSR Clock security system register 0x00

0x00 50CB CLK_CBEEPR Clock BEEP register 0x00

0x00 50CC CLK_HSICALR HSI calibration register 0xXX

0x00 50CD CLK_HSITRIMR HSI clock calibration trimming register 0x00

0x00 50CE CLK_HSIUNLCKR HSI unlock register 0x00

0x00 50CF CLK_REGCSR Main regulator control status register 0bxx11100x

0x00 50D0 CLK_PCKENR3 Peripheral clock gating register 3 0x00

0x00 50D1 to

0x00 50D2 Reserved area (2 bytes)

0x00 50D3 WWDG WWDG_CR WWDG control register 0x7F

0x00 50D4 WWDG_WR WWDR window register 0x7F

0x00 50D5 to

00 50DF Reserved area (11 bytes)

0x00 50E0

IWDG

IWDG_KR IWDG key register 0xXX

0x00 50E1 IWDG_PR IWDG prescaler register 0x00

0x00 50E2 IWDG_RLR IWDG reload register 0xFF

0x00 50E3 to

0x00 50EF Reserved area (13 bytes)

0x00 50F0

BEEP

BEEP_CSR1 BEEP control/status register 1 0x00

0x00 50F1

0x00 50F2 Reserved area (2 bytes)

0x00 50F3 BEEP_CSR2 BEEP control/status register 2 0x1F

0x00 50F4 to

0x00 513F Reserved area (76 bytes)

Table 7. General hardware register map (continued)

Address Block Register label Register name Reset

status

STM8L052R8 Memory and register map
Doc ID023337 Rev 2 37/109
0x00 5140
RTC
RTC_TR1 Time register 1 0x00
0x00 5141 RTC_TR2 Time register 2 0x00
0x00 5142 RTC_TR3 Time register 3 0x00
0x00 5143 Reserved area (1 byte)
0x00 5144 RTC_DR1 Date register 1 0x01
0x00 5145 RTC_DR2 Date register 2 0x21
0x00 5146 RTC_DR3 Date register 3 0x00
0x00 5147 Reserved area (1 byte)
0x00 5148 RTC_CR1 Control register 1 0x00(1)
0x00 5149 RTC_CR2 Control register 2 0x00(1)
0x00 514A RTC_CR3 Control register 3 0x00(1)
0x00 514B Reserved area (1 byte)
0x00 514C RTC_ISR1 Initialization and status register 1 0x01
0x00 514D RTC_ISR2 Initialization and Status register 2 0x00
0x00 514E
0x00 514F Reserved area (2 bytes)
0x00 5150 RTC_SPRERH(1) Synchronous prescaler register high 0x00(1)
0x00 5151 RTC_SPRERL(1) Synchronous prescaler register low 0xFF(1)
0x00 5152 RTC_APRER(1) Asynchronous prescaler register 0x7F(1)
0x00 5153 Reserved area (1 byte)
0x00 5154 RTC_WUTRH(1) Wakeup timer register high 0xFF(1)
0x00 5155 RTC_WUTRL(1) Wakeup timer register low 0xFF(1)
0x00 5156 Reserved area (1 bytes)
0x00 5157 RTC_SSRL Subsecond register low 0x00
0x00 5158 RTC_SSRH Subsecond register high 0x00
0x00 5159 RTC_WPR Write protection register 0x00
0x00 515A RTC_SHIFTRH Shift register high 0x00
0x00 515B RTC_SHIFTRL Shift register low 0x00
0x00 515C RTC_ALRMAR1 Alarm A register 1 0x00(1)
0x00 515D RTC_ALRMAR2 Alarm A register 2 0x00(1)
0x00 515E RTC_ALRMAR3 Alarm A register 3 0x00(1)
0x00 515F RTC_ALRMAR4 Alarm A register 4 0x00(1)
0x00 5160 to
0x00 5163 Reserved area (4 bytes)
Table 7. General hardware register map (continued)
Address Block Register label Register name Reset 
status

Memory and register map STM8L052R8

38/109 Doc ID023337 Rev 2

0x00 5164

RTC

RTC_ALRMASSRH Alarm A subsecond register high 0x00(1)

0x00 5165 RTC_ALRMASSRL Alarm A subsecond register low 0x00(1)

0x00 5166 RTC_ALRMASSMS

KR Alarm A masking register 0x00(1)

0x00 5167 to

0x00 5169 Reserved area (3 bytes)

0x00 516A

RTC

RTC_CALRH Calibration register high 0x00(1)

0x00 516B RTC_CALRL Calibration register low 0x00(1)

0x00 516C RTC_TCR1 Tamper control register 1 0x00(1)

0x00 516D RTC_TCR2 Tamper control register 2 0x00(1)

0x00 516E to

0x00 518A Reserved area

0x00 5190 CSSLSE CSSLSE_CSR CSS on LSE control and status register 0x00(1)

0x00 519A to

0x00 51FF Reserved area

0x00 5200

SPI1

SPI1_CR1 SPI1 control register 1 0x00

0x00 5201 SPI1_CR2 SPI1 control register 2 0x00

0x00 5202 SPI1_ICR SPI1 interrupt control register 0x00

0x00 5203 SPI1_SR SPI1 status register 0x02

0x00 5204 SPI1_DR SPI1 data register 0x00

0x00 5205 SPI1_CRCPR SPI1 CRC polynomial register 0x07

0x00 5206 SPI1_RXCRCR SPI1 Rx CRC register 0x00

0x00 5207 SPI1_TXCRCR SPI1 Tx CRC register 0x00

0x00 5208 to

0x00 520F Reserved area (8 bytes)

Table 7. General hardware register map (continued)

Address Block Register label Register name Reset

status

STM8L052R8 Memory and register map

Doc ID023337 Rev 2 39/109

0x00 5210

I2C1

I2C1_CR1 I2C1 control register 1 0x00

0x00 5211 I2C1_CR2 I2C1 control register 2 0x00

0x00 5212 I2C1_FREQR I2C1 frequency register 0x00

0x00 5213 I2C1_OARL I2C1 own address register low 0x00

0x00 5214 I2C1_OARH I2C1 own address register high 0x00

0x00 5215 I2C1_OARH I2C1 own address register for dual mode 0x00

0x00 5216 I2C1_DR I2C1 data register 0x00

0x00 5217 I2C1_SR1 I2C1 status register 1 0x00

0x00 5218 I2C1_SR2 I2C1 status register 2 0x00

0x00 5219 I2C1_SR3 I2C1 status register 3 0x0x

0x00 521A I2C1_ITR I2C1 interrupt control register 0x00

0x00 521B I2C1_CCRL I2C1 clock control register low 0x00

0x00 521C I2C1_CCRH I2C1 clock control register high 0x00

0x00 521D I2C1_TRISER I2C1 TRISE register 0x02

0x00 521E I2C1_PECR I2C1 packet error checking register 0x00

0x00 521F to

0x00 522F Reserved area (17 bytes)

0x00 5230

USART1

USART1_SR USART1 status register 0xC0

0x00 5231 USART1_DR USART1 data register 0xXX

0x00 5232 USART1_BRR1 USART1 baud rate register 1 0x00

0x00 5233 USART1_BRR2 USART1 baud rate register 2 0x00

0x00 5234 USART1_CR1 USART1 control register 1 0x00

0x00 5235 USART1_CR2 USART1 control register 2 0x00

0x00 5236 USART1_CR3 USART1 control register 3 0x00

0x00 5237 USART1_CR4 USART1 control register 4 0x00

0x00 5238 USART1_CR5 USART1 control register 5 0x00

0x00 5239 USART1_GTR USART1 guard time register 0x00

0x00 523A USART1_PSCR USART1 prescaler register 0x00

0x00 523B to

0x00 524F Reserved area (21 bytes)

Table 7. General hardware register map (continued)

Address Block Register label Register name Reset

status

Memory and register map STM8L052R8

40/109 Doc ID023337 Rev 2

0x00 5250

TIM2

TIM2_CR1 TIM2 control register 1 0x00

0x00 5251 TIM2_CR2 TIM2 control register 2 0x00

0x00 5252 TIM2_SMCR TIM2 Slave mode control register 0x00

0x00 5253 TIM2_ETR TIM2 external trigger register 0x00

0x00 5254 TIM2_DER TIM2 DMA1 request enable register 0x00

0x00 5255 TIM2_IER TIM2 interrupt enable register 0x00

0x00 5256 TIM2_SR1 TIM2 status register 1 0x00

0x00 5257 TIM2_SR2 TIM2 status register 2 0x00

0x00 5258 TIM2_EGR TIM2 event generation register 0x00

0x00 5259 TIM2_CCMR1 TIM2 capture/compare mode register 1 0x00

0x00 525A TIM2_CCMR2 TIM2 capture/compare mode register 2 0x00

0x00 525B TIM2_CCER1 TIM2 capture/compare enable register 1 0x00

0x00 525C TIM2_CNTRH TIM2 counter high 0x00

0x00 525D TIM2_CNTRL TIM2 counter low 0x00

0x00 525E TIM2_PSCR TIM2 prescaler register 0x00

0x00 525F TIM2_ARRH TIM2 auto-reload register high 0xFF

0x00 5260 TIM2_ARRL TIM2 auto-reload register low 0xFF

0x00 5261 TIM2_CCR1H TIM2 capture/compare register 1 high 0x00

0x00 5262 TIM2_CCR1L TIM2 capture/compare register 1 low 0x00

0x00 5263 TIM2_CCR2H TIM2 capture/compare register 2 high 0x00

0x00 5264 TIM2_CCR2L TIM2 capture/compare register 2 low 0x00

0x00 5265 TIM2_BKR TIM2 break register 0x00

0x00 5266 TIM2_OISR TIM2 output idle state register 0x00

0x00 5267 to

0x00 527F Reserved area (25 bytes)

Table 7. General hardware register map (continued)

Address Block Register label Register name Reset

status

STM8L052R8 Memory and register map

Doc ID023337 Rev 2 41/109

0x00 5280

TIM3

TIM3_CR1 TIM3 control register 1 0x00

0x00 5281 TIM3_CR2 TIM3 control register 2 0x00

0x00 5282 TIM3_SMCR TIM3 Slave mode control register 0x00

0x00 5283 TIM3_ETR TIM3 external trigger register 0x00

0x00 5284 TIM3_DER TIM3 DMA1 request enable register 0x00

0x00 5285 TIM3_IER TIM3 interrupt enable register 0x00

0x00 5286 TIM3_SR1 TIM3 status register 1 0x00

0x00 5287 TIM3_SR2 TIM3 status register 2 0x00

0x00 5288 TIM3_EGR TIM3 event generation register 0x00

0x00 5289 TIM3_CCMR1 TIM3 Capture/Compare mode register 1 0x00

0x00 528A TIM3_CCMR2 TIM3 Capture/Compare mode register 2 0x00

0x00 528B TIM3_CCER1 TIM3 Capture/Compare enable register 1 0x00

0x00 528C TIM3_CNTRH TIM3 counter high 0x00

0x00 528D TIM3_CNTRL TIM3 counter low 0x00

0x00 528E TIM3_PSCR TIM3 prescaler register 0x00

0x00 528F TIM3_ARRH TIM3 Auto-reload register high 0xFF

0x00 5290 TIM3_ARRL TIM3 Auto-reload register low 0xFF

0x00 5291 TIM3_CCR1H TIM3 Capture/Compare register 1 high 0x00

0x00 5292 TIM3_CCR1L TIM3 Capture/Compare register 1 low 0x00

0x00 5293 TIM3_CCR2H TIM3 Capture/Compare register 2 high 0x00

0x00 5294 TIM3_CCR2L TIM3 Capture/Compare register 2 low 0x00

0x00 5295 TIM3_BKR TIM3 break register 0x00

0x00 5296 TIM3_OISR TIM3 output idle state register 0x00

0x00 5297 to

0x00 52AF Reserved area (25 bytes)

Table 7. General hardware register map (continued)

Address Block Register label Register name Reset

status

Memory and register map STM8L052R8

42/109 Doc ID023337 Rev 2

0x00 52B0

TIM1

TIM1_CR1 TIM1 control register 1 0x00

0x00 52B1 TIM1_CR2 TIM1 control register 2 0x00

0x00 52B2 TIM1_SMCR TIM1 Slave mode control register 0x00

0x00 52B3 TIM1_ETR TIM1 external trigger register 0x00

0x00 52B4 TIM1_DER TIM1 DMA1 request enable register 0x00

0x00 52B5 TIM1_IER TIM1 Interrupt enable register 0x00

0x00 52B6 TIM1_SR1 TIM1 status register 1 0x00

0x00 52B7 TIM1_SR2 TIM1 status register 2 0x00

0x00 52B8 TIM1_EGR TIM1 event generation register 0x00

0x00 52B9 TIM1_CCMR1 TIM1 Capture/Compare mode register 1 0x00

0x00 52BA TIM1_CCMR2 TIM1 Capture/Compare mode register 2 0x00

0x00 52BB TIM1_CCMR3 TIM1 Capture/Compare mode register 3 0x00

0x00 52BC TIM1_CCMR4 TIM1 Capture/Compare mode register 4 0x00

0x00 52BD TIM1_CCER1 TIM1 Capture/Compare enable register 1 0x00

0x00 52BE TIM1_CCER2 TIM1 Capture/Compare enable register 2 0x00

0x00 52BF TIM1_CNTRH TIM1 counter high 0x00

0x00 52C0 TIM1_CNTRL TIM1 counter low 0x00

0x00 52C1 TIM1_PSCRH TIM1 prescaler register high 0x00

0x00 52C2 TIM1_PSCRL TIM1 prescaler register low 0x00

0x00 52C3 TIM1_ARRH TIM1 Auto-reload register high 0xFF

0x00 52C4 TIM1_ARRL TIM1 Auto-reload register low 0xFF

0x00 52C5 TIM1_RCR TIM1 Repetition counter register 0x00

0x00 52C6 TIM1_CCR1H TIM1 Capture/Compare register 1 high 0x00

0x00 52C7 TIM1_CCR1L TIM1 Capture/Compare register 1 low 0x00

0x00 52C8 TIM1_CCR2H TIM1 Capture/Compare register 2 high 0x00

0x00 52C9 TIM1_CCR2L TIM1 Capture/Compare register 2 low 0x00

0x00 52CA TIM1_CCR3H TIM1 Capture/Compare register 3 high 0x00

0x00 52CB TIM1_CCR3L TIM1 Capture/Compare register 3 low 0x00

0x00 52CC TIM1_CCR4H TIM1 Capture/Compare register 4 high 0x00

0x00 52CD TIM1_CCR4L TIM1 Capture/Compare register 4 low 0x00

0x00 52CE TIM1_BKR TIM1 break register 0x00

0x00 52CF TIM1_DTR TIM1 dead-time register 0x00

0x00 52D0 TIM1_OISR TIM1 output idle state register 0x00

0x00 52D1 TIM1_DCR1 DMA1 control register 1 0x00

Table 7. General hardware register map (continued)

Address Block Register label Register name Reset

status

STM8L052R8 Memory and register map

Doc ID023337 Rev 2 43/109

0x00 52D2 TIM1 TIM1_DCR2 TIM1 DMA1 control register 2 0x00

0x00 52D3 TIM1_DMA1R TIM1 DMA1 address for burst mode 0x00

0x00 52D4 to

0x00 52DF Reserved area (12 bytes)

0x00 52E0

TIM4

TIM4_CR1 TIM4 control register 1 0x00

0x00 52E1 TIM4_CR2 TIM4 control register 2 0x00

0x00 52E2 TIM4_SMCR TIM4 Slave mode control register 0x00

0x00 52E3 TIM4_DER TIM4 DMA1 request enable register 0x00

0x00 52E4 TIM4_IER TIM4 Interrupt enable register 0x00

0x00 52E5 TIM4_SR1 TIM4 status register 1 0x00

0x00 52E6 TIM4_EGR TIM4 Event generation register 0x00

0x00 52E7 TIM4_CNTR TIM4 counter 0x00

0x00 52E8 TIM4_PSCR TIM4 prescaler register 0x00

0x00 52E9 TIM4_ARR TIM4 Auto-reload register 0x00

0x00 52EA to

0x00 52FE Reserved area (21 bytes)

0x00 52FF IRTIM IR_CR Infrared control register 0x00

0x00 5300

TIM5

TIM5_CR1 TIM5 control register 1 0x00

0x00 5301 TIM5_CR2 TIM5 control register 2 0x00

0x00 5302 TIM5_SMCR TIM5 Slave mode control register 0x00

0x00 5303 TIM5_ETR TIM5 external trigger register 0x00

0x00 5304 TIM5_DER TIM5 DMA1 request enable register 0x00

0x00 5305 TIM5_IER TIM5 interrupt enable register 0x00

0x00 5306 TIM5_SR1 TIM5 status register 1 0x00

0x00 5307 TIM5_SR2 TIM5 status register 2 0x00

0x00 5308 TIM5_EGR TIM5 event generation register 0x00

0x00 5309 TIM5_CCMR1 TIM5 Capture/Compare mode register 1 0x00

0x00 530A TIM5_CCMR2 TIM5 Capture/Compare mode register 2 0x00

0x00 530B TIM5_CCER1 TIM5 Capture/Compare enable register 1 0x00

0x00 530C TIM5_CNTRH TIM5 counter high 0x00

0x00 530D TIM5_CNTRL TIM5 counter low 0x00

0x00 530E TIM5_PSCR TIM5 prescaler register 0x00

0x00 530F TIM5_ARRH TIM5 Auto-reload register high 0xFF

0x00 5310 TIM5_ARRL TIM5 Auto-reload register low 0xFF

Table 7. General hardware register map (continued)

Address Block Register label Register name Reset

status

Memory and register map STM8L052R8

44/109 Doc ID023337 Rev 2

0x00 5311

TIM5

TIM5_CCR1H TIM5 Capture/Compare register 1 high 0x00

0x00 5312 TIM5_CCR1L TIM5 Capture/Compare register 1 low 0x00

0x00 5313 TIM5_CCR2H TIM5 Capture/Compare register 2 high 0x00

0x00 5314 TIM5_CCR2L TIM5 Capture/Compare register 2 low 0x00

0x00 5315 TIM5_BKR TIM5 break register 0x00

0x00 5316 TIM5_OISR TIM5 output idle state register 0x00

0x00 5317

0x00 533F

Reserved area

0x00 5340

ADC1

ADC1_CR1 ADC1 configuration register 1 0x00

0x00 5341 ADC1_CR2 ADC1 configuration register 2 0x00

0x00 5342 ADC1_CR3 ADC1 configuration register 3 0x1F

0x00 5343 ADC1_SR ADC1 status register 0x00

0x00 5344 ADC1_DRH ADC1 data register high 0x00

0x00 5345 ADC1_DRL ADC1 data register low 0x00

0x00 5346 ADC1_HTRH ADC1 high threshold register high 0x0F

0x00 5347 ADC1_HTRL ADC1 high threshold register low 0xFF

0x00 5348 ADC1_LTRH ADC1 low threshold register high 0x00

0x00 5349 ADC1_LTRL ADC1 low threshold register low 0x00

0x00 534A ADC1_SQR1 ADC1 channel sequence 1 register 0x00

0x00 534B ADC1_SQR2 ADC1 channel sequence 2 register 0x00

0x00 534C ADC1_SQR3 ADC1 channel sequence 3 register 0x00

0x00 534D ADC1_SQR4 ADC1 channel sequence 4 register 0x00

0x00 534E ADC1_TRIGR1 ADC1 trigger disable 1 0x00

0x00 534F ADC1_TRIGR2 ADC1 trigger disable 2 0x00

0x00 5350 ADC1_TRIGR3 ADC1 trigger disable 3 0x00

0x00 5351 ADC1_TRIGR4 ADC1 trigger disable 4 0x00

0x00 5352 to

0x00 53BF Reserved area (110 bytes)

Table 7. General hardware register map (continued)

Address Block Register label Register name Reset

status

STM8L052R8 Memory and register map

Doc ID023337 Rev 2 45/109

0x00 53C0

SPI2

SPI2_CR1 SPI2 control register 1 0x00

0x00 53C1 SPI2_CR2 SPI2 control register 2 0x00

0x00 53C2 SPI2_ICR SPI2 interrupt control register 0x00

0x00 53C3 SPI2_SR SPI2 status register 0x02

0x00 53C4 SPI2_DR SPI2 data register 0x00

0x00 53C5 SPI2_CRCPR SPI2 CRC polynomial register 0x07

0x00 53C6 SPI2_RXCRCR SPI2 Rx CRC register 0x00

0x00 53C7 SPI2_TXCRCR SPI2 Tx CRC register 0x00

0x00 53C8 to

0x00 53DF Reserved area

0x00 53E0

USART2

USART2_SR USART2 status register 0xC0

0x00 53E1 USART2_DR USART2 data register 0xXX

0x00 53E2 USART2_BRR1 USART2 baud rate register 1 0x00

0x00 53E3 USART2_BRR2 USART2 baud rate register 2 0x00

0x00 53E4 USART2_CR1 USART2 control register 1 0x00

0x00 53E5 USART2_CR2 USART2 control register 2 0x00

0x00 53E6 USART2_CR3 USART2 control register 3 0x00

0x00 53E7 USART2_CR4 USART2 control register 4 0x00

0x00 53E8 USART2_CR5 USART2 control register 5 0x00

0x00 53E9 USART2_GTR USART2 guard time register 0x00

0x00 53EA USART2_PSCR USART2 prescaler register 0x00

0x00 53EB to

0x00 53EF Reserved area

0x00 53F0

USART3

USART3_SR USART3 status register 0xC0

0x00 53F1 USART3_DR USART3 data register 0xXX

0x00 53F2 USART3_BRR1 USART3 baud rate register 1 0x00

0x00 53F3 USART3_BRR2 USART3 baud rate register 2 0x00

0x00 53F4 USART3_CR1 USART3 control register 1 0x00

0x00 53F5 USART3_CR2 USART3 control register 2 0x00

0x00 53F6 USART3_CR3 USART3 control register 3 0x00

0x00 53F7 USART3_CR4 USART3 control register 4 0x00

0x00 53F8 USART3_CR5 USART3 control register 5 0x00

0x00 53F9 USART3_GTR USART3 guard time register 0x00

0x00 53FA USART3_PSCR USART3 prescaler register 0x00

Table 7. General hardware register map (continued)

Address Block Register label Register name Reset

status

Memory and register map STM8L052R8

46/109 Doc ID023337 Rev 2

0x00 53FB to

0x00 53FF Reserved area

0x00 5400

LCD

LCD_CR1 LCD control register 1 0x00

0x00 5401 LCD_CR2 LCD control register 2 0x00

0x00 5402 LCD_CR3 LCD control register 3 0x00

0x00 5403 LCD_FRQ LCD frequency selection register 0x00

0x00 5404 LCD_PM0 LCD Port mask register 0 0x00

0x00 5405 LCD_PM1 LCD Port mask register 1 0x00

0x00 5406 LCD_PM2 LCD Port mask register 2 0x00

0x00 5407 Reserved area

0x00 5408 LCD_PM4 LCD Port mask register 4 0x00

0x00 5409 to

0x00 540B

LCD

Reserved area (3 bytes)

0x00 540C LCD_RAM0 LCD display memory 0 0x00

0x00 540D LCD_RAM1 LCD display memory 1 0x00

0x00 540E LCD_RAM2 LCD display memory 2 0x00

0x00 540F LCD_RAM3 LCD display memory 3 0x00

0x00 5410 LCD_RAM4 LCD display memory 4 0x00

0x00 5411 LCD_RAM5 LCD display memory 5 0x00

0x00 5412 LCD_RAM6 LCD display memory 6 0x00

0x00 5413 LCD_RAM7 LCD display memory 7 0x00

0x00 5414 LCD_RAM8 LCD display memory 8 0x00

0x00 5415 LCD_RAM9 LCD display memory 9 0x00

0x00 5416 LCD_RAM10 LCD display memory 10 0x00

0x00 5417 LCD_RAM11 LCD display memory 11 0x00

0x00 5418 LCD_RAM12 LCD display memory 12 0x00

0x00 5419 LCD_RAM13 LCD display memory 13 0x00

0x00 541A Reserved area

0x00 541B LCD_RAM15 LCD display memory 15 0x00

0x00 541C Reserved area

0x00 541D LCD_RAM17 LCD display memory 17 0x00

0x00 541E Reserved area

0x00 541F LCD_RAM19 LCD display memory 19 0x00

0x00 5420 Reserved area

0x00 5421 LCD_RAM21 LCD display memory 21 0x00

Table 7. General hardware register map (continued)

Address Block Register label Register name Reset

status

STM8L052R8 Memory and register map

Doc ID023337 Rev 2 47/109

0x00 5422 to

0x00 542E Reserved area

0x00 542F LCD LCD_CR4 LCD control register 4 0x00

0x00 5430

Reserved area (1 byte) 0x00

0x00 5431 RI_ICR1 Timer input capture routing register 1 0x00

0x00 5432 RI_ICR2 Timer input capture routing register 2 0x00

0x00 5433 RI_IOIR1 I/O input register 1 0xXX

0x00 5434 RI_IOIR2 I/O input register 2 0xXX

0x00 5435 RI_IOIR3 I/O input register 3 0xXX

0x00 5436 RI_IOCMR1 I/O control mode register 1 0x00

0x00 5437 RI_IOCMR2 I/O control mode register 2 0x00

0x00 5438 RI_IOCMR3 I/O control mode register 3 0x00

0x00 5439 RI_IOSR1 I/O switch register 1 0x00

0x00 543A RI_IOSR2 I/O switch register 2 0x00

0x00 543B RI_IOSR3 I/O switch register 3 0x00

0x00 543C RI_IOGCR I/O group control register 0x3F

0x00 543D RI_ASCR1 Analog switch register 1 0x00

0x00 543E RI_ASCR2 Analog switch register 2 0x00

0x00 543F RI_RCR Resistor control register 1 0x00

0x00 5440 to

0x00 5444 Reserved area (5 bytes)

1. These registers are not impacted by a system reset. They are reset at power-on.

Table 7. General hardware register map (continued)

Address Block Register label Register name Reset

status

Memory and register map STM8L052R8

48/109 Doc ID023337 Rev 2

Table 8. CPU/SWIM/debug module/interrupt controller registers

Address Block Register Label Register Name Reset

Status

0x00 7F00

CPU(1)

A Accumulator 0x00

0x00 7F01 PCE Program counter extended 0x00

0x00 7F02 PCH Program counter high 0x00

0x00 7F03 PCL Program counter low 0x00

0x00 7F04 XH X index register high 0x00

0x00 7F05 XL X index register low 0x00

0x00 7F06 YH Y index register high 0x00

0x00 7F07 YL Y index register low 0x00

0x00 7F08 SPH Stack pointer high 0x03

0x00 7F09 SPL Stack pointer low 0xFF

0x00 7F0A CCR Condition code register 0x28

0x00 7F0B to

0x00 7F5F CPU Reserved area (85 bytes)

0x00 7F60 CFG_GCR Global configuration register 0x00

0x00 7F70

ITC-SPR

ITC_SPR1 Interrupt Software priority register 1 0xFF

0x00 7F71 ITC_SPR2 Interrupt Software priority register 2 0xFF

0x00 7F72 ITC_SPR3 Interrupt Software priority register 3 0xFF

0x00 7F73 ITC_SPR4 Interrupt Software priority register 4 0xFF

0x00 7F74 ITC_SPR5 Interrupt Software priority register 5 0xFF

0x00 7F75 ITC_SPR6 Interrupt Software priority register 6 0xFF

0x00 7F76 ITC_SPR7 Interrupt Software priority register 7 0xFF

0x00 7F77 ITC_SPR8 Interrupt Software priority register 8 0xFF

0x00 7F78 to

0x00 7F79 Reserved area (2 bytes)

0x00 7F80 SWIM SWIM_CSR SWIM control status register 0x00

0x00 7F81 to

0x00 7F8F Reserved area (15 bytes)

STM8L052R8 Memory and register map

Doc ID023337 Rev 2 49/109

0x00 7F90

DM_BK1RE DM breakpoint 1 register extended byte 0xFF

0x00 7F91 DM_BK1RH DM breakpoint 1 register high byte 0xFF

0x00 7F92 DM_BK1RL DM breakpoint 1 register low byte 0xFF

0x00 7F93 DM_BK2RE DM breakpoint 2 register extended byte 0xFF

0x00 7F94 DM_BK2RH DM breakpoint 2 register high byte 0xFF

0x00 7F95 DM_BK2RL DM breakpoint 2 register low byte 0xFF

0x00 7F96 DM_CR1 DM Debug module control register 1 0x00

0x00 7F97 DM_CR2 DM Debug module control register 2 0x00

0x00 7F98 DM_CSR1 DM Debug module control/status register 1 0x10

0x00 7F99 DM_CSR2 DM Debug module control/status register 2 0x00

0x00 7F9A DM_ENFCTR DM enable function register 0xFF

0x00 7F9B to

0x00 7F9F Reserved area (5 bytes)

1. Accessible by debug module only

Table 8. CPU/SWIM/debug module/interrupt controller registers (continued)

Address Block Register Label Register Name Reset

Status

Interrupt vector mapping STM8L052R8
50/109 Doc ID023337 Rev 2
6  Interrupt vector mapping
         
Table 9. Interrupt mapping
IRQ
No.
Source 
block Description
Wakeup 
from Halt 
mode
Wakeup 
from 
Active-
halt mode
Wakeup 
from Wait 
(WFI 
mode)
Wakeup 
from Wait 
(WFE 
mode)(1)
Vector 
address
RESET Reset Yes Yes Yes Yes 0x00 8000
TRAP Software interrupt - - - - 0x00 8004
0TLI
(2) External Top level Interrupt - - - - 0x00 8008
1 FLASH EOP/WR_PG_DIS - - Yes Yes(5) 0x00 800C
2 DMA1 0/1 DMA1 channels 0/1  - - Yes Yes(5) 0x00 8010
3 DMA1 2/3 DMA1 channels 2/3  - - Yes Yes(5) 0x00 8014
4RTC/LSE_
CSS
RTC alarm interrupt/LSE
CSS interrupt Yes Yes Yes Yes 0x00 8018
5EXTI E/F/
PVD(3)
PortE/F interrupt/PVD 
interrupt Ye s Ye s Ye s Ye s (5) 0x00 801C
6 EXTIB/G External interrupt port B/G Yes Yes Yes Yes(5) 0x00 8020
7 EXTID/H External interrupt port D Yes Yes Yes Yes(5) 0x00 8024
8 EXTI0 External interrupt 0 Yes Yes Yes Yes(5) 0x00 8028
9 EXTI1 External interrupt 1 Yes Yes Yes Yes(5) 0x00 802C
10 EXTI2 External interrupt 2 Yes Yes Yes Yes(5) 0x00 8030
11 EXTI3 External interrupt 3 Yes Yes Yes Yes(5) 0x00 8034
12 EXTI4 External interrupt 4 Yes Yes Yes Yes(5) 0x00 8038
13 EXTI5 External interrupt 5 Yes Yes Yes Yes(5) 0x00 803C
14 EXTI6 External interrupt 6 Yes Yes Yes Yes(5) 0x00 8040
15 EXTI7 External interrupt 7 Yes Yes Yes Yes(5) 0x00 8044
16 LCD LCD interrupt - - Yes Yes 0x00 8048
17 CLK/TIM1
system clock switch/
CSS interrupt/
TIM 1 break
--YesYes
(5) 0x00 804C
18 ADC1 ACD1 Yes Yes Yes Yes(5) 0x00 8050
19 TIM2/USART2
TIM2 update/overflow/ 
trigger/break
USART2 transmission
complete/transmit data
register empty
interrupt
--YesYes
(5) 0x00 8054
20 TIM2/USART2 capture/
compare/USART2 interrupt --YesYes
(5) 0x00 8058

STM8L052R8 Interrupt vector mapping

Doc ID023337 Rev 2 51/109

21 TIM3/USART3

TIM3 update/overflow/

trigger/break USART3

transmission

complete/transmit data

interrupt

--YesYes

(5) 0x00 805C

22 TIM3/USART3

TIM3

capture/compareUSART3

Receive register

data full/overrun/idle line

detected/parity error/

interrupt

--YesYes

(5) 0x00 8060

23 TIM1 Update /overflow/trigger/

COM ---Yes

(5) 0x00 8064

24 TIM1 Capture/compare - - - Yes(5) 0x00 8068

25 TIM4 TIM4 update/overflow/

trigger --YesYes

(5) 0x00 806C

26 SPI1 End of Transfer Yes Yes Yes Yes(5) 0x00 8070

27 USART1/TIM5

USART1 transmission

complete/transmit data

TIM5 update/overflow/

trigger/break

--YesYes

(5) 0x00 8074

28 USART1/TIM5

USART1 received data

ready/overrun error/

idle line detected/parity

error/TIM5

capture/compare

--YesYes

(5) 0x00 8078

29 I2C1/SPI2 I2C1 interrupt(4)/ S P I 2 Ye s Ye s Ye s Ye s (5) 0x00 807C

1. The Low power wait mode is entered when executing a WFE instruction in Low power run mode.

2. The TLI interrupt is the logic OR between TIM2 overflow interrupt, and TIM4 overflow interrupts.

3. The interrupt from PVD is logically OR-ed with Port E and F interrupts. Register EXTI_CONF allows to select between Port

E and Port F interrupt (see External interrupt port select register (EXTI_CONF) in the RM0031).

4. The device is woken up from Halt or Active-halt mode only when the address received matches the interface address.

5. In WFE mode, this interrupt is served if it has been previously enabled. After processing the interrupt, the processor goes

back to WFE mode. When this interrupt is configured as a wakeup event, the CPU wakes up and resumes processing.

Table 9. Interrupt mapping (continued)

IRQ

No.

Source

block Description

Wakeup

from Halt

mode

Wakeup

from

Active-

halt mode

Wakeup

from Wait

(WFI

mode)

Wakeup

from Wait

(WFE

mode)(1)

Vector

address

Option bytes STM8L052R8

52/109 Doc ID023337 Rev 2

7 Option bytes

Option bytes contain configurations for device hardware features as well as the memory

protection of the device. They are stored in a dedicated memory block.

All option bytes can be modified in ICP mode (with SWIM) by accessing the EEPROM

address. See Ta b l e 1 0 for details on option byte addresses.

The option bytes can also be modified ‘on the fly’ by the application in IAP mode, except for

the ROP, UBC and PCODESIZE values which can only be taken into account when they are

modified in ICP mode (with the SWIM).

Refer to the STM8Lxx Flash programming manual (PM0054) and STM8 SWIM and Debug

Manual (UM0320) for information on SWIM programming procedures.

Table 10. Option byte addresses

Address Option name

Option

byte

No.

Option bits Factory

default

setting

7654 3 2 1 0

00 4800

Read-out

protection

(ROP)

OPT0 ROP[7:0] 0x00

00 4802 UBC (User

Boot code size) OPT1 UBC[7:0] 0x00

00 4807 PCODESIZE OPT2 PCODE[7:0] 0x00

00 4808

Independent

watchdog

option

OPT3

[3:0] Reserved WWDG

_HALT

WWDG

_HW

IWDG

_HALT

IWDG

_HW 0x00

00 4809

Number of

stabilization

clock cycles for

HSE and LSE

oscillators

OPT4 Reserved LSECNT[1:0] HSECNT[1:0] 0x00

00 480A Brownout reset

(BOR)

OPT5

[3:0] Reserved BOR_TH BOR_

ON 0x01

00 480B Bootloader

option bytes

(OPTBL)

OPTBL

[15:0] OPTBL[15:0]

0x00

00 480C 0x00

STM8L052R8 Option bytes

Doc ID023337 Rev 2 53/109

Table 11. Option byte description

Option

byte no. Option description

OPT0

ROP[7:0] Memory readout protection (ROP)

0xAA: Disable readout protection (write access via SWIM protocol)

Refer to Readout protection section in the STM8L reference manual (RM0031).

OPT1

UBC[7:0] Size of the user boot code area

0x00: No UBC

0x01: Page 0 reserved for the UBC and write protected.

...

0xFF: Page 0 to 254 reserved for the UBC and write-protected.

Refer to User boot code section in the STM8L reference manual (RM0031).

OPT2

PCODESIZE[7:0] Size of the proprietary code area

0x00: No proprietary code area

0x01: Page 0 reserved for the proprietary code and read/write protected.

...

0xFF: Page 0 to 254 reserved for the proprietary code and read/write protected.

Refer to Proprietary code area (PCODE) section in the STM8L reference manual

(RM0031) for more details.

OPT3

IWDG_HW: Independent watchdog

0: Independent watchdog activated by software

1: Independent watchdog activated by hardware

IWDG_HALT: Independent watchdog off in Halt/Active-halt

0: Independent watchdog continues running in Halt/Active-halt mode

1: Independent watchdog stopped in Halt/Active-halt mode

WWDG_HW: Window watchdog

0: Window watchdog activated by software

1: Window watchdog activated by hardware

WWDG_HALT: Window window watchdog reset on Halt/Active-halt

0: Window watchdog stopped in Halt mode

1: Window watchdog generates a reset when MCU enters Halt mode

OPT4

HSECNT: Number of HSE oscillator stabilization clock cycles

0x00 - 1 clock cycle

0x01 - 16 clock cycles

0x10 - 512 clock cycles

0x11 - 4096 clock cycles

LSECNT: Number of LSE oscillator stabilization clock cycles

0x00 - 1 clock cycle

0x01 - 16 clock cycles

0x10 - 512 clock cycles

0x11 - 4096 clock cycles

Option bytes STM8L052R8

54/109 Doc ID023337 Rev 2

OPT5

BOR_ON:

0: Brownout reset off

1: Brownout reset on

BOR_TH[3:1]: Brownout reset thresholds. Refer to Ta b l e 1 6 for details on the thresholds

according to the value of BOR_TH bits.

OPTBL

OPTBL[15:0]:

This option is checked by the boot ROM code after reset. Depending on the content of

addresses 00 480B, 00 480C and 0x8000 (reset vector) the CPU jumps to the

bootloader or to the reset vector.

Refer to the UM0560 bootloader user manual for more details.

Table 11. Option byte description (continued)

Option

byte no. Option description

STM8L052R8 Electrical parameters

Doc ID023337 Rev 2 55/109

8 Electrical parameters

8.1 Parameter conditions

Unless otherwise specified, all voltages are referred to VSS.

8.1.1 Minimum and maximum values

Unless otherwise specified the minimum and maximum values are guaranteed in the worst

conditions of ambient temperature, supply voltage and frequencies by tests in production on

100% of the devices with an ambient temperature at TA= 25 °C and TA = TA max (given by

the selected temperature range).

Data based on characterization results, design simulation and/or technology characteristics

are indicated in the table footnotes and are not tested in production. Based on

characterization, the minimum and maximum values refer to sample tests and represent the

mean value plus or minus three times the standard deviation (mean±3Σ).

8.1.2 Typical values

Unless otherwise specified, typical data are based on TA = 25 °C, VDD = 3 V. They are given

only as design guidelines and are not tested.

Typical ADC accuracy values are determined by characterization of a batch of samples from

a standard diffusion lot over the full temperature range, where 95% of the devices have an

error less than or equal to the value indicated (mean±2Σ).

8.1.3 Typical curves

Unless otherwise specified, all typical curves are given only as design guidelines and are

not tested.

8.1.4 Loading capacitor

The loading conditions used for pin parameter measurement are shown in Figure 5.

Figure 5. Pin loading conditions

50 pF

STM8L PIN

Electrical parameters STM8L052R8

56/109 Doc ID023337 Rev 2

8.1.5 Pin input voltage

The input voltage measurement on a pin of the device is described in Figure 6.

Figure 6. Pin input voltage

8.2 Absolute maximum ratings

Stresses above those listed as “absolute maximum ratings” may cause permanent damage

to the device. This is a stress rating only and functional operation of the device under these

conditions is not implied. Exposure to maximum rating conditions for extended periods may

affect device reliability.

VIN

STM8L PIN

Table 12. Voltage characteristics

Symbol Ratings Min Max Unit

VDD- VSS

External supply voltage

(including VDDA)(1)

1. All power (VDD1, VDD2, VDD3, VDD4, VDDA) and ground (VSS1, VSS2, VSS3, VSS4, VSSA) pins must always

be connected to the external power supply.

- 0.3 4.0

VIN(2)

2. VIN maximum must always be respected. Refer to Table 13. for maximum allowed injected current values.

Input voltage on true open-drain pins

(PC0 and PC1) VSS - 0.3 VDD + 4.0

Input voltage on five-volt tolerant (FT)

pins VSS - 0.3 VDD + 4.0

Input voltage on any other pin VSS - 0.3 4.0

VESD Electrostatic discharge voltage

see Absolute maximum

ratings (electrical sensitivity)

on page 102

STM8L052R8 Electrical parameters

Doc ID023337 Rev 2 57/109

Table 13. Current characteristics

Symbol Ratings Max. Unit

IVDD Total current into VDD power line (source) 80

IVSS Total current out of VSS ground line (sink) 80

IIO

Output current sunk by IR_TIM pin

(with high sink LED driver capability) 80

Output current sunk by any other I/O and control pin 25

Output current sourced by any I/Os and control pin - 25

IINJ(PIN)

Injected current on true open-drain pins (PC0 and PC1)(1) - 5 / +0

Injected current on five-volt tolerant (FT) pins(1)

1. Positive injection is not possible on these I/Os. A negative injection is induced by VIN<VSS. IINJ(PIN) must

never be exceeded. Refer to Table 12. for maximum allowed input voltage values.

- 5 / +0

Injected current on any other pin (2)

2. A positive injection is induced by VIN>VDD while a negative injection is induced by VIN<VSS. IINJ(PIN) must

never be exceeded. Refer to Table 12. for maximum allowed input voltage values.

- 5 / +5

ΣIINJ(PIN) Total injected current (sum of all I/O and control pins) (3)

3. When several inputs are submitted to a current injection, the maximum ΣIINJ(PIN) is the absolute sum of the

positive and negative injected currents (instantaneous values).

± 25

Table 14. Thermal characteristics

Symbol Ratings Value Unit

TSTG Storage temperature range -65 to +150 ° C

TJMaximum junction temperature 150

Electrical parameters STM8L052R8

58/109 Doc ID023337 Rev 2

8.3 Operating conditions

Subject to general operating conditions for VDD and TA.

8.3.1 General operating conditions

Table 15. General operating conditions

Symbol Parameter Conditions Min. Max. Unit

fSYSCLK(1) System clock

frequency 1.8 V ≤ VDD < 3.6 V 0 16 MHz

VDD

Standard operating

voltage 1.8 3.6 V

VDDA Analog operating

voltage

Must be at the same

potential as VDD

1.8 3.6 V

PD(2) Power dissipation at

TA= 85 °C LQFP64 288 mW

TATemperature range 1.8 V ≤ VDD < 3.6 V -40 85

°C

Junction temperature

range -40 °C ≤ TA < 85 °C -40 105(3)

1. fSYSCLK = fCPU

2. To calculate PDmax(TA), use the formula PDmax=(TJmax -TA)/ΘJA with TJmax in this table and ΘJA in “Thermal

characteristics” table.

3. TJmax is given by the test limit. Above this value the product behavior is not guaranteed.

STM8L052R8 Electrical parameters

Doc ID023337 Rev 2 59/109

8.3.2 Embedded reset and power control block characteristics

Table 16. Embedded reset and power control block characteristics

Symbol Parameter Conditions Min. Typ. Max. Unit

tVDD

VDD rise time rate

BOR detector

enabled 0(1) ∞(1) µs/V

BOR detector

disabled 0(1) 1(1) ms/V

VDD fall time rate

BOR detector

enabled 20(1) ∞(1) µs/V

BOR detector

disabled Reset below voltage functional range

tTEMP Reset release delay

VDD rising

BOR detector

enabled

VDD rising

BOR detector

disabled

VPOR Power-on reset threshold Rising edge 1.3(2) 1.5 1.65

VPDR Power-down reset threshold Falling edge 1.3(2) 1.5 1.65

VBOR0

Brown-out reset threshold 0

(BOR_TH[2:0]=000)

Falling edge 1.67 1.7 1.74

Rising edge 1.69 1.75 1.80

VBOR1

Brown-out reset threshold 1

(BOR_TH[2:0]=001)

Falling edge 1.87 1.93 1.97

Rising edge 1.96 2.04 2.07

VBOR2

Brown-out reset threshold 2

(BOR_TH[2:0]=010)

Falling edge 2.22 2.3 2.35

Rising edge 2.31 2.41 2.44

VBOR3

Brown-out reset threshold 3

(BOR_TH[2:0]=011)

Falling edge 2.45 2.55 2.60

Rising edge 2.54 2.66 2.7

VBOR4

Brown-out reset threshold 4

(BOR_TH[2:0]=100)

Falling edge 2.68 2.80 2.85

Rising edge 2.78 2.90 2.95

Electrical parameters STM8L052R8

60/109 Doc ID023337 Rev 2

VPVD0 PVD threshold 0 Falling edge 1.80 1.84 1.88

Rising edge 1.88 1.94 1.99

VPVD1 PVD threshold 1 Falling edge 1.98 2.04 2.09

Rising edge 2.08 2.14 2.18

VPVD2 PVD threshold 2 Falling edge 2.2 2.24 2.28

Rising edge 2.28 2.34 2.38

VPVD3 PVD threshold 3 Falling edge 2.39 2.44 2.48

Rising edge 2.47 2.54 2.58

VPVD4 PVD threshold 4 Falling edge 2.57 2.64 2.69

Rising edge 2.68 2.74 2.79

VPVD5 PVD threshold 5 Falling edge 2.77 2.83 2.88

Rising edge 2.87 2.94 2.99

VPVD6 PVD threshold 6 Falling edge 2.97 3.05 3.09

Rising edge 3.08 3.15 3.20

Vhyst Hysteresis voltage

BOR0 threshold 40

All BOR and PVD

thresholds

excepting BOR0

100

1. Data guaranteed by design, not tested in production.

2. Data based on characterization results, not tested in production.

Table 16. Embedded reset and power control block characteristics (continued)

Symbol Parameter Conditions Min. Typ. Max. Unit

STM8L052R8 Electrical parameters

Doc ID023337 Rev 2 61/109

Figure 7. Power supply thresholds

VDD/VDDA

PVD output

100 mV

hysteresis

VPVD

VBOR hyster esis

100 mV

IT enabled

BOR reset

(NRST)

POR/PDR reset

(NR ST)

PVD

BOR always active

POR/PDR (BOR not available) ai17211b

POR

V/PDR

BOR/PDR reset

(NRST)

BOR disabled by option byte

(Note 1)

(Note 2)

(Note 3)

(Note 4)

Electrical parameters STM8L052R8

62/109 Doc ID023337 Rev 2

8.3.3 Supply current characteristics

Total current consumption

The MCU is placed under the following conditions:

●All I/O pins in input mode with a static value at VDD or VSS (no load)

●All peripherals are disabled except if explicitly mentioned.

In the following table, data are based on characterization results, unless otherwise specified.

Subject to general operating conditions for VDD and TA.

Table 17. Total current consumption in Run mode

Symbol Parameter Conditions(1) Typ.

Max.

Unit

55°C 85 °C

IDD(RUN)

Supply

current in

run mode(2)

All peripherals

OFF,

code executed

from RAM,

VDD from 1.8 V

3.6 V

HSI RC osc.

(16 MHz)(3)

fCPU = 125 kHz 0.22 0.28 0.39

fCPU = 1 MHz 0.32 0.38 0.49

fCPU = 4 MHz 0.59 0.65 0.76

fCPU = 8 MHz 0.93 0.99 1.1

fCPU = 16 MHz 1.62 1.68 1.79(4)

HSE external

clock

(fCPU=fHSE)(5)

fCPU = 125 kHz 0.21 0.25 0.35

fCPU = 1 MHz 0.3 0.34 0.44

fCPU = 4 MHz 0.57 0.61 0.71

fCPU = 8 MHz 0.95 0.99 1.09

fCPU = 16 MHz 1.73 1.77 1.87(4)

LSI RC osc.

(typ. 38 kHz) fCPU = fLSI 0.029 0.035 0.039

LSE external

clock

(32.768 kHz)

fCPU = fLSE 0.028 0.034 0.038

STM8L052R8 Electrical parameters

Doc ID023337 Rev 2 63/109

IDD(RUN)

Supply

current

in Run

mode

All peripherals

OFF, code

executed from

Flash,

VDD from 1.8 V

to 3.6 V

HSI RC

osc.(6)

fCPU = 125 kHz 0.35 0.46 0.48

fCPU = 1 MHz 0.54 0.65 0.67

fCPU = 4 MHz 1.16 1.27 1.29

fCPU = 8 MHz 1.97 2.08 2.1

fCPU = 16 MHz 3.54 3.65 3.67

HSE external

clock

(fCPU=fHSE) (5)

fCPU = 125 kHz 0.35 0.44 0.46

fCPU = 1 MHz 0.53 0.62 0.64

fCPU = 4 MHz 1.13 1.22 1.24

fCPU = 8 MHz 22.092.11

fCPU = 16 MHz 3.69 3.78 3.8

LSI RC osc. fCPU = fLSI 0.110 0.123 0.130

LSE external

clock

(32.768 kHz)(7)

fCPU = fLSE 0.100 0.101 0.104

1. All peripherals OFF, VDD from 1.8 V to 3.6 V, HSI internal RC osc., fCPU=fSYSCLK

2. CPU executing typical data processing

3. The run from RAM consumption can be approximated with the linear formula:

IDD(run_from_RAM) = Freq. * 95 µA/MHz + 250 µA

4. Tested in production.

5. Oscillator bypassed (HSEBYP = 1 in CLK_ECKCR). When configured for external crystal, the HSE consumption

(IDD HSE) must be added. Refer to Table 28.

6. The run from Flash consumption can be approximated with the linear formula:

IDD(run_from_Flash) = Freq. * 200 µA/MHz + 330 µA

7. Oscillator bypassed (LSEBYP = 1 in CLK_ECKCR). When configured for external crystal, the LSE consumption

(IDD LSE) must be added. Refer to Table 29

Table 17. Total current consumption in Run mode (continued)

Symbol Parameter Conditions(1) Typ.

Max.

Unit

55°C 85 °C

Electrical parameters STM8L052R8

64/109 Doc ID023337 Rev 2

Figure 8. Typical IDD(RUN) from RAM vs. VDD (HSI clock source), fCPU =16 MHz 1)

1. Typical current consumption measured with code executed from RAM.

Figure 9. Typical IDD(RUN) from Flash vs. VDD (HSI clock source), fCPU = 16 MHz 1)

1. Typical current consumption measured with code executed from Flash.

0.2

0.4

0.6

0.8

1.2

1.4

1.6

1.8

1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6

IDD Run HSI 16MHz (mA)

VDD (V)

25°C

85 °C

MS19109V2

-40°C

1.5

2.5

3.5

1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6

IDD Run HSI EEP 16MHz (mA)

VDD (V)

25°C

85°C

-40°C

MS19112V2

STM8L052R8 Electrical parameters

Doc ID023337 Rev 2 65/109

In the following table, data are based on characterization results, unless otherwise specified.

Table 18. Total current consumption in Wait mode

Symbol Parameter Conditions(1) Typ

Max

Unit

55°C 85 °C

IDD(Wait)

Supply

current in

Wait mode

CPU not

clocked,

all peripherals

OFF,

code executed

from RAM

with Flash in IDDQ

mode,(2)

VDD from

1.8 V to 3.6 V

HSI

fCPU = 125 kHz 0.21 0.29 0.33

fCPU = 1 MHz 0.25 0.33 0.37

fCPU = 4 MHz 0.32 0.4 0.44

fCPU = 8 MHz 0.42 0.496 0.54

fCPU = 16 MHz 0.66 0.736 0.78(3)

HSE external clock

(fCPU=fHSE)(4)

fCPU = 125 kHz 0.19 0.21 0.3

fCPU = 1 MHz 0.2 0.23 0.32

fCPU = 4 MHz 0.27 0.3 0.39

fCPU = 8 MHz 0.37 0.4 0.49

fCPU = 16 MHz 0.63 0.66 0.75(3)

LSI fCPU = fLSI 0.028 0.037 0.039

LSE(5) external clock

(32.768 kHz) fCPU = fLSE 0.027 0.035 0.038

CPU not

clocked,

all peripherals

OFF,

code executed

from Flash,

VDD from

1.8 V to 3.6 V

HSI

fCPU = 125 kHz 0.27 0.36 0.42

fCPU = 1 MHz 0.29 0.38 0.44

fCPU = 4 MHz 0.37 0.46 0.52

fCPU = 8 MHz 0.45 0.55 0.61

fCPU = 16 MHz 0.69 0.79 0.85

HSE(4) external clock

(fCPU=

HSE)

fCPU = 125 kHz 0.23 0.29 0.32

fCPU = 1 MHz 0.24 0.31 0.34

fCPU = 4 MHz 0.32 0.39 0.42

fCPU = 8 MHz 0.42 0.49 0.51

fCPU = 16 MHz 0.7 0.77 0.79

LSI fCPU = fLSI 0.037 0.085 0.105

LSE(5) external clock

(32.768 kHz) fCPU = fLSE 0.036 0.082 0.095

1. All peripherals OFF, VDD from 1.8 V to 3.6 V, HSI internal RC osc., fCPU = fSYSCLK

2. Flash is configured in IDDQ mode in Wait mode by setting the EPM or WAITM bit in the Flash_CR1 register.

3. Tested in production.

4. Oscillator bypassed (HSEBYP = 1 in CLK_ECKCR). When configured for external crystal, the HSE consumption

(IDD HSE) must be added. Refer to Table 28.

Electrical parameters STM8L052R8

66/109 Doc ID023337 Rev 2

Figure 10. Typical IDD(Wait) from RAM vs. VDD (HSI clock source), fCPU = 16 MHz 1)

1. Typical current consumption measured with code executed from RAM.

Figure 11. Typical IDD(Wait) from Flash (HSI clock source), fCPU = 16 MHz 1)

1. Typical current consumption measured with code executed from Flash.

5. Oscillator bypassed (LSEBYP = 1 in CLK_ECKCR). When configured for external crystal, the LSE consumption

(IDD HSE) must be added. Refer to Table 29

0.2

0.3

0.4

0.5

0.6

0.7

0.8

1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6

IDD Wait HSI 16MHz (mA)

VDD (V)

25°C

85°C

-40°C

MS19113V2

0.2

0.3

0.4

0.5

0.6

0.7

0.8

1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6

IDD Wfi HSI 16MHz EEON (mA)

(V)

25°C

85°C

-40°C

MS19108V2

STM8L052R8 Electrical parameters

Doc ID023337 Rev 2 67/109

In the following table, data are based on characterization results, unless otherwise specified.

Table 19. Total current consumption and timing in Low power run mode at VDD = 1.8 V to

3.6 V

Symbol Parameter Conditions(1) Typ. Max. Unit

IDD(LPR) Supply current in Low

power run mode

LSI RC osc.

(at 38 kHz)

all peripherals OFF

TA = -40 °C

to 25 °C 5.86 6.38

μA

TA = 55 °C 6.52 7.06

TA = 85 °C 7.68 8.7

with TIM2 active(2)

TA = -40 °C

to 25 °C 6.2 6.73

TA = 55 °C 6.86 7.41

TA = 85 °C 9.71 10.81

LSE (3) external

clock

(32.768 kHz)

all peripherals OFF

TA = -40 °C

to 25 °C 5.42 5.94

TA = 55 °C 5.9 6.52

TA = 85 °C 6.14 6.8

with TIM2 active (2)

TA = -40 °C

to 25 °C 5.87 6.48

TA = 55 °C 6.44 6.95

TA = 85 °C 6.7 7.65

1. No floating I/Os

2. Timer 2 clock enabled and counter running

3. Oscillator bypassed (LSEBYP = 1 in CLK_ECKCR). When configured for external crystal, the LSE consumption

(IDD LSE) must be added. Refer to Table 29

Electrical parameters STM8L052R8

68/109 Doc ID023337 Rev 2

Figure 12. Typical IDD(LPR) vs. VDD (LSI clock source), all peripherals OFF

0.005

0.01

0.015

0.02

1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6

IDD LpRun LSI all off (mA)

VDD (V)

25°C

85°C

MS19110V2

- 40°C

STM8L052R8 Electrical parameters

Doc ID023337 Rev 2 69/109

In the following table, data are based on characterization results, unless otherwise specified.

Figure 13. Typical IDD(LPW) vs. VDD (LSI clock source), all peripherals OFF (1)

1. Typical current consumption measured with code executed from RAM.

Table 20. Total current consumption in Low power wait mode at VDD = 1.8 V to 3.6 V

Symbol Parameter Conditions(1) Typ. Max. Unit

IDD(LPW)

Supply current in

Low power wait

mode

LSI RC osc.

(at 38 kHz)

all peripherals OFF

TA = -40 °C to 25 °C 3.03 3.41

μA

TA = 55 °C 3.38 3.78

TA = 85 °C 4.6 5.34

with TIM2 active(2)

TA = -40 °C to 25 °C 3.78 4.21

TA = 55 °C 4.13 4.57

TA = 85 °C 5.29 6.08

LSE external

clock(3)

(32.768 kHz)

all peripherals OFF

TA = -40 °C to 25 °C 2.46 2.89

TA = 55 °C 2.58 3.07

TA = 85 °C 3.32 4.05

with TIM2 active (2)

TA = -40 °C to 25 °C 2.88 3.29

TA = 55 °C 2.97 3.42

TA = 85 °C 3.69 4.55

1. No floating I/Os.

2. Timer 2 clock enabled and counter is running.

3. Oscillator bypassed (LSEBYP = 1 in CLK_ECKCR). When configured for external crystal, the LSE consumption

(IDD LSE) must be added. Refer to Table 29.

0.005

0.01

0.015

0.02

1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6

IDD

Lp Wfi ram LSI all off (m

(V)

°C

-4

0°C

.47

°C

Electrical parameters STM8L052R8

70/109 Doc ID023337 Rev 2

In the following table, data are based on characterization results, unless otherwise specified.

Table 21. Total current consumption and timing in Active-halt mode

at VDD = 1.8 V to 3.6 V

Symbol Parameter Conditions(1) Typ. Max. Unit

IDD(AH) Supply current in

Active-halt mode

LSI RC

(at 38 kHz)

LCD OFF(2)

TA = -40 °C to 25 °C 0.92 2.25

μA

TA = 55 °C 1.32 3.44

TA = 85 °C 1.63 3.87

LCD ON

(static duty/

external

VLCD) (3)

TA = -40 °C to 25 °C 1.56 3.6

TA = 55 °C 1.64 3.8

TA = 85 °C 2.12 5.03

LCD ON

(1/4 duty/

external

VLCD) (4)

TA = -40 °C to 25 °C 1.92 4.56

TA = 55 °C 2.1 4.97

TA = 85 °C 2.6 6.14

LCD ON

(1/4 duty/

internal

VLCD) (5)

TA = -40 °C to 25 °C 4.2 9.88

TA = 55 °C 4.39 10.32

TA = 85 °C 4.84 11.5

IDD(AH) Supply current in

Active-halt mode

LSE external

clock

(32.768 kHz)

(6)

LCD OFF(7)

TA = -40 °C to 25 °C 0.54 1.35

μA

TA = 55 °C 0.61 1.44

TA = 85 °C 0.91 2.27

LCD ON

(static duty/

external

VLCD) (3)

TA = -40 °C to 25 °C 0.91 2.13

TA = 55 °C 1.05 2.55

TA = 85 °C 1.42 3.65

LCD ON

(1/4 duty/

external

VLCD) (4)

TA = -40 °C to 25 °C 1.6 2.84

TA = 55 °C 1.76 4.37

TA = 85 °C 2.14 5.23

LCD ON

(1/4 duty/

internal

VLCD) (5)

TA = -40 °C to 25 °C 3.89 9.15

TA = 55 °C 3.89 9.15

TA = 85 °C 4.25 10.49

IDD(WUFAH)

Supply current during

wakeup time from

Active-halt mode

(using HSI)

2.4 mA

tWU_HSI(AH)(8)(9)

Wakeup time from

Active-halt mode to

Run mode (using HSI)

4.7 7 μs

tWU_LSI(AH)(8)(9)

Wakeup time from

Active-halt mode to

Run mode (using LSI)

150 μs

STM8L052R8 Electrical parameters

Doc ID023337 Rev 2 71/109

Figure 14. Typical IDD(AH) vs. VDD (LSI clock source)

1. No floating I/O, unless otherwise specified.

2. RTC enabled. Clock source = LSI

3. RTC enabled, LCD enabled with external VLCD = 3 V, static duty, division ratio = 256, all pixels active, no LCD connected.

4. RTC enabled, LCD enabled with external VLCD, 1/4 duty, 1/3 bias, division ratio = 64, all pixels active, no LCD connected.

5. LCD enabled with internal LCD booster VLCD = 3 V, 1/4 duty, 1/3 bias, division ratio = 64, all pixels active, no LCD

connected.

6. Oscillator bypassed (LSEBYP = 1 in CLK_ECKCR). When configured for external crystal, the LSE consumption

(IDD LSE) must be added. Refer to Table 29

7. RTC enabled. Clock source = LSE

8. Wakeup time until start of interrupt vector fetch.

The first word of interrupt routine is fetched 4 CPU cycles after tWU.

9. ULP=0 or ULP=1 and FWU=1 in the PWR_CSR2 register.

Table 22. Typical current consumption in Active-halt mode, RTC clocked by LSE external crystal

Symbol Parameter Condition(1) Typ. Unit

IDD(AH) (2) Supply current in Active-halt

mode

VDD = 1.8 V LSE 1.2

µA

LSE/32(3) 0.9

VDD = 3 V LSE 1.4

LSE/32(3) 1.1

VDD = 3.6 V LSE 1.6

LSE/32(3) 1.3

1. No floating I/O, unless otherwise specified.

2. Based on measurements on bench with 32.768 kHz external crystal oscillator.

3. RTC clock is LSE divided by 32.

0.005

0.01

0.015

0.02

1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6

IDD

AHalt (m

(V)

25°C

85°C

-40°C

MS19117V2

Electrical parameters STM8L052R8

72/109 Doc ID023337 Rev 2

In the following table, data are based on characterization results, unless otherwise specified.

Figure 15. Typical IDD(Halt) vs. VDD (internal reference voltage OFF)

Table 23. Total current consumption and timing in Halt mode at VDD = 1.8 to 3.6 V

Symbol Parameter Condition(1) Typ. Max. Unit

IDD(Halt)

Supply current in Halt mode

(Ultra low power ULP bit =1 in

the PWR_CSR2 register)

TA = -40 °C to 25 °C 400 1600(2)

TA = 55 °C 810 2400

TA = 85 °C 1600 4500(2)

IDD(WUHalt)

Supply current during wakeup

time from Halt mode (using

HSI)

2.4 mA

tWU_HSI(Halt)(3)(4) Wakeup time from Halt to Run

mode (using HSI) 4.7 7 µs

tWU_LSI(Halt) (3)(4) Wakeup time from Halt mode

to Run mode (using LSI) 150 µs

1. TA = -40 to 85 °C, no floating I/O, unless otherwise specified

2. Tested in production

3. ULP=0 or ULP=1 and FWU=1 in the PWR_CSR2 register

4. Wakeup time until start of interrupt vector fetch.

The first word of interrupt routine is fetched 4 CPU cycles after tWU

0006

0.008

0.01

0.012

0.014

0.016

0.018

0.02

IDD Haltbgoff (mA)

25°C

85°C

0.002

0.004

0.006

0.008

0.01

0.012

0.014

0.016

0.018

0.02

1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6

IDD Haltbgoff (mA)

VDD (V)

25°C

85°C

-40°C

MS19119V2

STM8L052R8 Electrical parameters

Doc ID023337 Rev 2 73/109

Current consumption of on-chip peripherals

Table 24. Peripheral current consumption

Symbol Parameter Typ.

VDD = 3.0 V Unit

IDD(ALL) Peripherals ON (1) 63

IDD(TIM1) TIM1 supply current(2) 10

µA/MHz

IDD(TIM2) TIM2 supply current (2) 7

IDD(TIM3) TIM3 supply current (2) 7

IDD(TIM5) TIM5 supply current (2) 7

IDD(TIM4) TIM4 timer supply current (2) 3

IDD(USART1) USART1 supply current (3) 5

IDD(USART2) USART2 supply current (3) 5

IDD(USART3) USART3 supply current (3) 5

IDD(SPI1) SPI1 supply current (3) 3

IDD(SPI2) SPI2 supply current (3) 3

IDD(I2C1) I2C1 supply current (3) 4

IDD(DMA1) DMA1 supply current 3

IDD(WWDG) WWDG supply current 1

IDD(ADC1) ADC1 supply current(4) 1500

µA

IDD(PVD/BOR)

Power voltage detector and brownout Reset unit supply current

(5) 2.6

IDD(BOR) Brownout Reset unit supply current (5) 2.4

IDD(IDWDG) Independent watchdog supply current

including LSI supply

current 0.45

excluding LSI

supply current 0.05

1. Peripherals listed above the IDD(ALL) parameter ON: TIM1, TIM2, TIM3, TIM4, TIM5, USART1, USART2, USART3, SPI1,

SPI2, I2C1, DMA1, WWDG.

2. Data based on a differential IDD measurement between all peripherals OFF and a timer counter running at 16 MHz. The

CPU is in Wait mode in both cases. No IC/OC programmed, no I/O pins toggling. Not tested in production.

3. Data based on a differential IDD measurement between the on-chip peripheral in reset configuration and not clocked and

the on-chip peripheral when clocked and not kept under reset. The CPU is in Wait mode in both cases. No I/O pins

toggling. Not tested in production.

4. Data based on a differential IDD measurement between ADC in reset configuration and continuous ADC conversion.

5. Including supply current of internal reference voltage.

Electrical parameters STM8L052R8

74/109 Doc ID023337 Rev 2

8.3.4 Clock and timing characteristics

HSE external clock (HSEBYP = 1 in CLK_ECKCR)

Subject to general operating conditions for VDD and TA.

Table 25. Current consumption under external reset

Symbol Parameter Conditions Typ. Unit

IDD(RST)

Supply current under

external reset (1)

PB1/PB3/PA5 pins are

externally tied to VDD

VDD = 1.8 V 48

µAVDD = 3 V 80

VDD = 3.6 V 95

1. All pins except PA0, PB0 and PB4 are floating under reset. PA0, PB0 and PB4 are configured with pull-up under reset.

PB1, PB3 and PA5 must be tied externally under reset to avoid the consumption due to their schmitt trigger.

Table 26. HSE external clock characteristics

Symbol Parameter Conditions Min. Typ. Max. Unit

fHSE_ext(1)

1. Guaranteed by design, not tested in production.

External clock source

frequency 116MHz

VHSEH OSC_IN input pin high level

voltage 0.7 x VDD VDD

VHSEL OSC_IN input pin low level

voltage VSS 0.3 x VDD

Cin(HSE)(1) OSC_IN input capacitance 2.6 pF

ILEAK_HSE OSC_IN input leakage

current VSS < VIN < VDD ±1 µA

STM8L052R8 Electrical parameters

Doc ID023337 Rev 2 75/109

LSE external clock (LSEBYP=1 in CLK_ECKCR)

Subject to general operating conditions for VDD and TA.

HSE crystal/ceramic resonator oscillator

The HSE clock can be supplied with a 1 to 16 MHz crystal/ceramic resonator oscillator. All

the information given in this paragraph is based on characterization results with specified

typical external components. In the application, the resonator and the load capacitors have

to be placed as close as possible to the oscillator pins in order to minimize output distortion

and startup stabilization time. Refer to the crystal resonator manufacturer for more details

(frequency, package, accuracy...).

Table 27. LSE external clock characteristics

Symbol Parameter Min. Typ. Max. Unit

fLSE_ext(1) External clock source frequency 32.768 kHz

VLSEH(2) OSC32_IN input pin high level voltage 0.7 x VDD VDD

VLSEL(2) OSC32_IN input pin low level voltage VSS 0.3 x VDD

Cin(LSE)(1) OSC32_IN input capacitance 0.6 pF

ILEAK_LSE OSC32_IN input leakage current ±1 µA

1. Guaranteed by design, not tested in production.

2. Data based on characterization results, not tested in production.

Table 28. HSE oscillator characteristics

Symbol Parameter Conditions Min. Typ. Max. Unit

fHSE

High speed external oscillator

frequency 116MHz

RFFeedback resistor 200 kΩ

C(1)(2) Recommended load capacitance 20 pF

IDD(HSE) HSE oscillator power consumption

C = 20 pF,

fOSC = 16 MHz

2.5 (startup)

0.7 (stabilized)(3)

C = 10 pF,

fOSC =16 MHz

2.5 (startup)

0.46 (stabilized)(3)

gmOscillator transconductance 3.5(3) mA/V

tSU(HSE)(4) Startup time VDD is stabilized 1 ms

1. C=

is approximately equivalent to 2 x crystal CLOAD.

2. The oscillator selection can be optimized in terms of supply current using a high quality resonator with small Rm value.

Refer to crystal manufacturer for more details

3. Guaranteed by design. Not tested in production.

4. tSU(HSE) is the startup time measured from the moment it is enabled (by software) to a stabilized 16 MHz oscillation. This

value is measured for a standard crystal resonator and it can vary significantly with the crystal manufacturer.

Electrical parameters STM8L052R8

76/109 Doc ID023337 Rev 2

Figure 16. HSE oscillator circuit diagram

HSE oscillator critical gm formula

Rm: Motional resistance (see crystal specification), Lm: Motional inductance (see crystal specification),

Cm: Motional capacitance (see crystal specification), Co: Shunt capacitance (see crystal specification),

CL1=CL2=C: Grounded external capacitance

gm >> gmcrit

LSE crystal/ceramic resonator oscillator

The LSE clock can be supplied with a 32.768 kHz crystal/ceramic resonator oscillator. All

the information given in this paragraph is based on characterization results with specified

typical external components. In the application, the resonator and the load capacitors have

to be placed as close as possible to the oscillator pins in order to minimize output distortion

and startup stabilization time. Refer to the crystal resonator manufacturer for more details

(frequency, package, accuracy...).

OSC_OUT

OSC_IN

HSE

to core

STM8

Resonator

Consumption

control

Resonator

gmcrit 2Π× fHSE

×()

2Rm

×2Co C+()

Table 29. LSE oscillator characteristics

Symbol Parameter Conditions Min. Typ. Max. Unit

fLSE

Low speed external oscillator

frequency 32.768 kHz

RFFeedback resistor ΔV = 200 mV 1.2 MΩ

C(1)(2) Recommended load capacitance 8pF

IDD(LSE) LSE oscillator power consumption

VDD = 1.8 V 450

nAVDD = 3 V 600

VDD = 3.6 V 750

gmOscillator transconductance 3(3) µA/V

tSU(LSE)(4) Startup time VDD is stabilized 1 s

1. C=

is approximately equivalent to 2 x crystal CLOAD.

2. The oscillator selection can be optimized in terms of supply current using a high quality resonator with a small Rm value.

Refer to crystal manufacturer for more details.

3. Guaranteed by design. Not tested in production.

4. tSU(LSE) is the startup time measured from the moment it is enabled (by software) to a stabilized 32.768 kHz oscillation.

This value is measured for a standard crystal resonator and it can vary significantly with the crystal manufacturer.

STM8L052R8 Electrical parameters

Doc ID023337 Rev 2 77/109

Figure 17. LSE oscillator circuit diagram

Internal clock sources

Subject to general operating conditions for VDD, and TA.

High speed internal RC oscillator (HSI)

In the following table, data are based on characterization results, not tested in production,

unless otherwise specified.

OSC_OUT

OSC_IN

LSE

STM8

Resonator

Consumption

control

Resonator

Table 30. HSI oscillator characteristics

Symbol Parameter Conditions(1) Min. Typ. Max. Unit

fHSI Frequency VDD = 3.0 V 16 MHz

ACCHSI

Accuracy of HSI

oscillator (factory

calibrated)

VDD = 3.0 V, TA = 25 °C -1 (2) 1 (2) %

1.8 V ≤ VDD ≤ 3.6 V,

-40 °C ≤ TA ≤ 85 °C -5 5 %

TRIM HSI user trimming

step(3)

Trimming code ≠ multiple of 16 0.4 0.7 %

Trimming code = multiple of 16 ± 1.5 %

tsu(HSI)

HSI oscillator setup

time (wakeup time) 3.7 6 (4) µs

IDD(HSI)

HSI oscillator power

consumption 100 140(4) µA

1. VDD = 3.0 V, TA = -40 to 85 °C unless otherwise specified.

2. Tested in production.

3. The trimming step differs depending on the trimming code. It is usually negative on the codes which are multiples of 16

(0x00, 0x10, 0x20, 0x30...0xE0). Refer to the AN3101 “STM8L15x internal RC oscillator calibration” application note for

more details.

4. Guaranteed by design, not tested in production

Electrical parameters STM8L052R8

78/109 Doc ID023337 Rev 2

Figure 18. Typical HSI frequency vs. VDD

Low speed internal RC oscillator (LSI)

In the following table, data are based on characterization results, not tested in production.

Table 31. LSI oscillator characteristics

Symbol Parameter Conditions(1)

1. VDD = 1.8 V to 3.6 V, TA = -40 to 85 °C unless otherwise specified.

Min. Typ. Max. Unit

fLSI Frequency 26 38 56 kHz

tsu(LSI) LSI oscillator wakeup time 200(2)

2. Guaranteed by Design, not tested in production.

µs

D(LSI)

LSI oscillator frequency

drift(3)

3. This is a deviation for an individual part, once the initial frequency has been measured.

0 °C ≤ TA ≤ 85 °C -12 11 %

13.0

13.5

14.0

14.5

15.0

15.5

16.0

16.5

17.0

17.5

18.0

1.8 1.95 2.1 2.25 2.4 2.55 2.7 2.85 3 3.15 3.3 3.45 3.6

VDD [V]

HSI

frequency

[MHz]

-40°C

25°C

85°C

ai18218V3

STM8L052R8 Electrical parameters

Doc ID023337 Rev 2 79/109

Figure 19. Typical LSI clock source frequency vs. VDD

8.3.5 Memory characteristics

TA = -40 to 85 °C unless otherwise specified.

0.03

0.032

0.034

0.036

0.038

0.04

1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6

RC32K Check (MHz)

VDD (V)

25°C

85°C

-40°C

MS19116V2

Table 32. RAM and hardware registers

Symbol Parameter Conditions Min. Typ. Max. Unit

VRM Data retention mode (1)

1. Minimum supply voltage without losing data stored in RAM (in Halt mode or under Reset) or in hardware

registers (only in Halt mode). Guaranteed by characterization, not tested in production.

Halt mode (or Reset) 1.8 V

Electrical parameters STM8L052R8

80/109 Doc ID023337 Rev 2

Flash memory

Table 33. Flash program and data EEPROM memory

Symbol Parameter Conditions Min. Typ. Max.

(1) Unit

VDD

Operating voltage

(all modes, read/write/erase) fSYSCLK = 16 MHz 1.8 3.6 V

tprog

Programming time for 1 or 128 bytes (block)

erase/write cycles (on programmed byte) 6ms

Programming time for 1 to 128 bytes (block)

write cycles (on erased byte) 3ms

Iprog Programming/ erasing consumption TA=+25 °C, VDD = 3.0 V 0.7 mA

TA=+25 °C, VDD = 1.8 V

tRET(2)

Data retention (program memory) after 100

erase/write cycles at TA=−40 to +85 °C TRET=+85 °C 30(1)

years

Data retention (data memory) after 100000

erase/write cycles at TA=−40 to +85 °C TRET=+85 °C 30(1)

NRW (3)

Erase/write cycles (program memory)

TA=−40 to +85 °C

100(1) cycles

Erase/write cycles (data memory) 100(1)

(4) kcycles

1. Data based on characterization results, not tested in production.

2. Conforming to JEDEC JESD22a117

3. The physical granularity of the memory is 4 bytes, so cycling is performed on 4 bytes even when a write/erase operation

addresses a single byte.

4. Data based on characterization performed on the whole data memory.

STM8L052R8 Electrical parameters

Doc ID023337 Rev 2 81/109

8.3.6 I/O current injection characteristics

As a general rule, current injection to the I/O pins, due to external voltage below VSS or

above VDD (for standard pins) should be avoided during normal product operation. However,

in order to give an indication of the robustness of the microcontroller in cases when

abnormal injection accidentally happens, susceptibility tests are performed on a sample

basis during device characterization.

Functional susceptibility to I/O current injection

While a simple application is executed on the device, the device is stressed by injecting

current into the I/O pins programmed in floating input mode. While current is injected into the

I/O pin, one at a time, the device is checked for functional failures.

The failure is indicated by an out of range parameter: ADC error, out of spec current

injection on adjacent pins or other functional failure (for example reset, oscillator frequency

deviation, LCD levels, etc.).

The test results are given in the following table.

8.3.7 I/O port pin characteristics

General characteristics

Subject to general operating conditions for VDD and TA unless otherwise specified. All

unused pins must be kept at a fixed voltage: using the output mode of the I/O for example or

an external pull-up or pull-down resistor.

Table 34. I/O current injection susceptibility

Symbol Description

Functional susceptibility

Unit

Negative

injection

Positive

injection

IINJ

Injected current on true open-drain pins -5 +0

mAInjected current on all 5 V tolerant (FT) pins -5 +0

Injected current on any other pin -5 +5

Electrical parameters STM8L052R8

82/109 Doc ID023337 Rev 2

Table 35. I/O static characteristics

Symbol Parameter Conditions(1) Min. Typ. Max. Unit

VIL Input low level voltage(2)

Input voltage on true

open-drain pins (PC0

and PC1)

Vss-0.3 0.3 x VDD

VInput voltage on five-

volt tolerant (FT) pins Vss-0.3 0.3 x VDD

Input voltage on any

other pin Vss-0.3 0.3 x VDD

VIH Input high level voltage (2)

Input voltage on true

open-drain pins (PC0

and PC1)

with VDD < 2 V

0.70 x VDD

5.2

Input voltage on true

open-drain pins (PC0

and PC1)

with VDD ≥ 2 V

5.5

Input voltage on five-

volt tolerant (FT) pins

with VDD < 2 V

0.70 x VDD

5.2

Input voltage on five-

volt tolerant (FT) pins

with VDD ≥ 2 V

5.5

Input voltage on any

other pin 0.70 x VDD VDD+0.3

Vhys Schmitt trigger voltage hysteresis (3) Standard I/Os 200 mV

True open drain I/Os 200

Ilkg Input leakage current (4)

VSS≤ VIN≤ VDD

Standard I/Os --50

(5)

VSS≤ VIN≤ VDD

True open drain I/Os - - 200(5)

VSS≤ VIN≤ VDD

PA0 with high sink LED

driver capability

- - 200(5)

RPU Weak pull-up equivalent resistor(2)(6) VIN=VSS 30 45 60 kΩ

CIO I/O pin capacitance 5 pF

1. VDD = 3.0 V, TA = -40 to 85 °C unless otherwise specified.

2. Data based on characterization results, not tested in production.

3. Hysteresis voltage between Schmitt trigger switching levels. Based on characterization results, not tested.

4. The max. value may be exceeded if negative current is injected on adjacent pins.

5. Not tested in production.

6. RPU pull-up equivalent resistor based on a resistive transistor (corresponding IPU current characteristics described in

Figure 23).

STM8L052R8 Electrical parameters

Doc ID023337 Rev 2 83/109

Figure 20. Typical VIL and VIH vs. VDD (standard I/Os)

Figure 21. Typical VIL and VIH vs. VDD (true open drain I/Os)

Figure 22. Typical pull-up resistance RPU vs. VDD with VIN=VSS

0.5

1.5

2.5

1.8 2.1 2.6 3.1 3.6

VDD [V]

and V

[V]

-40°C

25°C

85°C

ai18220V3

0.5

1.5

2.5

1.8 2.1 2.6 3.1 3.6

VDD [V]

and V

[V]

-40°C

25°C

85°C

ai18221V2

1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6

VDD [V]

Pull-Up resistance [kΩ

]

-40°C

25°C

85°C

ai18222V2

Electrical parameters STM8L052R8

84/109 Doc ID023337 Rev 2

Figure 23. Typical pull-up current Ipu vs. VDD with VIN=VSS

Output driving current

Subject to general operating conditions for VDD and TA unless otherwise specified.

Table 36. Output driving current (high sink ports)

I/O

Type Symbol Parameter Conditions Min. Max. Unit

Standard

VOL (1)

1. The IIO current sunk must always respect the absolute maximum rating specified in Table 13 and the sum

of IIO (I/O ports and control pins) must not exceed IVSS.

Output low level voltage for an I/O pin

IIO = +2 mA,

VDD = 3.0 V 0.45 V

IIO = +2 mA,

VDD = 1.8 V 0.45 V

IIO = +10 mA,

VDD = 3.0 V 0.7 V

VOH (2)

2. The IIO current sourced must always respect the absolute maximum rating specified in Table 13 and the

sum of IIO (I/O ports and control pins) must not exceed IVDD.

Output high level voltage for an I/O pin

IIO = -2 mA,

VDD = 3.0 V VDD-0.45 V

IIO = -1 mA,

VDD = 1.8 V VDD-0.45 V

IIO = -10 mA,

VDD = 3.0 V VDD-0.7 V

100

120

1.8 1.95 2.1 2.25 2.4 2.55 2.7 2.85 3 3.15 3.3 3.45 3.6

VDD [V]

Pull-Up current [μA]

-40°C

25°C

85°C

ai18223V2

STM8L052R8 Electrical parameters

Doc ID023337 Rev 2 85/109

Table 37. Output driving current (true open drain ports)

I/O

Type Symbol Parameter Conditions Min. Max. Unit

Open drain

VOL (1) Output low level voltage for an I/O pin

IIO = +3 mA,

VDD = 3.0 V 0.45

IIO = +1 mA,

VDD = 1.8 V 0.45

1. The IIO current sunk must always respect the absolute maximum rating specified in Table 13 and the sum

of IIO (I/O ports and control pins) must not exceed IVSS.

Table 38. Output driving current (PA0 with high sink LED driver capability)

I/O

Type Symbol Parameter Conditions Min. Max. Unit

VOL (1) Output low level voltage for an I/O pin IIO = +20 mA,

VDD = 2.0 V 0.45 V

1. The IIO current sunk must always respect the absolute maximum rating specified in Table 13 and the sum

of IIO (I/O ports and control pins) must not exceed IVSS.

Figure 24. Typical VOL @ VDD = 3.0 V (high

sink ports)

Figure 25. Typical VOL @ VDD = 1.8 V (high

sink ports)

0.25

0.5

0.75

02468101214161820

IOL [mA]

[V]

-40°C

25°C

85°C

ai18226V2

0.1

0.2

0.3

0.4

0.5

0.6

0.7

012345678

IOL [mA]

[V]

-40°C

25°C

85°C

ai18227V2

Figure 26. Typical VOL @ VDD = 3.0 V (true

open drain ports)

Figure 27. Typical VOL @ VDD = 1.8 V (true

open drain ports)

ai18228V2

0.1

0.2

0.3

0.4

0.5

01234567

IOL [mA]

[V]

-40°C

25°C

85°C

0.1

0.2

0.3

0.4

0.5

01234567

IOL [mA]

[V]

-40°C

25°C

85°C

BJ7

Electrical parameters STM8L052R8

86/109 Doc ID023337 Rev 2

NRST pin

Subject to general operating conditions for VDD and TA unless otherwise specified.

Figure 28. Typical VDD - VOH @ VDD = 3.0 V

(high sink ports)

Figure 29. Typical VDD - VOH @ VDD = 1.8 V

(high sink ports)

0.25

0.5

0.75

1.25

1.5

1.75

0 2 4 6 8 101214161820

IOH [mA]

- V

[V]

-40°C

25°C

85°C

ai12830V2

0.1

0.2

0.3

0.4

0.5

01234567

IOH [mA]

- V

[V]

-40°C

25°C

85°C

BJ7

Table 39. NRST pin characteristics

Symbol Parameter Conditions Min. Typ. Max. Unit

VIL(NRST) NRST input low level voltage (1) VSS 0.8

VIH(NRST) NRST input high level voltage (1) 1.4 VDD

VOL(NRST) NRST output low level voltage (1)

IOL = 2 mA

for 2.7 V ≤ VDD ≤ 3.6

V0.4

IOL = 1.5 mA

for VDD < 2.7 V

VHYST NRST input hysteresis(3) 10%VDD

(2) mV

RPU(NRST)

NRST pull-up equivalent

resistor(1) 30 45 60 kΩ

VF(NRST) NRST input filtered pulse (3) 50

VNF(NRST) NRST input not filtered pulse (3) 300

1. Data based on characterization results, not tested in production.

2. 200 mV min.

3. Data guaranteed by design, not tested in production.

STM8L052R8 Electrical parameters

Doc ID023337 Rev 2 87/109

Figure 30. Typical NRST pull-up resistance RPU vs. VDD

Figure 31. Typical NRST pull-up current Ipu vs. VDD

The reset network shown in Figure 32 protects the device against parasitic resets. The user

must ensure that the level on the NRST pin can go below the VIL max. level specified in

Ta bl e 3 9 . Otherwise the reset is not taken into account internally. For power consumption-

sensitive applications, the capacity of the external reset capacitor can be reduced to limit the

charge/discharge current. If the NRST signal is used to reset the external circuitry, the user

must pay attention to the charge/discharge time of the external capacitor to meet the reset

timing conditions of the external devices. The minimum recommended capacity is 10 nF.

1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6

VDD [V]

Pull-up

resistance

[kΩ

]

-40°C

25°C

85°C

ai18224V2

ai18225V2

100

120

1.8 1.95 2.1 2.25 2.4 2.55 2.7 2.85 3 3.15 3.3 3.45 3.6

VDD [V]

Pull-Up current [μA]

-40°C

25°C

85°C

Electrical parameters STM8L052R8

88/109 Doc ID023337 Rev 2

Figure 32. Recommended NRST pin configuration

EXTERNAL

RESET

CIRCUIT

STM8L

Filter

RPU

VDD

INTERNAL RESET

RSTIN

0.1 µF

STM8L052R8 Electrical parameters
Doc ID023337 Rev 2 89/109
8.3.8 Communication interfaces
SPI1 - Serial peripheral interface
Unless otherwise specified, the parameters given in Ta bl e 4 0  are derived from tests 
performed under ambient temperature, fSYSCLK frequency and VDD supply voltage 
conditions summarized in Section 8.3.1. Refer to I/O port characteristics for more details on 
the input/output alternate function characteristics (NSS, SCK, MOSI, MISO).
         
Table 40. SPI1 characteristics 
Symbol Parameter Conditions(1) Min. Max. Unit
fSCK
1/tc(SCK)
SPI1 clock frequency Master mode  0 8
MHz
Slave mode 0 8
tr(SCK)
tf(SCK)
SPI1 clock rise and fall 
time Capacitive load: C = 30 pF - 30 ns
tsu(NSS)(2) NSS setup time  Slave mode 4 x 1/fSYSCLK -
th(NSS)(2) NSS hold time Slave mode 80 -
tw(SCKH)(2)
tw(SCKL)(2) SCK high and low time Master mode, 
fMASTER = 8 MHz, fSCK= 4 MHz 105 145
tsu(MI) (2)
tsu(SI)(2) Data input setup time Master mode 30 -
Slave mode 3 -
th(MI) (2)
th(SI)(2) Data input hold time Master mode 15 -
Slave mode 0 -
ta(SO)(2)(3) Data output access time Slave mode - 3x 1/fSYSCLK
tdis(SO)(2)(4) Data output disable time Slave mode 30 -
tv(SO) (2) Data output valid time Slave mode (after enable edge) - 60
tv(MO)(2) Data output valid time Master mode (after enable 
edge) -20
th(SO)(2)
Data output hold time
Slave mode (after enable edge) 15 -
th(MO)(2) Master mode (after enable 
edge) 1-
1. Parameters are given by selecting 10 MHz I/O output frequency.
2. Values based on design simulation and/or characterization results, and not tested in production.
3. Min. time is for the minimum time to drive the output and max. time is for the maximum time to validate the data.
4. Min. time is for the minimum time to invalidate the output and max. time is for the maximum time to put the data in Hi-Z.

Electrical parameters STM8L052R8

90/109 Doc ID023337 Rev 2

Figure 33. SPI1 timing diagram - slave mode and CPHA=0

Figure 34. SPI1 timing diagram - slave mode and CPHA=1(1)

1. Measurement points are done at CMOS levels: 0.3VDD and 0.7VDD.

ai14134

SCK Input

CPHA= 0

MOSI

INPUT

MISO

OUT P UT

CPHA= 0

MS B O UT

MSB IN

BI T6 OU T

LSB IN

LSB OUT

CPOL=0

CPOL=1

BIT1 IN

NSS input

tSU(NSS) tc(SCK) th(NSS)

ta(SO)

tw(SCKH)

tw(SCKL)

tv(SO) th(SO) tr(SCK)

tf(SCK)

tdis(SO)

tsu(SI)

th(SI)

ai14135

SCK Input

CPHA=1

MOSI

INPUT

MISO

OUT P UT

CPHA=1

MS B O UT

MSB IN

BI T6 OU T

LSB IN

LSB OUT

CPOL=0

CPOL=1

BIT1 IN

tSU(NSS) tc(SCK) th(NSS)

ta(SO)

tw(SCKH)

tw(SCKL)

tv(SO) th(SO) tr(SCK)

tf(SCK)

tdis(SO)

tsu(SI) th(SI)

NSS input

STM8L052R8 Electrical parameters

Doc ID023337 Rev 2 91/109

Figure 35. SPI1 timing diagram - master mode(1)

1. Measurement points are done at CMOS levels: 0.3VDD and 0.7VDD.

ai14136

SCK Input

CPHA= 0

MOSI

OUTUT

MISO

INP UT

CPHA= 0

MS BIN

M SB OUT

BI T6 IN

LSB OUT

LSB IN

CPOL=0

CPOL=1

B I T1 OUT

NSS input

tc(SCK)

tw(SCKH)

tw(SCKL)

tr(SCK)

tf(SCK)

th(MI)

High

SCK Input

CPHA=1

CPOL=0

CPOL=1

tsu(MI)

tv(MO) th(MO)

Electrical parameters STM8L052R8

92/109 Doc ID023337 Rev 2

I2C - Inter IC control interface

Subject to general operating conditions for VDD, fSYSCLK, and TA unless otherwise specified.

The STM8L I2C interface (I2C1) meets the requirements of the Standard I2C communication

protocol described in the following table with the restriction mentioned below:

Refer to I/O port characteristics for more details on the input/output alternate function

characteristics (SDA and SCL).

Note: For speeds around 200 kHz, the achieved speed can have a

5% tolerance.

For other speed ranges, the achieved speed can have a

2% tolerance.

The above variations depend on the accuracy of the external components used.

Table 41. I2C characteristics

Symbol Parameter

Standard mode I2CFast mode I

2C(1)

1. fSYSCLK must be at least equal to 8 MHz to achieve max fast I2C speed (400 kHz).

Unit

Min.(2)

2. Data based on standard I2C protocol requirement, not tested in production.

Max. (2) Min. (2) Max. (2)

tw(SCLL) SCL clock low time 4.7 1.3

μs

tw(SCLH) SCL clock high time 4.0 0.6

tsu(SDA) SDA setup time 250 100

th(SDA) SDA data hold time 0 0 900

tr(SDA)

tr(SCL)

SDA and SCL rise time 1000 300

tf(SDA)

tf(SCL)

SDA and SCL fall time 300 300

th(STA) START condition hold time 4.0 0.6

μs

tsu(STA) Repeated START condition setup

time 4.7 0.6

tsu(STO) STOP condition setup time 4.0 0.6 μs

tw(STO:STA) STOP to START condition time (bus

free) 4.7 1.3 μs

CbCapacitive load for each bus line 400 400 pF

STM8L052R8 Electrical parameters

Doc ID023337 Rev 2 93/109

Figure 36. Typical application with I2C bus and timing diagram 1)

1. Measurement points are done at CMOS levels: 0.3 x VDD and 0.7 x VDD

REPEATED START

START

STOP

START

tf(SDA) tr(SDA) tsu(SDA) th(SDA)

tf(SCL)

tr(SCL)

tw(SCLL)

tw(SCLH)

th(STA) tsu(STO)

tsu(STA) tw(STO:STA)

SDA

SCL

4.7kΩSDA

STM8L

SCL

VDD

100Ω

VDD

4.7kΩ

I2CBUS

Electrical parameters STM8L052R8

94/109 Doc ID023337 Rev 2

8.3.9 LCD controller

In the following table, data are guaranteed by Design, not tested in production.

VLCD external capacitor

The application can achieve a stabilized LCD reference voltage by connecting an external

capacitor CEXT to the VLCD pin. CEXT is specified in Ta b l e 4 2 .

Table 42. LCD characteristics

Symbol Parameter Min. Typ. Max. Unit

VLCD LCD external voltage 3.6

VLCD0 LCD internal reference voltage 0 2.6

VLCD1 LCD internal reference voltage 1 2.7

VLCD2 LCD internal reference voltage 2 2.8

VLCD3 LCD internal reference voltage 3 3.0

VLCD4 LCD internal reference voltage 4 3.1

VLCD5 LCD internal reference voltage 5 3.2

VLCD6 LCD internal reference voltage 6 3.4

VLCD7 LCD internal reference voltage 7 3.5

CEXT VLCD external capacitance 0.1 1 2 µF

IDD

Supply current(1) at VDD = 1.8 V

1. LCD enabled with 3 V internal booster (LCD_CR1 = 0x08), 1/4 duty, 1/3 bias, division ratio= 64, all pixels

active, no LCD connected.

3µA

Supply current(1) at VDD = 3 V 3

RHN(2)

2. RHN is the total high value resistive network.

High value resistive network (low drive) 6.6 MΩ

RLN(3)

3. RLN is the total low value resistive network.

Low value resistive network (high drive) 240 kΩ

V33 Segment/Common higher level voltage VLCDx

V34 Segment/Common 3/4 level voltage 3/4VLCDx

V23 Segment/Common 2/3 level voltage 2/3VLCDx

V12 Segment/Common 1/2 level voltage 1/2VLCDx

V13 Segment/Common 1/3 level voltage 1/3VLCDx

V14 Segment/Common 1/4 level voltage 1/4VLCDx

V0Segment/Common lowest level voltage 0

STM8L052R8 Electrical parameters

Doc ID023337 Rev 2 95/109

8.3.10 Embedded reference voltage

In the following table, data are based on characterization results, not tested in production,

unless otherwise specified.

Table 43. Reference voltage characteristics

Symbol Parameter Conditions Min. Typ. Max. Unit

IREFINT

Internal reference voltage

consumption 1.4 µA

TS_VREFINT(1)(2) ADC sampling time when reading the

internal reference voltage 510 µs

IBUF(1) Internal reference voltage buffer

consumption (used for ADC) 13.5 25 µA

VREFINT out Reference voltage output 1.202

(3) 1.224 1.242

(3) V

ILPBUF(1)

Internal reference voltage low power

buffer consumption (used for

comparators or output)

730 1200 nA

IREFOUT(1)(4) Buffer output current 1 µA

CREFOUT Reference voltage output load 50 pF

tVREFINT(1) Internal reference voltage startup

time 23 ms

tBUFEN(1)(2) Internal reference voltage buffer

startup time once enabled 10 µs

STABVREFINT

Stability of VREFINT over temperature -40 °C ≤ TA ≤ 85 °C 20 50 ppm/°C

Stability of VREFINT over temperature 0 °C ≤ TA ≤ 50 °C 20 ppm/°C

STABVREFINT Stability of VREFINT after 1000 hours TBD ppm

1. Guaranteed by design, not tested in production

2. Defined when ADC output reaches its final value ±1/2LSB

3. Tested in production at VDD = 3 V ±10 mV.

4. To guarantee less than 1% VREFOUT deviation

Electrical parameters STM8L052R8

96/109 Doc ID023337 Rev 2

8.3.11 12-bit ADC1 characteristics

In the following table, data are guaranteed by design, not tested in production.

Table 44. ADC1 characteristics

Symbol Parameter Conditions Min. Typ. Max. Unit

VDDA Analog supply voltage 1.8 3.6 V

VREF+ Reference supply

voltage

2.4 V ≤ VDDA≤ 3.6 V 2.4 VDDA V

1.8 V≤ VDDA≤ 2.4 V VDDA V

VREF- Lower reference voltage VSSA V

IVDDA

Current on the VDDA

input pin 1000 1450 µA

IVREF+

Current on the VREF+

input pin 400

700

(peak)(1) µA

450

(average)(1) µA

VAIN Conversion voltage

range 0(2) VREF+

TATemperature range -40 85 °C

RAIN External resistance on

VAIN

on PF0/1/2/3 fast

channels 50(3) kΩ

on all other channels

CADC Internal sample and

hold capacitor

on PF0/1/2/3 fast

channels 16 pF

on all other channels

fADC ADC sampling clock

frequency

2.4 V≤ VDDA≤ 3.6 V

without zooming 0.320 16 MHz

1.8 V≤ VDDA≤ 2.4 V

with zooming 0.320 8 MHz

fCONV 12-bit conversion rate

VAIN on PF0/1/2/3 fast

channels 1(3)(4) MHz

VAIN on all other

channels 760(3)(4) kHz

fTRIG External trigger

frequency tconv 1/fADC

tLAT External trigger latency 3.5 1/fSYSCLK

STM8L052R8 Electrical parameters

Doc ID023337 Rev 2 97/109

tSSampling time

VAIN PF0/1/2/3 fast

channels

VDDA < 2.4 V

0.43(3)(4) µs

VAIN PF0/1/2/3 fast

channels

2.4 V ≤ VDDA≤ 3.6 V

0.22(3)(4) µs

VAIN on slow channels

VDDA < 2.4 V 0.86(3)(4) µs

VAIN on slow channels

2.4 V ≤ VDDA≤ 3.6 V 0.41(3)(4) µs

tconv 12-bit conversion time 12 + tS 1/fADC

16 MHz 1(3) µs

tWKUP Wakeup time from OFF

state 3µs

tIDLE(5) Time before a new

conversion ∞s

tVREFINT

Internal reference

voltage startup time

refer to

Ta bl e 4 3 ms

1. The current consumption through VREF is composed of two parameters:

- one constant (max 300 µA)

- one variable (max 400 µA), only during sampling time + 2 first conversion pulses.

So, peak consumption is 300+400 = 700 µA and average consumption is 300 + [(4 sampling + 2) /16] x 400 = 450 µA at

1Msps

2. VREF- must be tied to ground.

3. Minimum sampling and conversion time is reached for maximum RAIN= 0.5 kΩ..

4. Value obtained for continuous conversion on fast channel.

5. The time between 2 conversions, or between ADC ON and the first conversion must be lower than tIDLE.

Table 44. ADC1 characteristics (continued)

Symbol Parameter Conditions Min. Typ. Max. Unit

Electrical parameters STM8L052R8

98/109 Doc ID023337 Rev 2

In the following three tables, data are guaranteed by characterization result, not tested in

production.

Table 45. ADC1 accuracy with VDDA = 3.3 V to 2.5 V

Symbol Parameter Conditions Typ. Max. Unit

DNL Differential non linearity

fADC = 16 MHz 1 1.6

LSB

fADC = 8 MHz 1 1.6

fADC = 4 MHz 1 1.5

INL Integral non linearity

fADC = 16 MHz 1.2 2

fADC = 8 MHz 1.2 1.8

fADC = 4 MHz 1.2 1.7

TUE Total unadjusted error

fADC = 16 MHz 2.2 3.0

fADC = 8 MHz 1.8 2.5

fADC = 4 MHz 1.8 2.3

Offset Offset error

fADC = 16 MHz 1.5 2

LSB

fADC = 8 MHz 1 1.5

fADC = 4 MHz 0.7 1.2

Gain Gain error

fADC = 16 MHz

11.5fADC = 8 MHz

fADC = 4 MHz

Table 46. ADC1 accuracy with VDDA = 2.4 V to 3.6 V

Symbol Parameter Typ. Max. Unit

DNL Differential non linearity 1 2 LSB

INL Integral non linearity 1.7 3 LSB

TUE Total unadjusted error 2 4 LSB

Offset Offset error 1 2 LSB

Gain Gain error 1.5 3 LSB

Table 47. ADC1 accuracy with VDDA = VREF+ = 1.8 V to 2.4 V

Symbol Parameter Typ. Max. Unit

DNL Differential non linearity 1 2 LSB

INL Integral non linearity 2 3 LSB

TUE Total unadjusted error 3 5 LSB

Offset Offset error 2 3 LSB

Gain Gain error 2 3 LSB

STM8L052R8 Electrical parameters

Doc ID023337 Rev 2 99/109

Figure 37. ADC1 accuracy characteristics

Figure 38. Typical connection diagram using the ADC

1. Refer to Ta b l e 4 4 for the values of RAIN and CADC.

2. Cparasitic represents the capacitance of the PCB (dependent on soldering and PCB layout quality) plus the

pad capacitance (roughly 7 pF). A high Cparasitic value will downgrade conversion accuracy. To remedy

this, fADC should be reduced.

General PCB design guidelines

Power supply decoupling should be performed as shown in Figure 39 or Figure 40,

depending on whether VREF+ is connected to VDDA or not. Good quality ceramic 10 nF

capacitors should be used. They should be placed as close as possible to the chip.

1LSB

IDEAL

(1) Example of an actual transfer curve

(2) The ideal transfer curve

(3) End point correlation line

ET=Total Unadjusted Error: maximum deviation

between the actual and the ideal transfer curves.

EO=Offset Error: deviation between the first actual

transition and the first ideal one.

EG=Gain Error: deviation between the last ideal

transition and the last actual one.

ED=Differential Linearity Error: maximum deviation

between actual steps and the ideal one.

EL=Integral Linearity Error: maximum deviation

between any actual transition and the end point

correlation line.

4095

4094

4093

1234567 4093 4094 4095 4096

(1)

(2)

(3)

VDDA

VSSA

ai14395b

VREF+

4096 (or depending on package)]

VDDA

4096

[1LSBIDEAL =

ai17090e

STM8L05xxx

VDD

AINx

±50 nA

0.6 V

RAIN(1)

Cparasitic

VAIN

0.6 V

RADC

ADC(1)

12-bit

converter

Sample and hold ADC

converter

Electrical parameters STM8L052R8

100/109 Doc ID023337 Rev 2

Figure 39. Power supply and reference decoupling (VREF+ not connected to VDDA)

Figure 40. Power supply and reference decoupling (VREF+ connected to VDDA)

VREF+

TM8L

STM8L

VDDA

VSSA/V REF-

1 μF // 10 nF

Supply

External

reference

ai17031b

VREF+/VDDA

STM8L

1 μF // 10 nF

VREF–/VSSA

ai17032b

Supply

STM8L052R8 Electrical parameters

Doc ID023337 Rev 2 101/109

8.3.12 EMC characteristics

Susceptibility tests are performed on a sample basis during product characterization.

Functional EMS (electromagnetic susceptibility)

Based on a simple running application on the product (toggling 2 LEDs through I/O ports),

the product is stressed by two electromagnetic events until a failure occurs (indicated by the

LEDs).

●ESD: Electrostatic discharge (positive and negative) is applied on all pins of the device

until a functional disturbance occurs. This test conforms with the IEC 61000 standard.

●FTB: A burst of fast transient voltage (positive and negative) is applied to VDD and VSS

through a 100 pF capacitor, until a functional disturbance occurs. This test conforms

with the IEC 61000 standard.

A device reset allows normal operations to be resumed. The test results are given in the

table below based on the EMS levels and classes defined in application note AN1709.

Designing hardened software to avoid noise problems

EMC characterization and optimization are performed at component level with a typical

application environment and simplified MCU software. It should be noted that good EMC

performance is highly dependent on the user application and the software in particular.

Therefore it is recommended that the user applies EMC software optimization and

prequalification tests in relation with the EMC level requested for his application.

Prequalification trials:

Most of the common failures (unexpected reset and program counter corruption) can be

reproduced by manually forcing a low state on the NRST pin or the Oscillator pins for 1

second.

To complete these trials, ESD stress can be applied directly on the device, over the range of

specification values. When unexpected behavior is detected, the software can be hardened

to prevent unrecoverable errors occurring (see application note AN1015).

Electromagnetic interference (EMI)

Based on a simple application running on the product (toggling 2 LEDs through the I/O

ports), the product is monitored in terms of emission. This emission test is in line with the

norm IEC61967-2 which specifies the board and the loading of each pin.

Table 48. EMS data

Symbol Parameter Conditions Level/

Class

VFESD

Voltage limits to be applied on

any I/O pin to induce a functional

disturbance

VDD = 3.3 V, TA = +25 °C,

fCPU= 16 MHz,

conforms to IEC 61000

VEFTB

Fast transient voltage burst limits

to be applied through 100 pF on

VDD and VSS pins to induce a

functional disturbance

VDD = 3.3 V, TA = +25 °C,

fCPU = 16 MHz,

conforms to IEC 61000

Using HSI 4A

Using HSE 2B

Electrical parameters STM8L052R8

102/109 Doc ID023337 Rev 2

Absolute maximum ratings (electrical sensitivity)

Based on two different tests (ESD and LU) using specific measurement methods, the

product is stressed in order to determine its performance in terms of electrical sensitivity.

For more details, refer to the application note AN1181.

Electrostatic discharge (ESD)

Electrostatic discharges (a positive then a negative pulse separated by 1 second) are

applied to the pins of each sample according to each pin combination. The sample size

depends on the number of supply pins in the device (3 parts*(n+1) supply pin). Two models

can be simulated: human body model and charge device model. This test conforms to the

JESD22-A114A/A115A standard.

Static latch-up

●LU: 3 complementary static tests are required on 10 parts to assess the latch-up

performance. A supply overvoltage (applied to each power supply pin) and a current

injection (applied to each input, output and configurable I/O pin) are performed on each

sample. This test conforms to the EIA/JESD 78 IC latch-up standard. For more details,

refer to the application note AN1181.

Table 49. EMI data (1)

1. Not tested in production.

Symbol Parameter Conditions Monitored

frequency band

Max vs.

Unit

16 MHz

SEMI Peak level

VDD = 3.6 V,

TA = +25 °C,

LQFP80

conforming to

IEC61967-2

0.1 MHz to 30 MHz 10

dBμV30 MHz to 130 MHz 4

130 MHz to 1 GHz 1

SAE EMI Level 1.5 -

Table 50. ESD absolute maximum ratings

Symbol Ratings Conditions Maximum

value (1)

1. Data based on characterization results, not tested in production.

Unit

VESD(HBM) Electrostatic discharge voltage

(human body model) TA = +25 °C

2000

VESD(CDM) Electrostatic discharge voltage

(charge device model) 750

Table 51. Electrical sensitivities

Symbol Parameter Class

LU Static latch-up class II

STM8L052R8 Electrical parameters

Doc ID023337 Rev 2 103/109

8.4 Thermal characteristics

The maximum chip junction temperature (TJmax) must never exceed the values given in

Table 15: General operating conditions on page 58.

The maximum chip-junction temperature, TJmax, in degree Celsius, may be calculated using

the following equation:

TJmax = TAmax + (PDmax x ΘJA)

Where:

●TAmax is the maximum ambient temperature in °C

●ΘJA is the package junction-to-ambient thermal resistance in °C/W

●PDmax is the sum of PINTmax and PI/Omax (PDmax = PINTmax + PI/Omax)

●PINTmax is the product of IDD and VDD, expressed in Watts. This is the maximum chip

internal power.

●PI/Omax represents the maximum power dissipation on output pins

Where:

PI/Omax = Σ (VOL*IOL) + Σ((VDD-VOH)*I OH),

taking into account the actual VOL/IOL and VOH/IOH of the I/Os at low and high level in

the application.

Table 52. Thermal characteristics(1)

1. Thermal resistance is based on JEDEC JESD51-2 with 4-layer PCB in a natural convection environment.

Symbol Parameter Value Unit

ΘJA

Thermal resistance junction-ambient

LQFP 64- 10 x 10 mm 48 °C/W

Package characteristics STM8L052R8

104/109 Doc ID023337 Rev 2

9 Package characteristics

9.1 Package mechanical data

In order to meet environmental requirements, ST offers these devices in different grades of

ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®

specifications, grade definitions and product status are available at: www.st.com.

ECOPACK® is an ST trademark.

STM8L052R8 Package characteristics

Doc ID023337 Rev 2 105/109

Figure 41. LQFP64 – 10 x 10 mm, 64 pin low-profile quad flat package outline

1. Drawing is not to scale.

"

ccc $

E3 E1 E

116

Pin 1

MS19157V1

Table 53. LQFP64 – 10 x 10 mm, 64-pin low-profile quad flat package mechanical data

Symbol

millimeters inches(1)

Min Typ Max Min Typ Max

A 1.60 0.0630

A1 0.05 0.15 0.0020 0.0059

A2 1.35 1.40 1.45 0.0531 0.0551 0.0571

b 0.17 0.22 0.27 0.0067 0.0087 0.0106

c 0.09 0.20 0.0035 0.0079

D 12.00 0.4724

D1 10.00 0.3937

E 12.00 0.4724

E1 10.00 0.3937

e 0.50 0.0197

θ0° 3.5° 7° 0° 3.5° 7°

L 0.45 0.60 0.75 0.0177 0.0236 0.0295

L1 1.00 0.0394

Number of pins

N64

1. Values in inches are converted from mm and rounded to 4 decimal digits.

Package characteristics STM8L052R8

106/109 Doc ID023337 Rev 2

Figure 42. Recommended footprint

1. Dimensions are in millimeters.

3249

64 17

116

1.2

0.3

10.3

12.7

10.3

0.5

7.8

12.7

ai14909

STM8L052R8 Ordering information scheme

Doc ID023337 Rev 2 107/109

10 Ordering information scheme

For a list of available options (e.g. memory size, package) and orderable part numbers or for

further information on any aspect of this device, please go to www.st.com or contact the ST

Sales Office nearest to you.

Figure 43. Ordering information scheme

Example: STM8 L 052 R 8 T 6

Device family

STM8 microcontroller

Product type

L = Low power

Device subfamily

052: Devices with LCD

Pin count

R = 64 pins

Program memory size

8 = 64 Kbytes of Flash memory

Package

T = LQFP

Temperature range

6 = Industrial temperature range, –40 to 85 °C

Revision history STM8L052R8

108/109 Doc ID023337 Rev 2

11 Revision history

Table 54. Document revision history

Date Revision Changes

22-Jun-2012 1 Initial release.

27-May-2013 2

Modified 12-bit ADC up to 1 Msps/27 channels, Table 1: High density

value line STM8L05xxx low power device features and peripheral

counts and Section 3.9: Analog-to-digital converter.

STM8L052R8

Doc ID023337 Rev 2 109/109

Please Read Carefully:

Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the

right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any

time, without notice.

All ST products are sold pursuant to ST’s terms and conditions of sale.

Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no

liability whatsoever relating to the choice, selection or use of the ST products and services described herein.

No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this

document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products

or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such

third party products or services or any intellectual property contained therein.

UNLESS OTHERWISE SET FORTH IN ST’S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED

WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED

WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS

OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT.

ST PRODUCTS ARE NOT AUTHORIZED FOR USE IN WEAPONS. NOR ARE ST PRODUCTS DESIGNED OR AUTHORIZED FOR USE

IN: (A) SAFETY CRITICAL APPLICATIONS SUCH AS LIFE SUPPORTING, ACTIVE IMPLANTED DEVICES OR SYSTEMS WITH

PRODUCT FUNCTIONAL SAFETY REQUIREMENTS; (B) AERONAUTIC APPLICATIONS; (C) AUTOMOTIVE APPLICATIONS OR

ENVIRONMENTS, AND/OR (D) AEROSPACE APPLICATIONS OR ENVIRONMENTS. WHERE ST PRODUCTS ARE NOT DESIGNED

FOR SUCH USE, THE PURCHASER SHALL USE PRODUCTS AT PURCHASER’S SOLE RISK, EVEN IF ST HAS BEEN INFORMED IN

WRITING OF SUCH USAGE, UNLESS A PRODUCT IS EXPRESSLY DESIGNATED BY ST AS BEING INTENDED FOR “AUTOMOTIVE,

AUTOMOTIVE SAFETY OR MEDICAL” INDUSTRY DOMAINS ACCORDING TO ST PRODUCT DESIGN SPECIFICATIONS.

PRODUCTS FORMALLY ESCC, QML OR JAN QUALIFIED ARE DEEMED SUITABLE FOR USE IN AEROSPACE BY THE

CORRESPONDING GOVERNMENTAL AGENCY.

Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void

any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any

liability of ST.

ST and the ST logo are trademarks or registered trademarks of ST in various countries.

Information in this document supersedes and replaces all information previously supplied.

The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners.

STMicroelectronics group of companies

Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan -

Malaysia - Malta - Morocco - Philippines - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America

www.st.com

Mouser Electronics

Authorized Distributor

Click to View Pricing, Inventory, Delivery & Lifecycle Information:

STMicroelectronics:

STM8L052R8T6