PIC16F77T-I/PT - Microchip Technology

SSP MODULE

The PIC® microcontrollers you have received all exhibit

anomalous behavior in their Synchronous Serial Port

(SSP) modules, as described in this document. They

otherwise conform functionally to the descriptions pro-

vided in their respective Device Data Sheets and Ref-

erence Manuals, as amended by silicon release errata

for particular devices.

Users are encouraged to review the latest device data

sheets and errata available for additional information

concerning an individual device. These documents

may be obtained directly from the Microchip corporate

web site, at www.microchip.com.

Silicon Errata

These issues are expected to be resolved in future

silicon revisions of the designated parts.

The silicon issues identified in this “Silicon Errata” section

affect all silicon revisions of the following devices:

1. Module: I2C™ (Slave Mode)

In its current implementation, the module may fail

to correctly recognize certain Repeated Start

conditions. For this discussion, a Repeated Start is

defined as a Start condition presented to the bus

after an initial valid Start condition has been recog-

nized and the Start status bit (SSPSTAT<3>) has

been set and before a valid Stop condition is

received.

If a Repeated Start is not recognized, a loss of

synchronization between the Master and Slave

may occur; the condition may continue until the

module is reset. A NACK condition, generated by

the Slave for any reason, will not reset the module.

This failure has been observed only under two

circumstances:

• A Repeated Start occurs within the frame of a

data or address byte. The unexpected Start

condition may be erroneously interpreted as a

data bit, provided that the required conditions

for setup and hold times are met.

• A Repeated Start condition occurs between two

back-to-back slave address matches in the

same Slave, with the R/W bit set to Read (= 1)

in both cases. (This circumstance is regarded

as being unlikely in normal operation.)

Work around

A time-out routine should be used to monitor the

module’s operation. The timer is enabled upon the

receipt of a valid Start condition; if a time-out

occurs, the module is reset. The length of the time-

out period will vary from application to application

and will need to be determined by the user.

Two methods are suggested to reset the module:

1. Change the mode of the module to something

other than the desired mode by changing the set-

tings of bits, SSPM3:SSPM0 (SSPCON<3:0>);

then, change the bits back to the desired

configuration.

2. Disable the module by clearing the SSPEN bit

(SSPCON<5>); then, re-enable the module by

setting the bit.

Other methods may be available.

• PIC14000 • PIC16C923

• PIC16C62 • PIC16C924

• PIC16C62A • PIC16C925

• PIC16C62B • PIC16C926

• PIC16C63 • PIC16CR62

• PIC16C63A • PIC16CR63

• PIC16C64 • PIC16CR64

• PIC16C64A • PIC16CR65

• PIC16C65 • PIC16CR72

• PIC16C65A • PIC16CR72A

• PIC16C65B • PIC16F72

• PIC16C66 • PIC16F73

• PIC16C67 • PIC16F74

• PIC16C717 • PIC16F76

• PIC16C72 • PIC16F77

• PIC16C72A • PIC16F87

• PIC16C73 • PIC16F88

• PIC16C73A • PIC16F818

• PIC16C73B • PIC16F819

• PIC16C74 • PIC18F2331

• PIC16C74A • PIC18F2431

• PIC16C74B • PIC18F4331

• PIC16C76 • PIC18F4431

• PIC16C77

SSP Module Silicon/Data Sheet Errata

SSP MODULE

Clarifications/Corrections to the Data

Sheets

1. Module: SSP (SPI Mode)

The description of the operation of the CKE bit

(SSPSTAT<6>) is clarified. Please substitute the

description in Register 1, below, for all occurrences of

the existing text for the SSPSTAT register, bit 6 (new

text in bold).

2. Module: SSP (SPI Slave Mode)

The description of the operation of SPI Slave mode is

clarified as follows:

Before enabling the module in SPI Slave mode, the

state of the clock line (SCK) must match the polarity

selected for the Idle state. The clock line can be

observed by reading the SCK pin. The polarity of the

Idle state is determined by the CKP bit (SSPCON<4>).

This foregoing text should be added to the appropriate

subsections of the “SSP Module” chapter, entitled “SPI

Mode” and read in context with any discussions of SPI

Slave mode.

In the case of DS30234D, the text applies to both

implementations of SPI mode, as described in

Sections 11.2 and 11.3.

Note: This correction applies to the Data Sheets

for the following devices:

• PIC16C62B/72A (DS35008B)

• PIC16C63A/65B/73B/74B (DS30605C)

• PIC16C923/924 (DS30444E)

• PIC16C925/926 (DS39544A)

• PIC16F72 (DS39597B)

• PIC16F73/74/76/77 (DS30325B)

• PIC18F2331/2431/4331/4431

(DS39616B)

In addition, this clarification applies only to

the following devices in the PIC16C6X

Data Sheet (DS30234D):

•PIC16C66

•PIC16C67

In addition, this clarification applies only to

the following devices in the PIC16C7X

Data Sheet (DS30390E):

•PIC16C76

•PIC16C77

Any devices not explicitly listed in this

section do not implement SPI mode and

are not affected by this clarification.

Note: This text refers only to the operation of the

CKE bit in SPI mode; its operation in I2C

mode is unchanged.

Note: This correction applies to the Data Sheets

for the following devices:

• PIC16C6X (DS30234D), except

PIC16C61 (does not implement the

SSP module)

• PIC16C62B/72A (DS35008B)

• PIC16C63A/65B/73B/74B (DS30605C)

• PIC16C72/73/73A/74/74A/76/77

(DS30390E)

• PIC16C923/924 (DS30444E)

• PIC16C925/926 (DS39544A)

• PIC16F72 (DS39597B)

• PIC16F73/74/76/77 (DS30325B)

• PIC18F2331/2431/4331/4431

(DS39616B)

Any other devices not explicitly listed in this

section do not implement SPI mode and

are not affected by this clarification.

bit 6 CKE: SPI Clock Edge Select bit

1 = Transmit occurs on transition from active to Idle clock state

0 = Transmit occurs on transition from Idle to active clock state

Note: Polarity of clock state is set by the CKP bit (SSPCON<4>).

SSP MODULE

3. Module: SSP (I2C Mode) The description of the I2C pins related to the TRIS

bits is clarified. To ensure proper communication

of the I2C Slave mode, the TRIS bits (TRISx [SDA,

SCL]) corresponding to the I2C pins must be set to

‘1’. If any TRIS bits (TRISx<7:0>) of the port con-

taining the I2C pins (PORTx [SDA, SCL]) are

changed in software during I2C communication

using a Read-Modify-Write instruction (BSF, BCF),

then the I2C mode may stop functioning properly

and I2C communication may suspend. Do not

change any of the TRISx bits (TRIS bits of the port

containing the I2C pins) using the instruction BSF

or BCF during I2C communication. If it is absolutely

necessary to change the TRISx bits during

communication, the following method can be

used:

Note: This correction applies to the Data Sheets

for the following devices:

• PIC14000 (DS40122B)

• PIC16C6X (DS30234D) except

PIC16C61 (does not implement SSP

module)

• PIC16C62B/72A (DS35008B)

• PIC16C63A/65B/73B/74B (DS30605C)

• PIC16C72/73/73A/74/74A/76/77

(DS30390E)

• PIC16C923/924 (DS30444E)

• PIC16C925/926 (DS39544A)

• PIC16F72 (DS39597B)

• PIC16F73/74/76/77 (DS30325B)

MOVF TRISC, W ; Example for a 40-pin part such as the PIC16F73

IORLW 0x18 ; Ensures <4:3> bits are ‘11’

ANDLW B’11111001’ ; Sets <2:1> as output, but will not alter other bits

; User can use their own logic here, such as IORLW, XORLW and ANDLW

MOVWF TRISC

SSP MODULE

REVISION HISTORY

Revision A Document (7/2002):

Original version (I2C Slave Issue).

Revision B Document (1/2003):

Clarification of original issue to include Restart

conditions. Addition of data sheet clarification 1 (SPI

Mode, CKE bit).

Revision C Document (3/2003):

Addition of data sheet clarification 2 (SPI Slave Mode,

operation).

Revision D Document (9/2004):

Updated list of affected devices for silicon issue 1 (I2C

– Slave Mode) and 2 (SSP – SPI, Slave Mode),

removed silicon issue 3 (I2C – Slave Mode). Updated

list of affected devices for data sheet clarification 1

(SSP – SPI Mode) and 2 (SSP – SPI Slave Mode).

Added data sheet clarification 3 (SSP – I2C Mode).

Revision E Document (7/2006):

Removed silicon issue 2 (SSP – SPI Slave Mode).

Revision F Document (2/2007):

Added four devices to list of devices affected by the

silicon errata and clarified the related language.

Information contained in this publication regarding device

applications and the like is provided only for your convenience

and may be superseded by updates. It is your responsibility to

ensure that your application meets with your specifications.

MICROCHIP MAKES NO REPRESENTATIONS OR

WARRANTIES OF ANY KIND WHETHER EXPRESS OR

IMPLIED, WRITTEN OR ORAL, STATUTORY OR

OTHERWISE, RELATED TO THE INFORMATION,

INCLUDING BUT NOT LIMITED TO ITS CONDITION,

QUALITY, PERFORMANCE, MERCHANTABILITY OR

FITNESS FOR PURPOSE. Microchip disclaims all liability

arising from this information and its use. Use of Microchip

devices in life support and/or safety applications is entirely at

the buyer’s risk, and the buyer agrees to defend, indemnify and

hold harmless Microchip from any and all damages, claims,

suits, or expenses resulting from such use. No licenses are

conveyed, implicitly or otherwise, under any Microchip

intellectual property rights.

Trademarks

The Microchip name and logo, the Microchip logo, Accuron,

dsPIC, KEELOQ, KEELOQ logo, microID, MPLAB, PIC,

PICmicro, PICSTART, PRO MATE, PowerSmart, rfPIC, and

SmartShunt are registered trademarks of Microchip

Technology Incorporated in the U.S.A. and other countries.

AmpLab, FilterLab, Linear Active Thermistor, Migratable

Memory, MXDEV, MXLAB, PS logo, SEEVAL, SmartSensor

and The Embedded Control Solutions Company are

registered trademarks of Microchip Technology Incorporated

in the U.S.A.

Analog-for-the-Digital Age, Application Maestro, CodeGuard,

dsPICDEM, dsPICDEM.net, dsPICworks, ECAN,

ECONOMONITOR, FanSense, FlexROM, fuzzyLAB,

In-Circuit Serial Programming, ICSP, ICEPIC, Mindi, MiWi,

MPASM, MPLAB Certified logo, MPLIB, MPLINK, PICkit,

PICDEM, PICDEM.net, PICLAB, PICtail, PowerCal,

PowerInfo, PowerMate, PowerTool, REAL ICE, rfLAB,

rfPICDEM, Select Mode, Smart Serial, SmartTel, Total

Endurance, UNI/O, WiperLock and ZENA are trademarks of

Microchip Technology Incorporated in the U.S.A. and other

countries.

SQTP is a service mark of Microchip Technology Incorporated

in the U.S.A.

All other trademarks mentioned herein are property of their

respective companies.

Printed on recycled paper.

Note the following details of the code protection feature on Microchip devices:

• Microchip products meet the specification contained in their particular Microchip Data Sheet.

• Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the

intended manner and under normal conditions.

• There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our

knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data

Sheets. Most likely, the person doing so is engaged in theft of intellectual property.

• Microchip is willing to work with the customer who is concerned about the integrity of their code.

• Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not

mean that we are guaranteeing the product as “unbreakable.”

Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our

products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts

allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.

Microchip received ISO/TS-16949:2002 certification for its worldwide

headquarters, design and wafer fabrication facilities in Chandler and

Tempe, Arizona, Gresham, Oregon and Mountain View, California. The

Company’s quality system processes and procedures are for its PIC

MCUs and dsPIC

DSCs, KEELOQ

code hopping devices, Serial

EEPROMs, microperipherals, nonvolatile memory and analog

products. In addition, Microchip’s quality system for the design and

manufacture of development systems is ISO 9001:2000 certified.

AMERICAS

Corporate Office

2355 West Chandler Blvd.

Chandler, AZ 85224-6199

Tel: 480-792-7200

Fax: 480-792-7277

Technical Support:

http://support.microchip.com

Web Address:

www.microchip.com

Atlanta

Duluth, GA

Tel: 678-957-9614

Fax: 678-957-1455

Boston

Westborough, MA

Tel: 774-760-0087

Fax: 774-760-0088

Chicago

Itasca, IL

Tel: 630-285-0071

Fax: 630-285-0075

Dallas

Addison, TX

Tel: 972-818-7423

Fax: 972-818-2924

Detroit

Farmington Hills, MI

Tel: 248-538-2250

Fax: 248-538-2260

Kokomo

Kokomo, IN

Tel: 765-864-8360

Fax: 765-864-8387

Los Angeles

Mission Viejo, CA

Tel: 949-462-9523

Fax: 949-462-9608

Santa Clara

Santa Clara, CA

Tel: 408-961-6444

Fax: 408-961-6445

Toronto

Mississauga, Ontario,

Canada

Tel: 905-673-0699

Fax: 905-673-6509

ASIA/PACIFIC

Asia Pacific Office

Suites 3707-14, 37th Floor

Tower 6, The Gateway

Habour City, Kowloon

Hong Kong

Tel: 852-2401-1200

Fax: 852-2401-3431

Australia - Sydney

Tel: 61-2-9868-6733

Fax: 61-2-9868-6755

China - Beijing

Tel: 86-10-8528-2100

Fax: 86-10-8528-2104

China - Chengdu

Tel: 86-28-8665-5511

Fax: 86-28-8665-7889

China - Fuzhou

Tel: 86-591-8750-3506

Fax: 86-591-8750-3521

China - Hong Kong SAR

Tel: 852-2401-1200

Fax: 852-2401-3431

China - Qingdao

Tel: 86-532-8502-7355

Fax: 86-532-8502-7205

China - Shanghai

Tel: 86-21-5407-5533

Fax: 86-21-5407-5066

China - Shenyang

Tel: 86-24-2334-2829

Fax: 86-24-2334-2393

China - Shenzhen

Tel: 86-755-8203-2660

Fax: 86-755-8203-1760

China - Shunde

Tel: 86-757-2839-5507

Fax: 86-757-2839-5571

China - Wuhan

Tel: 86-27-5980-5300

Fax: 86-27-5980-5118

China - Xian

Tel: 86-29-8833-7250

Fax: 86-29-8833-7256

ASIA/PACIFIC

India - Bangalore

Tel: 91-80-4182-8400

Fax: 91-80-4182-8422

India - New Delhi

Tel: 91-11-4160-8631

Fax: 91-11-4160-8632

India - Pune

Tel: 91-20-2566-1512

Fax: 91-20-2566-1513

Japan - Yokohama

Tel: 81-45-471- 6166

Fax: 81-45-471-6122

Korea - Gumi

Tel: 82-54-473-4301

Fax: 82-54-473-4302

Korea - Seoul

Tel: 82-2-554-7200

Fax: 82-2-558-5932 or

82-2-558-5934

Malaysia - Penang

Tel: 60-4-646-8870

Fax: 60-4-646-5086

Philippines - Manila

Tel: 63-2-634-9065

Fax: 63-2-634-9069

Singapore

Tel: 65-6334-8870

Fax: 65-6334-8850

Taiwan - Hsin Chu

Tel: 886-3-572-9526

Fax: 886-3-572-6459

Taiwan - Kaohsiung

Tel: 886-7-536-4818

Fax: 886-7-536-4803

Taiwan - Taipei

Tel: 886-2-2500-6610

Fax: 886-2-2508-0102

Thailand - Bangkok

Tel: 66-2-694-1351

Fax: 66-2-694-1350

EUROPE

Austria - Wels

Tel: 43-7242-2244-39

Fax: 43-7242-2244-393

Denmark - Copenhagen

Tel: 45-4450-2828

Fax: 45-4485-2829

France - Paris

Tel: 33-1-69-53-63-20

Fax: 33-1-69-30-90-79

Germany - Munich

Tel: 49-89-627-144-0

Fax: 49-89-627-144-44

Italy - Milan

Tel: 39-0331-742611

Fax: 39-0331-466781

Netherlands - Drunen

Tel: 31-416-690399

Fax: 31-416-690340

Spain - Madrid

Tel: 34-91-708-08-90

Fax: 34-91-708-08-91

UK - Wokingham

Tel: 44-118-921-5869

Fax: 44-118-921-5820

WORLDWIDE SALES AND SERVICE

12/08/06