MSSP MODULE MSSP Module Silicon/Data Sheet Errata The PICmicro® microcontrollers you have received all exhibit anomalous behavior in their Master SSP (MSSP) modules, as described in this document. They otherwise conform functionally to the descriptions provided in their respective Device Data Sheets and Reference 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. 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 recognized and the Start status bit (SSPSTAT<3>) has been set and before a valid Stop condition is received. These issues are expected to be resolved in future silicon revisions of the designated parts. 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. Silicon issues 1 and 2 affect all silicon revisions of the following devices: This failure has been observed only under two circumstances: • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • PIC16C717 PIC16C770 PIC16C771 PIC16C773 PIC16C774 PIC16F737 PIC16F747 PIC16F767 PIC16F777 PIC16F872 PIC16F873 PIC16F873A PIC16F874 PIC16F874A PIC16F876 PIC16F876A PIC16F877 PIC16F877A PIC17C752 PIC17C756 PIC17C756A PIC17C762 PIC17C766 PIC18C242 PIC18C252 PIC18C442 PIC18C452 PIC18C601 PIC18C801 PIC18C658 PIC18C858 • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • © 2006 Microchip Technology Inc. PIC18F2220 PIC18F2320 PIC18F242 PIC18F2439 PIC18F248 PIC18F252 PIC18F2539 PIC18F258 PIC18F4220 PIC18F4320 PIC18F442 PIC18F4439 PIC18F448 PIC18F452 PIC18F4539 PIC18F458 PIC18F6520 PIC18F6525 PIC17F6585 PIC18F6620 PIC18F6621 PIC18F6680 PIC18F6720 PIC18F8520 PIC18F8525 PIC18F8585 PIC18F8620 PIC18F8621 PIC18F8680 PIC18F8720 • 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 timeout 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 settings of bits, SSPM3:SSPM0 (SSPCON1<3:0>); then, change the bits back to the desired configuration. 2. Disable the module by clearing the SSPEN bit (SSPCON1<5>); then, re-enable the module by setting the bit. Other methods may be available. DS80131E-page 1 MSSP MODULE Clarifications/Corrections to the Data Sheets Note: Items 1-3 apply to the Data Sheets for the following devices: • • • • • • • • • • • • • • PIC16C717/770/771 (DS41120B) PIC16C773/774 (DS30275A) PIC16F872 (DS30221B) PIC16F873/874/876/877 (DS30292C) PIC16F873A/874A/876A/877A (DS39582B) PIC17C752/756A/762/766 (DS30289B) PIC18C242/252/442/452 (DS39026C) PIC18C601/801 (DS39541A) PIC18C658/858 (DS30475A) PIC18F242/252/442/452 (DS39564B) PIC18F2220/2320/4220/4320 (DS39599C) PIC18F2439/2539/4439/4539 (DS30485A) PIC18F6520/6620/6720/8520/8620/ 8720 (DS39609B) PIC18F6585/6680/8585/8680 (DS30491C) 1. Module: MSSP (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). Note: This text refers only to the operation of the CKE bit in SPI mode; its operation in I2C mode is unchanged. For those data sheets that describe the SSPSTAT register in separate locations for SPI and I2C modes, this description applies only to the register titled “SSPSTAT Register (SPI Mode)”. 2. Module: MSSP (SPI Slave Mode) The description of the operation of SPI Slave mode is clarified as follows: the state of the clock line (SCK) must match the polarity for the Idle state before enabling the module. The subsection of the “MSSP Module” chapter, entitled “Slave Mode” (Subsection 3.6 in the majority of data sheets, Subsection 3.5 in others), is amended by adding the following paragraph to the end of the existing text: “Before enabling the module in SPI Slave mode, the clock line must match the proper Idle state. The clock line can be observed by reading the SCK pin. The Idle state is determined by the CKP bit (SSPCON1<4>) .” REGISTER 1: bit 6 SSPSTAT: MSSP STATUS REGISTER (EXCERPT) 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: DS80131E-page 2 Polarity of clock state is set by the CKP bit (SSPCON1<4>). © 2006 Microchip Technology Inc. MSSP MODULE 3. Module: MSSP (I2C Mode) The table for the I2C Baud Rate Generator clock rates is revised. Replace the I2C Clock Rate Table with the following: I2C™ CLOCK RATE w/BRG TABLE 1: FOSC FCY FCY * 2 BRG Value FSCL (2 Rollovers of BRG) 40 MHz 10 MHz 20 MHz 18h 400 kHz(1) 40 MHz 10 MHz 20 MHz 1Fh 312.5 kHz 40 MHz 10 MHz 20 MHz 63h 100 kHz 16 MHz 4 MHz 8 MHz 09h 400 kHz(1) 16 MHz 4 MHz 8 MHz 0Ch 308 kHz 16 MHz 4 MHz 8 MHz 27h 100 kHz 4 MHz 1 MHz 2 MHz 02h 333 kHz(1) 4 MHz 1 MHz 2 MHz 09h 100 kHz 4 MHz 1 MHz 2 MHz 00h 1 MHz(1) Note 1: The I2C™ interface does not conform to the 400 kHz I2C specification (which applies to rates greater than 100 kHz) in all details, but may be used with care where higher rates are required by the application. © 2006 Microchip Technology Inc. DS80131E-page 3 MSSP MODULE 4. Module: MSSP (I2C Mode) Note: Item 4 applies to the Data Sheets for the following devices: • • • • • PIC16C717/770/771 (DS41120B) PIC16C773/774 (DS30275A) PIC16F872 (DS30221B) PIC16F873/874/876/877 (DS30292C) PIC16F873A/874A/876A/877A (DS39582B) 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, MOVF IORLW ANDLW TRISC, W 0x18 B’11111001’ MOVWF TRISC DS80131E-page 4 ; ; ; ; SCL]) corresponding to the I2C pins must be set to ‘1’. If any TRIS bits (TRISx<7:0>) of the port containing 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: Example for a 40-pin part such as the PIC16F877A Ensures <4:3> bits are ‘11’ Sets <2:1> as output, but will not alter other bits User can use their own logic here, such as IORLW, XORLW and ANDLW © 2006 Microchip Technology Inc. MSSP 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 (MSSP – SPI, Slave Mode), removed silicon issue 3 (I2C – Slave Mode) and added data sheet clarifications 3 and 4 (MSSP – I2C Mode). Revision E Document (7/2006): Removed silicon issue 2 (MSSP – SPI, Slave Mode). © 2006 Microchip Technology Inc. DS80131E-page 5 MSSP MODULE NOTES: DS80131E-page 6 © 2006 Microchip Technology Inc. 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. 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, 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, Migratable Memory, MXDEV, MXLAB, 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, Linear Active Thermistor, Mindi, MiWi, MPASM, 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. © 2006, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. Printed on recycled paper. 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 PICmicro® 8-bit MCUs, 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. © 2006 Microchip Technology Inc. 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