PIC16F91X/946 PIC16F91X/946 Family Silicon Errata and Data Sheet Clarification The PIC16F91X/946 family devices that you have received conform functionally to the current Device Data Sheet (DS41250F), except for the anomalies described in this document. For example, to identify the silicon revision level using MPLAB IDE in conjunction with MPLAB ICD 2, MPLAB ICD 3, PICkit™ 2 or PICkit™ 3: 1. The silicon issues discussed in the following pages are for silicon revisions with the Device and Revision IDs listed in Table 1. The silicon issues are summarized in Table 2. 2. The errata described in this document will be addressed in future revisions of the PIC16F91X/946 silicon. Note: 3. This document summarizes all silicon errata issues from all revisions of silicon, previous as well as current. Only the issues indicated in the last column of Table 2 apply to the current silicon revision. 4. Note: Data Sheet clarifications and corrections start on page 6, following the discussion of silicon issues. The silicon revision level can be identified using the current version of MPLAB® IDE and Microchip’s programmers, debuggers, and emulation tools, which are available at the Microchip corporate web site (www.microchip.com). TABLE 1: Using the appropriate interface, connect the device to the MPLAB ICD 2 and MPLAB ICD 3 programmer/debugger, PICkit™ 2 or PICkit™ 3. From the main menu in MPLAB IDE, select Configure>Select Device, and then select the target part number in the dialog box. Select the MPLAB hardware tool (Programmer>Select Tool). Perform a “Connect” operation to the device (Programmer>Connect). Depending on the development tool used, the part number and Device Revision ID value appear in the Output window. If you are unable to extract the silicon revision level, please contact your local Microchip sales office for assistance. The Device ID values for the various devices and silicon revisions are shown in Table 1. SILICON DEVREV VALUES Part Number Revision ID for Silicon Revision(2) Device ID(1) A0 A1 A2 A3 B0 B1 B2 B3 PIC16F913 13Exh 0 0 1 2 PIC16F914 13Cxh 0 0 1 2 PIC16F916 13Axh 0 0 1 2 2 3 4 PIC16F917 138xh 0 0 1 2 2 3 4 PIC16F946 146xh 0 0 1 Note 1: 2: The device and revision data is stored in the Device ID located at 2006h in program memory. Refer to the “PIC16F91X/946 Memory Programming Specification” (DS41244) for detailed information. © 2009 Microchip Technology Inc. DS80238C-page 1 PIC16F91X/946 TABLE 2: Module SILICON ISSUE SUMMARY (PIC16F913/914) Feature Item Number Affected Revisions(1) Issue Summary A0 A1 A2 A3 Type B 1. Incorrect waveforms. x x x x Timer1 LP 2. Low drive as temp. approaches -40°C. x x x x Timer1 Ext. Crystal 3. Overflow may take additional count. x x x x Timer0/ WDT Prescaler 4. Reset under specific conditions. x x x x LCD Note 1: Only those issues indicated in the last column apply to the current silicon revision. TABLE 3: Module SILICON ISSUE SUMMARY (PIC16F916/917) Feature Item Number Affected Revisions(1) Issue Summary A0 A1 A2 B0 B1 B2 B3 Type B 1. Incorrect waveforms. x x x x x x x Timer1 LP 2. Low drive as temp. approaches -40°C. x x x x x x x Timer1 Ext. Crystal 3. Overflow may take additional count. x x x x x x x Timer0/ WDT Prescaler 4. Reset under specific conditions. x x x x x x x LCD Note 1: Only those issues indicated in the last column apply to the current silicon revision. TABLE 4: Module SILICON ISSUE SUMMARY (PIC16F946) Feature Item Number Affected Revisions(1) Issue Summary A0 A1 A2 Type B 1. Incorrect waveforms. x x x Timer1 LP 2. Low drive as temp. approaches -40°C. x x x Timer1 Ext. Crystal 3. Overflow may take additional count. x x x Timer0/ WDT Prescaler 4. Reset under specific conditions. x x x LCD Note 1: Only those issues indicated in the last column apply to the current silicon revision. DS80238C-page 2 © 2009 Microchip Technology Inc. PIC16F91X/946 Silicon Errata Issues Note: This document summarizes all silicon errata issues from all revisions of silicon, previous as well as current. Only the issues indicated by the shaded column in the following tables apply to the current silicon revision (as applicable). 1. Module: LCD Work around Avoid the use of type-B waveforms with one-third multiplex. When one-third is required, use type-A waveforms. Affected Silicon Revisions PIC16F913/914 A0 A1 A2 A3 X X X X A0 A1 A2 B0 B1 B2 B3 X X X X X X X PIC16F946 A2 X X X This can also prevent Timer1 oscillator start-up under cold conditions. © 2009 Microchip Technology Inc. Use of low-power crystals properly matched to the device will reduce the likelihood of failure. A 1MΩ resister between OSC2 and VDD will further improve the drive strength of the circuit. Affected Silicon Revisions PIC16F913/914 A0 A1 A2 A3 X X X X PIC16F916/917 PIC16F916/917 A1 1-2% of devices experience reduced drive as temperatures approach -40°C. This will result in a loss of Timer1 counts or stopped Timer1 oscillation. Work around The LCD module may generate incorrect waveforms when using type-B waveforms (WFT = 1) with one-third multiplex (LMUX<1:0> = 10). A0 2. Module: LP/Timer1 Oscillator Operation Below 25°C A0 A1 A2 B0 B1 B2 B3 X X X X X X X PIC16F946 A0 A1 A2 X X X DS80238C-page 3 PIC16F91X/946 3. Module: Asynchronous Timer1 This Errata supersedes Errata DS80329. When TImer1 is started or updated, the timer needs to see a falling edge from the external clock source before a rising edge can increment the counter. If writes to TMR1H and TMR1L are not completed while the external clock pulse is still high, Timer1 will not count the first clock pulse after the update. When using an external crystal, the pulse width from rising to falling edge is temperature dependent and may decrease with temperature. As a result, the timer may require an additional oscillation to overflow. Work around Switching to the HFINTOSC after reloading, the timer ensures the Timer1 will see a falling edge before switching back to the external clock source. Due to the time from Timer1 overflow to the reload being application specific, wait for the timer to increment before beginning the reload sequence. This ensures the timer does not miss a rising edge during reload. EXAMPLE 1: BTFSC GOTO BTFSS GOTO TMR1L,0 $-1 TMR1L,0 $-1 ;Timer has just incremented, 31 μs before next rising edge to ;complete reload Update: BCF BSF BCF BSF BCF T1CON,TMR1CS TMR1H,7 T1CON,TMR1ON T1CON,TMR1CS T1CON,TMR1ON ;Select ;Timer1 ;Timer1 ;Select ;Timer1 HFINTOSC for Timer1 high byte 0x80 off external crystal on Critical Timing of code sequence for instructions following last write to TMR1L or TMR1H. Affected Silicon Revisions PIC16F913/914 A0 A1 A2 A3 X X X X PIC16F916/917 A0 A1 A2 B0 B1 B2 B3 X X X X X X X PIC16F946 A0 A1 A2 X X X DS80238C-page 4 © 2009 Microchip Technology Inc. PIC16F91X/946 4. Module: Timer0 and WDT Prescaler Assignment Spurious Reset A spurious Reset may occur if the Timer0/Watchdog Timer (WDT) prescaler is assigned from the WDT to Timer0 and then back to the WDT. Summary The issue only arises when all of the below conditions are met: • Timer0 external clock input (TOCKI) is enabled. • The Prescaler is assigned to the WDT, then to the Timer0 and back to the WDT. • During the assignments, the T0CKI pin is high when bit TOSE is set, or low when TOSE is clear. • The 1:1 Prescaler option is chosen. Affected Silicon Revisions PIC16F913/914 A0 A1 A2 A3 X X X X PIC16F916/917 A0 A1 A2 B0 B1 B2 B3 X X X X X X X PIC16F946 A0 A1 A2 X X X Description On a POR, the Timer0/WDT prescaler is assigned to the WDT. If the prescaler is reassigned to Timer0 and Timer0 external clock input (TOCKI) is enabled then the prescaler would be clocked by a transition on the TOCKI pin. On power-up, the TOCKI pin is (by default) enabled for Timer0 in the OPTION register. If the T0CKI pin is: • High and Timer0 is configured to transition on a falling edge (TOSE set), or • Low and Timer0 is configured to transition on a rising edge (TOSE clear) Then, if the prescaler is reassigned to the WDT, a clock pulse to the prescaler will be generated on the reassignment. If the prescaler is configured for the 1:1 option, the clock pulse will incorrectly cause a WDT Time-out Reset of the device. Work around 1. Disable the Timer0 external clock input by clearing the TOCKI bit in the OPTION register. 2. Modify the TOSE bit in the OPTION register to the opposite configuration for the logic level on the T0CKI pin. 3. Select a prescaler rate other than 1:1 and issue a CLRWDT instruction before switching to the final prescaler rate. © 2009 Microchip Technology Inc. DS80238C-page 5 PIC16F91X/946 Data Sheet Clarifications APPENDIX A: The following typographical corrections and clarifications are to be noted for the latest version of the device data sheet (DS41250F): Rev A Document (5/2005) Initial release of Errata, adding Items 1-3. Note: Corrections are shown in bold. Where possible, the original bold text formatting has been removed for clarity. 1. Module: LCD Driver Module Block Diagram (Note 1) In Figure 10-1; “LCD Driver Module Block Diagram,” page 144, change Note 1: From: These are not directly connected to the I/O pads, but may be tri-stated, depending on the configuration of the LCD module. To: DOCUMENT REVISION HISTORY Rev B Document (2/2007) Added Module 1: LCD. Rev. C Document (4/2009) Updated Errata to new format. This Errata supersedes Errata DS80329. Data Sheet Clarification: Removed Module 1: CCPR2L/CCPR2H Address and Module 3: MCLR. Added Module 2: LP/Timer1 Oscillator Operation Below 25°C; Added Module 3: Asynchronous Timer1; Module 4: Timer0 and WDT Prescaler Assignment Spurious Reset. These signals are connected directly to the I/O pads, but may be tri-stated, depending on the configuration of the LCD module. DS80238C-page 6 © 2009 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, KEELOQ logo, MPLAB, PIC, PICmicro, PICSTART, rfPIC, SmartShunt and UNI/O are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. FilterLab, Hampshire, Linear Active Thermistor, 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, dsSPEAK, ECAN, ECONOMONITOR, FanSense, In-Circuit Serial Programming, ICSP, ICEPIC, Mindi, MiWi, MPASM, MPLAB Certified logo, MPLIB, MPLINK, mTouch, nanoWatt XLP, PICkit, PICDEM, PICDEM.net, PICtail, PIC32 logo, PowerCal, PowerInfo, PowerMate, PowerTool, REAL ICE, rfLAB, Select Mode, Total Endurance, TSHARC, 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. © 2009, 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 design centers in California and India. 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. © 2009 Microchip Technology Inc. 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