PIC16F684 PIC16F684 Rev. A Silicon/Data Sheet Errata The PIC16F684 parts you have received conform functionally to the Device Data Sheet (DS41202D), except for the anomalies described below. Microchip intends to address all issues listed here in future revisions of the PIC16F684 silicon. 1. Module: Resets (when WDT times out) If the OPTION_REG bits, PS<2:0>, are clear, multiple spurious Resets can occur when the WDT times out. These Resets can occur even when the PSA bit is clear, assigning the prescaler to the Timer0. Work around If a CLRWDT instruction is issued before the WDT times out and before the OPTION register is modified, this problem is eliminated. Date Codes that pertain to this issue: All engineering and production devices. 2. Module: Data EEPROM Memory The EEIF flag may be cleared inadvertently when performing operations on the PIR1 register simultaneously with the completion of an EEPROM write. This condition occurs when the EEPROM write timer completes at the same moment that the PIR1 register operation is executed. Register operations are those that have the PIR1 register as the destination and include, but are not limited to, BSF, BCF, ANDWF, IORWF and XORWF. Work around 1. Avoid operations on the PIR1 register when writing to the EEPROM memory. 2. Poll the WR bit (EECON1<1>) to determine when the write is complete. 3. Use a timer interrupt to catch any instances when the EEIF flag is inadvertently cleared. The timer interrupt should be set longer than 8 ms. If EEIF fails, then the timer interrupt occurs as a default time out. The WR and WRERR flags are checked as part of the timer interrupt service routine to verify the EEPROM write success. © 2006 Microchip Technology Inc. 4. If periodic interrupts are occurring in addition to the EEIF interrupts, then use a secondary flag to sense write completion. The secondary flag is set whenever EEPROM writes are active. An EEPROM write completion is indicated when the secondary flag is set and the WR flag is clear. 3. Module: ECCP with Auto-Shutdown (Silicon Rev. A4 and B2) The PIC16F684 Rev. A4 silicon for the ECCP Auto-Shutdown is connected to the C1IF and C2IF flags. See Figures 8-2 and 8-3 on the following page. Rev. A4’s auto-shutdown connection to C1IF and C2IF causes the auto-shutdown to incorrectly operate synchronously. Additionally, reads of CMCON0 will incorrectly clear an auto-shutdown event. Work around Rev. A4 Silicon 1) Poll the CxOUT bit until it is low. 2) Read CMCON1 to precondition CxIF. 3) If CMCON0 is read while CxOUT is changing, repeat steps 1 and 2. Fix Rev. B2 Silicon The Silicon Rev. B2 device (now shipping) has moved the auto-shutdown connection from CxIF to CxOUT. This will eliminate the synchronous shutdown and simplify the use of the comparator for a shutdown event. Figure 1 shows the function of auto-shutdown before and after the device revision. DS80197E-page 1 PIC16F684 FIGURE 8-2: COMPARATOR C1 OUTPUT BLOCK DIAGRAM MULTIPLEX PORT Pins C1INV To C1OUT pin C1 Rev. B: To ECCP Auto-Shutdown D Q1 To Data Bus Q EN RD CMCON0 Set C1IF bit D Q3*RD CMCON0 Q Rev. A: To ECCP Auto-Shutdown EN CL Reset Note 1: 2: FIGURE 8-3: Q1 and Q3 are phases of the four-phase system clock (FOSC). Q1 is held high during Sleep mode. COMPARATOR C2 OUTPUT BLOCK DIAGRAM C2SYNC PORT Pins MULTIPLEX To Timer1 Gate C2INV 0 C2 To C2OUT pin D 1 Q Rev. B: To ECCP Auto-Shutdown Timer1 clock source(1) D Q1 To Data Bus Q EN RD CMCON0 Set C2IF bit D Q3*RD CMCON0 Q EN CL Rev. A: To ECCP Auto-Shutdown Reset Note 1: DS80197E-page 2 Comparator output is latched on falling edge of Timer1 clock source. 2: Q1 and Q3 are phases of the four-phase system clock (FOSC). 3: Q1 is held high during Sleep mode. © 2006 Microchip Technology Inc. PIC16F684 FIGURE 1: SILICON REVISION A4 VS. REVISION B2 A4 CCP Output B2 CCP Output CxOUT CxIF Uncertainty due to Q1 cycle delay © 2006 Microchip Technology Inc. Read CMCON0 Uncertainty due to Q1 cycle delay Read CMCON0 DS80197E-page 3 PIC16F684 Clarifications/Corrections to the Data Sheet: In the Device Data Sheet (41202D), the following clarifications and corrections should be noted. N/A. REVISION HISTORY Rev A Document (7/2004) First revision of this document. Changes made to Section 11.1.1, “CCP1 Pin Configuration”. Rev B Document (08/2004) Issue 1 – When OPTION_REG bits, PS<2:0>, are clear, multiple spurious Resets can occur when the WDT times out. Rev C Document (11/2004) Added Module 2: “Data EEPROM Memory” for PIC16F684 silicon. Rev D Document (7/2005) Data Sheet Clarifications/Corrections Section: Added Module 2: New 4x4 QFN Package added. Rev E Document (7/2006) Added Module 3: ECCP with Auto-Shutdown (Silicon Rev. A4 and B2). Clarifications/Corrections to the Data Sheet: Removed Items 1 and 2, which have been incorporated into the data sheet. DS80197E-page 4 © 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. DS80197E-page 5 WORLDWIDE SALES AND SERVICE AMERICAS ASIA/PACIFIC ASIA/PACIFIC EUROPE 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 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 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 Austria - Wels Tel: 43-7242-2244-3910 Fax: 43-7242-2244-393 Denmark - Copenhagen Tel: 45-4450-2828 Fax: 45-4485-2829 India - Pune Tel: 91-20-2566-1512 Fax: 91-20-2566-1513 France - Paris Tel: 33-1-69-53-63-20 Fax: 33-1-69-30-90-79 Japan - Yokohama Tel: 81-45-471- 6166 Fax: 81-45-471-6122 Germany - Munich Tel: 49-89-627-144-0 Fax: 49-89-627-144-44 Atlanta Alpharetta, GA Tel: 770-640-0034 Fax: 770-640-0307 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 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: 86-28-8676-6200 Fax: 86-28-8676-6599 Korea - Gumi Tel: 82-54-473-4301 Fax: 82-54-473-4302 China - Fuzhou Tel: 86-591-8750-3506 Fax: 86-591-8750-3521 Korea - Seoul Tel: 82-2-554-7200 Fax: 82-2-558-5932 or 82-2-558-5934 China - Hong Kong SAR Tel: 852-2401-1200 Fax: 852-2401-3431 Malaysia - Penang Tel: 60-4-646-8870 Fax: 60-4-646-5086 China - Qingdao Tel: 86-532-8502-7355 Fax: 86-532-8502-7205 Philippines - Manila Tel: 63-2-634-9065 Fax: 63-2-634-9069 China - Shanghai Tel: 86-21-5407-5533 Fax: 86-21-5407-5066 Singapore Tel: 65-6334-8870 Fax: 65-6334-8850 China - Shenyang Tel: 86-24-2334-2829 Fax: 86-24-2334-2393 Taiwan - Hsin Chu Tel: 886-3-572-9526 Fax: 886-3-572-6459 China - Shenzhen Tel: 86-755-8203-2660 Fax: 86-755-8203-1760 Taiwan - Kaohsiung Tel: 886-7-536-4818 Fax: 886-7-536-4803 China - Shunde Tel: 86-757-2839-5507 Fax: 86-757-2839-5571 Taiwan - Taipei Tel: 886-2-2500-6610 Fax: 886-2-2508-0102 China - Wuhan Tel: 86-27-5980-5300 Fax: 86-27-5980-5118 Thailand - Bangkok Tel: 66-2-694-1351 Fax: 66-2-694-1350 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 China - Xian Tel: 86-29-8833-7250 Fax: 86-29-8833-7256 07/21/06 DS80197E-page 6 © 2006 Microchip Technology Inc.