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ManualsBrandsMICROCHIP TECHNOLOGY ManualsMicrocontrollers, Microprocessors & QuartzesEmbedded microcontroller PDIP 18 8-Bit 20 MHz I/O number 16

TIMER1 MODULE

The PIC

microcontrollers you have received all exhibit

anomalous behavior in their Timer1 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 any 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.

These issues are expected to be resolved in future

silicon revisions of the designated parts.

Silicon issue 1 affects all silicon revisions of the

following devices:

• PIC12F609 • PIC12F615 • PIC12F629 • PIC12F675 • PIC14C000

• PIC12HV609 • PIC12HV615 • PIC12F635 • PIC12F683

• PIC16C62A • PIC16C745 • PIC16F616 • PIC16F716 • PIC16F876A

• PIC16C62B • PIC16C765 • PIC16HV616 • PIC16F737 • PIC16F877

• PIC16C63 • PIC16C773 • PIC16F627A • PIC16F747 • PIC16F877A

• PIC16C63A • PIC16C774 • PIC16F628A • PIC16F767 • PIC16F882

• PIC16C64A • PIC16C923 • PIC16F630 • PIC16F777 • PIC16F883

• PIC16C65A • PIC16C924 • PIC16F631 • PIC16F785 • PIC16F884

• PIC16C65B • PIC16C925 • PIC16F636 • PIC16HV785 • PIC16F886

• PIC16C66 • PIC16C926 • PIC16F639 • PIC16F818 • PIC16F887

• PIC16C67 • PIC16F72 • PIC16F648A • PIC16F819 • PIC16F913

• PIC16C72 • PIC16F73 • PIC16F676 • PIC16F870 • PIC16F914

• PIC16C72A • PIC16F74 • PIC16F677 • PIC16F871 • PIC16F916

• PIC16C73A • PIC16F76 • PIC16F684 • PIC16F872 • PIC16F917

• PIC16C73B • PIC16F77 • PIC16F685 • PIC16F873 • PIC16F946

• PIC16C74A • PIC16F87 • PIC16F687 • PIC16F873A

• PIC16C74B • PIC16F88 • PIC16F688 • PIC16F874

• PIC16C76 • PIC16F610 • PIC16F689 • PIC16F874A

• PIC16C77 • PIC16HV610 • PIC16F690 • PIC16F876

• PIC17C42A • PIC17C44 • PIC17C756 • PIC17C762

• PIC17C43 • PIC17C752 • PIC17C756A • PIC17C766

Timer1 Module Silicon Errata Sheet

Summary of content (8 pages)

PAGE 1
TIMER1 MODULE Timer1 Module Silicon Errata Sheet The PIC® microcontrollers you have received all exhibit anomalous behavior in their Timer1 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 any silicon release errata for particular devices. These issues are expected to be resolved in future silicon revisions of the designated parts.
PAGE 2
TIMER1 MODULE • PIC18C242 • PIC18F2480 • PIC18F4685 • PIC18F25J10 • PIC18F84J11 • PIC18C252 • PIC18F2510 • PIC18F6490 • PIC18F44J10 • PIC18F84J90 • PIC18C442 • PIC18F2520 • PIC18F6520 • PIC18F45J10 • PIC18F85J10 • PIC18C452 • PIC18F2539 • PIC18F6525 • PIC18F63J11 • PIC18F85J11 • PIC18C601 • PIC18F2550 • PIC18F6527 • PIC18F63J90 • PIC18F85J15 • PIC18C658 • PIC18F2585 • PIC18F6585 • PIC18F64J11 • PIC18F85J50 • PIC18C801 • PIC18F2610 • PIC18F6620 • PIC18F64J90 • PIC18F85J90 •
PAGE 3
TIMER1 MODULE 1. Module: Timer1 (Asynchronous Counter) applies any time the TMR1H register is written. If the TMR1H register is not completely written to during the high pulse of the external clock, then the TMR1L register will miss a count due to the circuit operation stated previously. The high pulse of a 32.768 kHz external clock crystal yields a 15.25 μs window for the write to TMR1H to occur.
PAGE 4
TIMER1 MODULE EXAMPLE 1: PIC12/PIC14/PIC16 INTERRUPT SERVICE ROUTINE ISR @ 0x004 ; (3-4Tcy), fixed interrupt latency MOVWF MOVF MOVWF w_temp STATUS,w status_temp BANKSEL PIR BTFSS PIR,TMRIF GOTO EXIT RELOAD BSF EXIT MOVF MOVWF SWAPF SWAPF RETFIE ; (1Tcy), save off current W register contents ; (1Tcy), move status register into W register ; (1Tcy), save off contents of STATUS register ; (2Tcy), choose correct SFR bank ; (2Tcy), did a Timer1 overflow occur? ; No TMR1H,7 ; (1Tcy) Yes, reload for a 1 s
PAGE 5
TIMER1 MODULE REVISION HISTORY Revision A Document (4/2005): Original version of this document. Silicon issue 1 (Timer1 – Asynchronous Counter). Revision B Document (9/2005): Updated the list of affected devices. Revision C Document (1/2007): Updated the list of affected devices. © 2007 Microchip Technology Inc.
PAGE 7
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.
PAGE 8
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