Count Seconds, Minutes, and Hours by Andrew Warren
SECONDS EQU [any register, on any page] MINUTES EQU SECONDS+1 HOURS EQU MINUTES+1 TICK: MOVLW SECONDS ;First, initialize the FSR to point MOVWF FSR ; at SECONDS. CALL SUB1 ;Use the BCD-increment code to inc CALL SUB0 ; SECONDS and then MINUTES. CALL SUB0 ;Call it one last time to increment ; HOURS. GOTO SUB2 ;Keep HOURS in the range [0-23]. SUB0: INCF FSR ;You enter here to point to the next SKPNC ; register before incrementing it. SUB1: INCF INDF ;Or enter here to just increment the ; register. MOVLW 6 ;Use this MOVLW/ADDWF to see whether ADDWF INDF ; reg is outside the range [0-9]. SKPDC ;Obscure DC flag usage was contributed SUBWF INDF ; by Scott Dattalo. MOVLW 0100H - 060H ;Load W with a value that'll make the SUB2: ADDWF INDF,W ; ADDWF overflow if the reg > 60. SKPNC ;If there's an overflow, clear the CLRF INDF ; register. RETLW 0100H - 024H ;Now return with W holding a value that ; will make ADDWF overflow if reg>24.
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<A HREF="http://techref.massmind.org/techref/microchip/countsecminhrs-aw.htm"> PIC Microcontoller Time Method: Count Seconds, Minutes, and Hours by Andrew Warren</A>
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