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PIC Microcontoller Math Method

Increment / Decrement

packed BCD

From Regulus Berdin

;Increment/Decrement routines for packed BCD 
;6 digit bcd in bcd1:bcd2:bcd3:...(lsb:msb) 
        cblock  0x0c 
        movlw   bcd1 
        movwf   FSR 
        movlw   3               ;adjust for number of digits 
        movwf   tmp 
iloop   movlw   0x67 
        addwf   INDF 
        movlw   0x60 
         movlw  0x66 
         subwf  INDF 
         goto   iquit 
        incf    FSR 
        decfsz  tmp 
         goto   iloop 
iquit   retlw   0 

        movlw   bcd1 
        movwf   FSR 
        movlw   3               ;adjust for number of digits 
        movwf   tmp 
dloop   movlw   1 
        subwf   INDF 
        addwf   INDF,w 
        movlw   0x6 
         movlw  0x66 
         subwf  INDF 
        xorlw   0x66 
         goto   dquit 
        incf    FSR 
        decfsz  tmp 
         goto   dloop 
dquit   retlw   0 

The routines can accomodate to any number of BCD digits, just change the movlw 3. 

file: /Techref/microchip/math/incdec/packedBCD-RB.htm, 1KB, , updated: 2009/2/13 15:35, local time: 2022/8/13 10:41,

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