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PIC Microcontoller Subtraction Math Method


16 bit subtraction with borrow 

  Rudy Wieser

;----------------------------
; 16-bit Subtraction-with-Borrow
;       SourceH:SourceL - Number to be subtracted
;       Carry - NOT( Borrow to be subtracted )
;       DestH:DestL - Number to be subtracted FROM
;Out    DestH:DestL - Result
;       Carry - NOT( Borrow result)

        movf    SourceL,W
        subwf   DestL
        movf    SourceH,W
        btfss   STATUS,C
        incfsz  SourceH,W
        subwf   DestH           ;dest = dest - source, WITH VALID CARRY
                                ;(although the Z flag is not valid).

;----------------------------

Comments:

See also:

file: /Techref/microchip/math/sub/16bb.htm, 2KB, , updated: 2011/3/9 00:49, local time: 2012/2/9 15:45,
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