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PIC Microcontoller Subtraction Math Method 


sub32: 
        movf    a1,w 
        subwf   b1,f 

        movf    a2,w 
        skpc 
         incfsz a2,w 
          subwf b2,f 

        movf    a3,w 
        skpc 
         incfsz a3,w 
          subwf b3,f 

        movf    a4,w 
        skpc 
         incfsz a4,w 
          subwf b4,f

Following on from the multi-byte addition routines by Dwayne Reid and Regulus Berdin this works for 32-bit signed/unsigned subtraction. (only tested in Visual Baisc) 

sub32   ;OpD=OpD-OpB
        movf    OpB + 0, W
        subwf   OpD + 0, F

        movf    OpB + 1, W
        skpc
         incfsz OpB + 1, W
          subwf OpD + 1, F

        movf    OpB + 2, W
        skpc
         incfsz OpB + 2, W
          subwf OpD + 2, F

        movf    OpB + 3, W
        skpc
         incfsz OpB + 3, W
          subwf OpD + 3, F
file: /techref/microchip/math/sub/32bb-drrb.htm, 1KB, , updated: 2009/2/13 15:09, local time: 2009/11/22 19:49,
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