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). ;----------------------------
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<A HREF="http://www.piclist.com/Techref/microchip/math/sub/16bb.htm"> PIC Microcontoller Math Method 16 bit subtraction with borrow</A>
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