Translated and optimized for the Scenix SX by Nikolai Golovchenko
From 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) mov W, SourceL sub DestL, W mov W, SourceH sb C movsz W, ++SourceH sub DestH, W ;dest = dest - source, WITH VALID CARRY ;(although the Z flag is not valid). ;----------------------------
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<A HREF="http://www.piclist.com/techref/scenix/lib/math/sub/16bb_sx.htm"> SX Microcontroller Math Method 16 bit subtraction with borrow</A>
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