;from Paul W. Webster mov W, file and W, #fmask ; fmask for bit 0 is defined as 0x01 or W, shadA ; add in desired outputs from shadow mov RA, W
Only changes port A on the last cycle. Note that you must call this routine (subroutine/ macro) *whenever* you write to an output bit, which you always do using a SETB or CLRB on shadA, never RA.
;from Paul W. Webster mov W, file xor W, RA ; derive "difference" value. and W, #fmask ; fmask for bit 0 is defined as 0x01 xor RA, W ; Flip bit if not same.
|file: /Techref/scenix/lib/math/bit/cbrpwoj_sx.htm, 1KB, , updated: 2004/6/10 14:40, local time: 2023/3/31 01:55,
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<A HREF="http://www.massmind.org/Techref/scenix/lib/math/bit/cbrpwoj_sx.htm"> SX Microcontroller Bit Math Method Transfer one bit from a file register to one pin of PORT w/o jitter</A>
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