;from Paul W. Webster MOVF file,W ANDLW fmask ; fmask for bit 0 is defined as 0x01 IORWF shadA,W ; add in desired outputs from shadow MOVWF PORTA
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 BSF or BCF on shadA, never PORTA.
;from Paul W. Webster MOVF file,W XORWF PORTA,W ; derive "difference" value. ANDLW fmask ; fmask for bit 0 is defined as 0x01 XORWF PORTA,F ; Flip bit if not same.
file: /Techref/scenix/lib/math/bit/cbrpwoj.htm, 1KB, , updated: 2004/6/10 14:40, local time: 2024/10/18 23:31,
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Ashley Roll has put together a really nice little unit here. Leave off the MAX232 and keep these handy for the few times you need true RS232! |
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