Mike Harrison [mike@WHITEWING.CO.UK] says:
While we're on the subject of inline delays, here's a handy 'delay any number of cycles' (within reason!) macro I did when messing with generating TV timings :usage : wait n delays n cycles, n = 0 to about 1024. shortwait macro del ; used by main wait macro if (del>3) && (del<8) call del7+(7-(del)) endif if del <4 if del>=2 goto $+1 endif if ((del) & 1) == 1 nop endif endif endm ; main macro - generates code to wait for (del) cycles) wait macro del if (del)<0 error 'negative delay' endif if (del)>=8 movlw ((del)-8) /4 call delay shortwait ((del-8) % 4) else shortwait (del) endif endm delay addlw 0ff skpnc goto delay return del7 goto del5 ; 7 cycle delay del6 goto del4 ; 6 cycle delay del5 nop ; 5 cycle delay del4 return ; 4 cycle delay
|file: /Techref/microchip/delay/xb0cr-mh.htm, 1KB, , updated: 2007/6/22 14:54, local time: 2023/5/31 12:39,
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<A HREF="http://www.massmind.org/Techref/microchip/delay/xb0cr-mh.htm"> Delay X cycles (0-1024) macro by Mike Harrison</A>
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