For a more deluxe (but of course larger) delay macro, see the results of
the SX Microcontroller Serial Video Display contest at:
http://www.sxList.com/techref/ubicom/lib/io/dev/video/servid.htm

The delay used by SERVID has to have a lot larger range than 1024 cycles
since the SX is running at over 40 million instructions per second. :-)

-- Rich


Mike Harrison wrote:
>
> 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
>
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