Hi Sean,

I think this is not the case, my routine has a "goto $+2" not a "goto
loop" after the first increment (to be isochronous to 5 cycles per
loop).  The total cycles should be:

Cycles = (65536 - (hi * 256 + lo)) * 5

Except when hi and lo is zero which is 65536*5 cycles.

regards,
Reggie

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Sean Breheny wrote:
> In case anyone wants to use this loop, the more general form is:
>
>              movlw x
>              movwf xf
>              movlw y
>              movwf xy
>              delay(A)
> aloop        delay(B)
>              decfsz xf,f
>              goto aloop
>              delay(C)
>              decfsz yf,f
>              goto aloop
>
> Which has the timing expression:
>
> total cycles = (770+256*B+C)*Y + (B+3) * X + A + 2
>
> In the case given by Reggie, where A=B=C=0:
>
> total cycles = 770*Y + 3*X + 2
>
> Sean
>
> At 09:42 AM 5/7/99 +0800, you wrote:
> >Hi Scott,
> >
> >How about, 5 cycles per loop, doesn't use W:
> >
> >        clrf    lo
> >        clrf    hi
> >
> >loop    incfsz  lo,f
> >         goto   $+2
> >        incfsz  hi,f
> >         goto   loop