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

regards,
Reggie

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Scott Dattalo wrote:
>
> Guys & Alice
>
> It seems like there's been several questions about delay loops in the
> last few weeks. So I thought it'd be interesting to see if we could turn
> this into a challenge:
>
> Create a delay loop that can loop for up to 2^16 times while mininmizing
> the number of cycles per iteration. For example:
>
>   clrf   lo
>   clrf   hi
>
>   movlw  1
>
> loop:
>
>   addwf  lo,f    ;increment the low byte
>   skpnc          ;if low byte rolls over
>    addwf hi,f    ; then increment the high byte
>
>   skpc           ;We're done if the high byte rolls over.
>    goto  loop
>
> This will loop 2^16 times and each pass through the loop is 6 cycles.
>
> I've got a solution that takes 5 cycles per iteration and doesn't use W
> (oh I shouldn't have said that - now you know the answer!).
>
> Any takers?
>
> Scott