On Thu, 6 May 1999, Bob Fehrenbach wrote:

>         clrf    lo
>         clrf    hi
> loop:
>         incf    lo, f
>         skpnz
>         incfsz  hi, f
>         goto    loop

That's exactly my solution. And

On Fri, 7 May 1999, Regulus Berdin wrote:

>
> 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
>

Yep!

Here's another solution that gives two extra cycles for other stuff
(like CLRWDT or testing an I/O bit)

    clrf   lo
    clrf   hi

loop1

    nop             ;2 free cycles executed 255 out of 256
    nop             ;iterations

loop2

    decfsz  lo,f   ;or incfsz
     goto   loop1
    decfsz  hi,f   ;if low byte rolls over, dec hi byte,
     goto   loop2  ;but don't branch to the beginning.