Peter wrote:
> > > RESULT = (255 / A) * B
>Do you really need 255*B  ?
>Say you have variables
>A
>B_Hi
>B_Lo
>
>If you can get away with 256*B then you just need to store B into B_Hi and
>make B_Lo = 0.
>
>Now just perform the 16bit (B_Hi:B_Lo) division by 8bit A.
>
>I think it would be quicker to multiply by 256 (a non event as it's the high
>byte of a 16bit word) and then subtract B if you actually do want 255 rather
>than do a long multiplication by 255.

Thanks to all those who helped me see the answer to this.
Sometimes the easy (obvious) answer just needs a nudge.
I will multiply * 255 (make it high byte & decrement) and do
the division with one of the routines on the piclist.com site.

>What are you trying to calculate?

A 16 bit timer value based on the # of steps to travel & how fast to get there.
Sounds weird but hey - you asked!  :-)
Regards...

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