John Walshe wrote:
>
> Hi guys,
>     I'm considering a situation where I would clock timer1 in external mode,
> driven by a copy of the Xtal output pin, in order to gain a bit of
> resolution when capturing the width of a pulse using the capture register.
> The Xtal frequency is 4Mhz, giving a pic clock of 1us which just a little
> too slow. I am hoping to have a resolution of 250nS by using the above
> method.
>
> Has anyone tried this? Are there any gotchas that anyone is aware of?


Hi John, since you are measuring high speeds,
why not just count the number of incoming
pulses during a set period? That will average
to give you as fine a resolution as you want.
-Roman

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