Christoph Klein <PICLIST@MITVMA.MIT.EDU> wrote:

> I would like to measure time intervals which are presented to
> a Pic16C84 (possibly) as short TTL-compatible spikes.
> Supposing that measuring the interval would be the pic's only task:
>
> What would be the best time resolution I could expect using a
> 4 MHz pic with a Xtal?
>
> And how about accuracy?
>
> Is there a chance to measure with a resolution in the msec range or
> isn't there? I haven't got a clue ...

Christoph:

Millisecond resolution is no problem whatsoever... In fact, you can
measure the intervals to a resolution of better then 5 microseconds
at 4 MHz, with fewer than a dozen lines of code.

Accuracy will be dependent upon the precision and stability of your
crystal, but even the cheapest crystals will give you better than
0.01% accuracy.

-Andy

=== Andrew Warren - fastfwd@ix.netcom.com
=== Fast Forward Engineering - Vista, California
=== http://www.geocities.com/SiliconValley/2499