On Thu, 17 May 2001 09:50:49 -0700, James Newton wrote:

>We don't seem to have any samples of the use of TMR0 with an external clock
>source...
>
>...anyone have some sample code that does this?
>
>Is it ok to clock the TMR0 bin at a higher rate than the internal clock?
>
>Can you clock TMR0 at a high rate than the clock in the PIC can run?
>


Yes, AFAIK, you can clock it up to 50Mhz. Thats how those PIC frequency
counters work, along with a little trick that uses the prescaler as an
extension of the counter which is read by clocking TMR0 externally with
an extra output pin until TMR0 changes, effectively obtaining the prescaler
contents by keeping track of the number of pulses needed to make the
prescaler roll over.

Dan

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