Steven Kosmerchock wrote:
>PICsters,
>I was reading about the TMRO on the PIC and I was wondering about
>the clock it uses to divide using the prescaler. If I select the
>internal clock, does it use the input frequency (4MHz OSC) or the
>1MHz clock that the PIC instructions run at? Also, if I select an
>external clock of say 32KHz, will it use that frequency inputed
>into the prescaler or is their a divide by 4 their as well?
>Thanks in advance

It uses the instruction clock rate, which is the oscillator frequency /4.
The external clock will be used straight.

One word of caution, whenever you write to the TMR0 the prescaler is
cleared. This does result in a more accurate single time until overflow, but
if you are trying to also keep track of longer term time you will lose on
average 1/2 of the prescaler ticks per write.

Chip Weller