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Alain,
Darrel's great example uses one crystal mine uses 2. And oh if something is sitting there soldered to the dev board and you don't have code to see if it works!!

Thank you Bruce
Smaller, tighter, yet perfect speed. Started the clock last night with your change and so far the PIC18F452 has not gained or lost one second.
Tim C

The earlier versions I wrote had NO asm but lost almost a minute an hour. To make up for that one could re-tune using TMR1H and TMR1L with a larger value. Problem is every change made to the...

Looked all over trying to find an example with a second crystal connected to the TIMER1 overflow. This example uses the earlier 18F452 version of the Olimex PIC-WEB board. Ran the clock for a day...