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> This is my scenario: I've built a kind of chess-clock using a
> 32768Hz-crystal as Timer1-oscillator. The device is able to measure up
> to 90 minutes of time, that is - this is the longest measured period
> the device should be able to handle. I'm not interested in uS-accuracy
> - some 1ms clock-drift is not fatal - but I don't want 2 seconds
> drifting. You probably get the idea.
If you have a seperate timer crystal you really shouldn't need the main clock on a crystal as well because you aren't using the main clock for timing.



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