Any idea what sort of accuracy I should get from a cheap watch xtal in a
PIC oscillator?

I'm using one as the T1 osc on a '877. I let the timer free-run (I don't
preset it - it rolls over in 2 seconds), and have an interrupt routine that
keeps track of time-of-day. When I compare the time of day from this with
the actual time, the PIC has lost about 6 seconds in 8 hours. Not very good.

Larry

Larry Bradley
Orleans (Ottawa), Ontario, CANADA

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