I did this for fun a while back.  It uses buttons to trim the add/
delete pulses per time block... if the average temperature is fairly
constant then the average clock speed is as well.  It has a 0.125ppm
trim resolution with a +/-32ppm trim range.

http://www.tayloredge.com/reference/Circuits/ClockDivider2/SimpleClock_PIC12F675.jpg
http://www.tayloredge.com/reference/Circuits/ClockDivider2

jt

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