I think that the appeal of the 32.768khz oscillator is that the DS32khz
TCXO from Maxim uses this frequency. The jury is out on if even a well
calibrated crystal will be more accurate than the coming line frequency
changes (we'll see how bad they are... )
-Adam
Digikey sells a 3.93216 MHz crystal; that divides into 60 Hz 2^16
times, which is easy to do if the microcontroller has a 16-bit timer.
Or even with a plain logic chip or two.
Brian Poi
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