Does anyone know the internal structure of a PIC's oscillator
section ? I'm trying to sort out a circuit that can have a crystal
and a pair of caps plugged in that doesn't require tuning, and
works over the range of 4-20MHz. I've tried both of the circuits
suggested by MC for parallel/series crystals but so far neither
is flexible enough or needs fiddling with over the full range of
crystals that a PIC (or indeed any other micro) will accept

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