> 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

If you can afford the frequency tolerance, it might be a good time to
look at your new found friend, the ceramic resonator. Layout for a 3
terminal version and plug in whichever frequency you need. They
are more forgiving to stray everythings than a crystal circuit.

Steve.

======================================================
Steve Baldwin                Electronic Product Design
TLA Microsystems Ltd         Microcontroller Specialists
PO Box 15-680, New Lynn      http://www.tla.co.nz
Auckland, New Zealand        ph  +64 9 820-2221
email: steveb@tla.co.nz      fax +64 9 820-1929
======================================================

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