> I can't see now a simple switch to ground and a 10K pull up to Vcc and a
small
> capacitor are going to create voltage spikes below ground that can pump
> 80mA of current into the MCLR pin.  Even with a several inches of wire to
the
> switch I doubt there would be enough inductance about to cause problems.

The cap can!

> Is the MCLR input any different in this respect to other pins ?

Yes, it does not have the normal protection diode to Vcc (because it must
accept the ~14 V Vpp). I guess RA4 is similar.

Wouter van Ooijen

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