> > RA4 does not have such a diode as it is used as the high
> > voltage 9+12v ish) programming voltage pin.
>
> A bit confused? HVP uses /MCLR, not RA4.

Whoops & indeed :-)
OK - so they chose to make RA4 higher voltage capable for no good reason
then perhaps. In any case, the point here is that MOST IO pins do not allow
you to take them more than a diode drop(less if operating normally) above
Vdd.


        RM

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