> RA4 is open collector when used as an output

Some PICs have the high-side FET on RA4 so it can drive high
rather than "float" high. It caught me out when a circuit based on
an F88 (has the FET) was ported to an F628 (doesn't). So you
have to watch the RA4 voltage too. Open collector RA4 spec is
a lot higher, 14V vs Vdd + 0.3V


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