piclist 2002\10\15\191752a >
Thread: PortA problems 16f877
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face BY : Russell McMahon email (remove spam text)



> What have I done wrong?

Failed to read the archive :-)

RA4 is open drain - it needs a pullup resistor if you want to see it go high
/ source current.
It's this way so it can be pulled to high voltage (12 volts) during
programming.

Also useful for the brave for a 2 component step up inverter - inductor to
Vcc, diode to output supply (add a zener to output unless load GUARANTEES
that max allowed voltage will not be exceeded).
Never actually heard of anyone doing this but some must. Roman ??? :-)


       RM

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