I am currently working on a gadget with a 12C508.  Three I/O pins (GP0, GP1 and GP4) are set as outputs and are used to provide a 'clock pulse' to some other circuitry.

When used in the field, any or all of these pins could be used, but probably only two at a time.

Should anything be done with these pins that aren't used?  They will be 'running' all the time, whether the signal is used or not.  Perhaps tie them to ground through a 10K resistor?  Or maybe they're fine left open?

What about unused I/O pins that aren't referenced in the program?  Should anything be done with them?  I'm basically trying to limit long term damage (re: my post about the life expentancy of a PIC).

Thanks for any input!

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