> > What is the maximum (safe) voltage I can apply to an I/O pin on a
> PIC16C64?
>
> I don't know off the top of my head, but if I needed to know I would check
> the data sheet.  So can you.


It is not the Voltage which matters, but the resulting Current.

You can feed in any Voltage you wish (e.g. 240 V AC) as long as you use a
resistor sufficient to limit the current to a safe value.

Most pins have shunt diodes to the substrate and to Vcc so they can take a
few tens of milliamps.

RTFM

................................. Zim

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