Michael Gois wrote:
> Have just had a look at my datasheet for a PIC16F87x and on all block
> diagrams for all I/O ports they say they have protection diodes..
> I would say it's a safe assumption that all PICS would have them but
> it only takes 2 minutes to check the datasheets (look for the chapter
> on I/O ports), on all the block diagrams for the I/O ports it says
> "Note 1. I/O pins have protections diodes.." so just look for that on
> the diagrams..

The open drain output line (usually RA4) doesn't have a protection diode to
Vdd, and neither does MCLR.  This is an issue since on some processors MCLR
can be configured as an input pin.


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