On Wednesday, July 11, 2001 6:40 PM, Wouter [mailto:wf@XS4ALL.NL] wrote
>
> The 'normal' PIC pins have a protection diode to Vcc, so you
> can not use 'm
> to switch a voltage greater than Vcc. (not even using a
> simulated open-drain
> by switching the direction). So with such a pin it would not
> be possible for
> me to create my programmer (which switches the Vpp using a
> PIC pin - RA4 of
> course). So uChip included - for my joy - one pin without the upper
> protection diode, that can withstand a voltage up to 14V. I
> guess the upper
> driver FET would not like being reverse-biased, so they had
> to make it open
> drain. In't it great that I had such an impact even before I
> knew what a PIC was?
>
If i remember correctly, Microchip has revised the specification in the
errata.
RA4 can withstand up to 10V.
Correct me if i'm wrong.

Frank

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