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'max voltage on 16c84 RA4'
1998\01\01@114400 by wouter van ooijen

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I try to make a 16c84 programmer using another 16c84.
I switch the programming enable voltage by shorting it to ground
(It has an impedance of 10K).
As far as I can see I need a separate transistor for this,
because the specs require the voltage all pins
(including RA4) to be no higher than VDD.
But during programming MCLR is held at the programming voltage,
so at least for that pin >VDD is allowed.

So my question is: what voltage can be put on RA4?

1998\01\01@140014 by John Payson

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> But during programming MCLR is held at the programming voltage,
> so at least for that pin >VDD is allowed.
>
> So my question is: what voltage can be put on RA4?

According to a rep at Microchip, the max voltage on RA4 for the 16F84 etc.
is 14V independent of VDD.

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