I'm using a circuit similar to the one found here:
http://www.jdm.homepage.dk/icsp.htm
It's not an official microchip design, but I like it because it
isolates the rest of the circuit completely.

Will the voltage difference cause any problems?

Thanks,

Mike

Ishaan Dalal wrote:
>
> > My question: The PIC datasheet says the maximum input voltage on any
> > pin is Vdd + 0.3V.  When I use a diode to isolate the power pin, that
> > drops the PIC's Vdd by 0.7V (or 0.4V if I use a schottky diode).
>
> Why would you need a diode in series with Vdd for ICSP? I believe you only
> need to pull /MCLR to Vpp for ICSP -- /MCLR does not power the circuit.
> Check out page 33 in
> http://www.microchip.com/download/lit/suppdoc/specs/30277d.pdf -- it's a
> reference circuit for ICSP on 16F8XX PICs, and all it requires is a diode in
> series with the /MCLR RC to Vdd (Vpp is applied at the junction of /MCLR and
> the diode).
>
> Cheers,
> Ishaan
>
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