Microchip ICD3 supports 12V on MCLR ?

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Hi,
I have the ICD3 and I need to program a 12F683. The thing is, that I really need one extra pin, so I need to use the GP3/MCLR/VPP pin as IO. My question is, can the ICD3 generate 12V on MCLR to program the PIC? I've been through the user guides, but I cannot find this info.

Best regards,
George
 

Hi,

To program that chip the programmer, ICD3 or whatever, applies 12v to Vpp.

If you are doing ICSP then you will need to protect your i/o signal from the 12v vpp from the programmer - dependant on the signal / input or output this may or may not be possible electronicaly.

Attatched is the Pickit2 programmer ICSP diagram / example - here showing how a Mclre Pull up is isolated from Vpp.

The other simpler way may be to have a little manual switch on that pin to isolate your i/o circuitry while programming
 

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