You can have problems with programming some PICs (16F6XX, for example)=20
if you use:
internal oscillator
MCLR as input pin
HV programming
AND an external VDD (not controlled by programmer)

I don't know if this affects 18F parts or not.

Kerry



Matt Rhys-Roberts wrote:
> In the case of an 18F part at least, can the ICD2/ICD3 be successfully=20
> used for programming and debugging when the PIC is only intended for=20
> int.osc. use?
>
> I've only ever developed PICs with external oscillators attached, so=20
> have never needed to wonder.
>
> Thanks,
> Matt
>  =20

--=20
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