>
> I'm not sure it applies to this part, but I know the 12F parts
> are sensitive to Vcc risetime, which
> can cause problems when there is capacitance or other loading on
> the supply.
>

Thank you for the tip Mike. I've checked this with power from the ICD2 - It
takes 15us for the Vcc pin to reach 2V, and a further 80us to reach 4.5V.

When I use power from the board instead, the waveform of the rise of Vcc is
much more drawn out - Vcc takes 1ms to reach 1.4V, then climbs quicker to
2.6V in a further 40us, and then slowly again to 3.3V (full voltage in this
configuration) in a further 2.5ms. Maybe this is due to characteristics of
the bench power supply.

Could these kind of risetimes for Vcc be significant with the
erasing/reprogramming problems? Whichever source of power the trouble is the
same.

Thanks,
James

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