>
> Thanks for all the resonses. I'm sure I'll be able to use somthing.
> I am thinking I need 3 voltages. 5.0V for the inital programming, 4.5
> for the vDD min, and 5.5 for vDD Max.
> The current required is 50ma, according to the programming spec.
>
> Another question: Does the MCLR line have to change also? or can I just
> leave it at 12V for all of the operations. Since it has very little
> current draw and 12V is 4.5 or more than 5.5, the chip would stay in
> programming mode.

I believe from all the progamming speifications I've seen that MCLR must
transition from 0V to Vpp to enter programming mode. At the very least you'd
need a transistor switch from 0C to Vpp.

BAJ