Yes you can do ICSP like that. I have not done LVP, but you can bring
out MCLR if you use a diode and resistor to Vdd. IIRC the Tait still
needs to be able to reset the PIC (Vdd on, Vpp off). If you only use a
diode, then the Tait will pull Vdd high and Vpp low causing the diode
to short or at the very least keep Vpp  high.

You can reuse the programming pins if you isolate them from the rest of
your circuit. It totally depends on what you tie them to, but often a
high value resistor works.

- Ben

On May 24, 2004, at 7:57 AM, Anthony Toft wrote:

> I am designing a new circuit for a hobby project and am thinking about
> a couple
> of new concepts, however I can't find the "yes, this is how youdo it"
> answers
> I'd like...
>
> I want to do ICSP, is this simply a case of providing a header to the
> programming pins, or am I mistaken? The PIC I am using (16F876a) has
> enough pins
> spare that I can afford not to reuse the pins for IO...
>
> Along these lines I am thinking of using LVP, if I have a switch to
> set the LVP
> pin to the right state, can my tait style programmer accomplish this?
> If it
> can't how should I isolate the MCLR\ (tied to Vdd for normal use) when
> I go to
> program? will a diode(pointing towards MCLR\) to the trick or will the
> voltge
> drop confuse the issue?
>
> Thanks for any and all comments
>
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