Mike asked:

> We need in circuit programability and we curently use a PRO MATE
> with the ICSP module.  Is this going to work for 3.3 volt parts?

I'm not aware of those parts being 3.3 V only. I thought they were
guaranteed to run at 3.3 V to 5V, in which case you can program them
with Vdd at 5 V.  BUT, this might prove a challenge for in-circuit
programming though, if the rest of the board can't be at 5V.

>  It looks as though Vdd can be adjusted from within the programming dialogue in MPLAB.
> Has anyone tried this?

Well, typically, programming is done at nominal Vdd, and verifies are
performed at both high Vdd and low Vdd to make sure that the
thresholds are all programmed right.  I have used that feature to
make sure that the verifies were done at the right "high" and "low"
voltages for my 16LC76.  I want to make sure it will keep running a
3.3 V, even though I program at 5 V (out of circuit).

Sorry, I don't know how Vdd is set for parts with 5 V only
programming, does the "Vpp" setting change Vdd during programming?
The docs I have use an example with Vpp = 13V!

FWIW,

Barry
------------
Barry King, KA1NLH
NRG Systems "Measuring the Wind's Energy"
http://www.nrgsystems.com
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