On 12/7/07, Forrest W Christian <forrestc@imach.com> wrote:
> I have a couple of designs which require a 3.3V Vdd.
>
> CCS ICD-S20   (The USB version of this one is the one which is broken).
> Mikro-E PicFlash2
> Microchip PicKit2.
> So, the question is this:  How in the (*@#$ do I configure a 3.3V target
> so I can program it from the entire crop of 5V programmers that I have?
>

PICkit 2 and Microchip ICD2 will work for most of the PICs with 2.5V to
5V supply.

For PICkit 2, read the user guide and use the configuration of Figure
3.1 (it might be better to use a Schottky diode). You still need to
connect the target Vdd (3.3V in your case) to PICkit 2's Vdd connection.

There may be a problem with some PICs which need above 4.5V
for bulk erase and do not support low voltage row erase. In that
case, you need to isolate the PIC Vdd vltage from the rest of
the circuits.

Olin's ICSP guide is good.
http://www.embedinc.com/picprg/icsp.htm

Xiaofan
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