On 7/23/2011 3:53 AM, Jan-Erik Soderholm wrote:
> I see from the schematics in the PICkit2 manual that it has hardwired
> 4.7 Kohm resistors to GND. So the target curcuit has to be able to
> handle that at least, if one want to have the PICkit2 connected.
> True trisate drivers might have been better.
Well, that would be the reason - isolation is in the form of a series=20
resistor with the rest of the circuit, chosen to still permit operation=20
of the circuit in normal cases, but  still allow the ICD programmer to=20
drive the pins regardless of the situation.    Unfortunately, with the=20
4.7K to ground, well, the voltage divider effect took effect....

Quick snap open of the PICKIT2, and removal of the offending '472'=20
resistors and all is well.

Thanks to all!

-forrest

--=20
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