On 6/29/06, Wouter van Ooijen <wouter@voti.nl> wrote:
> > > Stef, I hope you do have decoupling cap(s) (at the very
> > least one 100nF)
> > > on the power pins directly at the target chip?
>
> > hi Wouter, I didn't ....
>
> Just remember to try this when you run into (other) trouble. I dunno
> whether your 25 cm would cause a problem or not, but I certainly had
> reports that omitting the decoupling at the target caused problems.
>
> Wouter van Ooijen

The bypass capacitor and cable can be the issue here. I had problems
with 18F4550 with xwisp2/Wisp628 when I was testing xwisp2 beta versions
last year. Adding the bypass capacitor and shortening the cables solved
the problems.

This problem affect PICkit 2 and ICD2 as well. Now I am using a
universal programming adapter where the bypass capacitors are
already in. The picture of the adapter is here:
http://www.pic16.com/wzcapi/mcd2/ad01.jpg

Here is one related thread.
http://forum.microchip.com/tm.aspx?m=170399

Regards,
Xiaofan
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