HI.
Just so there isn't any missunderstandings...

Chen Xiao Fan wrote :

> My guess is that Vpp are not really controlled in
> most JDM units...

Since you mentioned the Wisp628 in the paragraph before,

Note that the Wisp628 doesn't do that either "as-is".
It needs a few extra components (as outlined on Wouters
Wisp628 page), and then it simple shorts Vdd to GND
a short period, which in itself puts some constraints
on the power supply (no PSU with "soft-start-", not
to many uF's on-baord). A 7805 based PSU with a few
10's of uF has usualy worked for me.

I've been re-selling Wisp628's in Sweden for a couple
of months, and I've had *three* customers locking themselfs
out from 12Fxxx since then. All of them using the blink-a-led
test program (using intosc and int-MCLR) from Wouters page...)
And since these are all PIC-beginners, well, it's not the
best start they could get... :-)


Jan-Erik.



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