I am talking about **Vpp**. What I mean is the Vpp voltage is rather=20
constant=20
for Wisp628 yet those JDMs will probably have big variations.
 As for the Vpp/Vpp sequence, it is not probably not so easy for ICSP=20
programmers if no Vdd control is possible. However ICD2 does not
even properly program the standalone 12F629 with internal MCLR and=20
RC oscillator configuration.
 Regards,
Xiaofan

 On 9/11/05, Jan-Erik Soderholm <jan-erik.soderholm@telia.com> wrote:=20
>=20
> HI.
> Just so there isn't any missunderstandings...
>=20
> Chen Xiao Fan wrote :
>=20
> > My guess is that Vpp are not really controlled in
> > most JDM units...
>=20
> Since you mentioned the Wisp628 in the paragraph before,
>=20
> 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.
>=20
> 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... :-)
>=20
>=20
> Jan-Erik.
>=20
>=20
>=20
> --
> http://www.piclist.com PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
>
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist