say i have a 16C711 (not JW) and I use an "x-ray machine", will it be =
erased? Can I use a Microwave-oven?

/Johan

----- Original Message -----=20
From: "Robert Rolf" <Robert.Rolf@UALBERTA.CA>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Friday, June 16, 2000 9:01 PM
Subject: Re: [PIC]: 16C711 JW code protection


> Marc wrote:
> >
> > Hi.  Today I have trashed two 16C711 JW devices.  Although I
> > spent a lot of attention to the code protection being set to OFF,
> > both chips reported a programming error, namely the CP setting
> > "illegal".
> >
> > Both are now not erasable anymore and ready for the trashcan.
>=20
> So try baking them in high (150C) temperature oven for a while.
> You've got nothing to loose. High temperature causes higher
> leakage and may be able to drain off the buried charge on the
> code protect bit. High temperatures are really only a packaging
> problem, and in the JW case you can go REALLY high (after all
> they fab the IC's at 1000's of degrees C).
>=20
> If you have access to an x-ray machine, try blasting them with
> low energy x-rays. That WILL remove the charge.
> Someone on this list probably knows what dose would work.
>=20