> Em 21/2/2011 09:46, IB Peter Feucht escreveu:
> > no, there is only one initial eeprom write during flashing the PIC, the=
n
> > only once again if mode is changed, which usually never happens and if,
> then
> > months or even years may have gone by. As said, I'm initializing cell #=
0
> to
> > $00 for mode 1 and that's it.
> >

>=20
> EEPROM (and other members of EPROM family) more usual failure mode is
> "0" bits reverting back to "1" due to charge leakage.
>=20
> You may have one or more "0" bits turning to "1".
>=20

If the EEPROM bits always fails from 0 to 1, the OP should use FF for mode =
1=20
instead of 00. That would be a fix for this particular application and use =
of=20
the EEPROM.

/Ruben

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D
Ruben J=F6nsson
AB Liros Electronic
Box 9124, 200 39 Malm=F6, Sweden
TEL INT +46 40142078
FAX INT +46 40947388
ruben@pp.sbbs.se
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D

--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.