Okay, I'll buy that, and will adopt in my designs from now, but...

I'm still suffering here.  PCB version checks out okay, including the deb=
ug=20
mode on the SW which manual exercises the pins (that go to the PIC), and =
all=20
checks out fine.
 - Voltages are perfect now -- 5.04V and 13.4V f/MCLR.
 - I've pulled RB3/PGM low by jumpering to ground.
 - Eliminated the cable as a suspect, by connecting the programmer direct=
ly to=20
the port.
 - Both Vss pins connected to ground.

But alas, same prob.... says pic is protected and needs to be.  Erasing d=
oes=20
not help any.

I'm stumped, and really don't want to assume I have a batch of bad pics h=
ere.

Any other clues?

Cheers,
-Neil.




On Wednesday 30 April 2003 16:36, Olin Lathrop scribbled:
> > I found the reference to this in the datasheet -- DS30221B, pg 102,
> > section
> > 11.18.  Says "Note 1:  The High Voltage Programming mode is always
> > available, regardless of the state of the LVP bit, by applying Vihh t=
o
> > the !MCLR pin."
>
> You should look at the programming spec for these kinds of details.  I
> have personally seen some PICs act flaky when LVP was high, even though
> PGM was properly pulled high to Vpp.  If I remember right, some
> programming specs tell you that LVP should be low, others don't mention=
 it
> specifically.
>
>
> *****************************************************************
> Embed Inc, embedded system specialists in Littleton Massachusetts
> (978) 742-9014, http://www.embedinc.com

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