Thanks Bruce,

After a little bit of fiddling (merely just trying to erase them to start
from scratch), I was able to blank them out and start programming them
again.  I appreciate the advice, it definitely helped me along.

I'll disable LVP.  I guess there's not much of a reason to enable it, since
the firmware shouldn't need to be programmed without the programmer I have
anyway. Are you of the opinion I should keep _MCLRE_ON on just for these
types of issues?

-Eric

On Sat, Nov 14, 2009 at 3:47 PM, Tech <tech@rentron.com> wrote:

> > Don't recall ever setting MCLR in the programming interface, or in the
> asm
> > file, but who knows.  If I did, it was accidental within the programming
> > interface.
>
> _MCLRE_OFF in your config settings line disables external reset.
>
> > The configuration is set as follows:
> > __config _CP_OFF & _DATA_CP_OFF & _LVP_ON & _BODEN_ON & _MCLRE_OFF &
> > _PWRTE_ON & _WDT_OFF & _INTRC_OSC_NOCLKOUT
>
> You might want to change _LVP_ON to _LVP_OFF if you're not using
> low-voltage
> programming. I suspect that's one issue you're having now.
>
> > I did manage to salvage one of the chips that were unrecognizeable, using
> > some combination of checking communication with VPP set, and then erasing
> it
> > in normal programming mode.  Not sure exactly what the combination should
> be
> > for restoring it to working order, but I still have two that are messed
> up.
> > What exactly should I be using to fix this?
> >
> > I seem to see that others are having this exact problem, which tells me
> it's
> > not out of the ordinary.
> >
> > I hadn't been powering VDD to the target during programming, but maybe
> the
> > scenario existed where I accidentally left it on after testing a little
> > bit.  Ideas?
>
> This might help you salvage the ones you're having problems with.
>
> Power the PIC from the PICkit2 for programming.
> Change _LVP_ON to _LVP_OFF in your config line.
> Ground RB4 (LVP pin) with a 10K or more resistor to ground
> Select the Use VPP First Program Entry under the Tools menu.
>
> Now see if you can reprogram them.
>
> Regards,
>
> Bruce
>
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