On Wed, Apr 30, 2003 at 05:17:20PM -0500, Picdude wrote:
> 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 debug
> mode on the SW which manual exercises the pins (that go to the PIC), and all
> 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 directly to
> the port.
>  - Both Vss pins connected to ground.
>
> But alas, same prob.... says pic is protected and needs to be.  Erasing does
> not help any.
>
> I'm stumped, and really don't want to assume I have a batch of bad pics here.
>
> Any other clues?

Software? Are you using something specifically targeted to the 16F872?

I can't remember if you're testing with Linux or Windows. If linux try
taking a crack with my version of Brian Lane's picprg2.3d. Find it on my
page: http://www.finitesite.com/d3jsys#SOFTWARE

There's also a link to David Tait's FPP in that section too.

I know for sure that the bulk erase sequence is different for the 16F87X
chips as opposed to the 16F84. So pp (I think that's what you mentioned) may
be falling down on the bulk erase.

BAJ

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