RE: [PIC]: Memory Map Question

> -----Original Message-----
> From: piclist-bounces <at> mit.edu [mailto:piclist-bounces <at> mit.edu] On
Behalf
> Of PAUL James
> Sent: 09 May 2008 16:34
> To: Microcontroller discussion list - Public.
> Subject: [PIC]: Memory Map Question
> 
> All,
> 
> I have a question for the PIC community that has me stumped at the
> moment.  Here is the scenario.
> I am using an ispPro programmer from Basic Micro.  It works well, and
we
> have used it for a long time.
> We have a 16F76 in one of our systems.  I erased the program memory,
and
> reprogrammed it with different code.
> At the end of the programming cycle, I get an error that the
programmer
> can't verify location $4000.
> The top of the address space is $3FFF or at least I thought it was.  I
> looked at the datasheet, but didn't find anything
> about address $4000.  I thought it might be a system location that is
> only availabe to the device programmer at program time.
> 
> Does anybody know what is significant about this location?  When I do
a
> read, I see location $4000 is $80.  When I erase it, it still says
$80.
> It should be $FF if it is truly erased I think.  If I reprogram it
with
> the old firmware, I still get the error.  It's like the bit is stuck
> high.  It can't be
> programmed low.
> 
> Anyway, if anyone has any insight, let me know.   I would appreciate
it.

Is it possible your hex file contains addresses past the end of the
PIC's memory, and the programmer is blindly attempting to program them?

Mike

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