RE: [PIC]: Memory Map Question

Michael,

No, because the firmware file I am attempting to program is the file we
read from the unit.
We just went in and modified a few bytes to patch a particular portion
of the program.  But 
The patch we made was at the beginning of the file, not anywhere near
the end of the file which
Goes up to $4015.   It seems to me that this address just about has to
be some processor specific
Setup information location, and not a program space location.  Something
like maybe the CONFIG 
Register or maybe the OSCILLATOR control register or some such.  At
least that's my guess.

Thanks for the repsonse, and if you have any futher ideas or
suggestions, please pass them along.
I'll take all the help I can get.

	
Thanks and Regards,

	
Jim  

-----Original Message-----
From: piclist-bounces <at> mit.edu [mailto:piclist-bounces <at> mit.edu] On Behalf
Of Michael Rigby-Jones
Sent: Friday, May 09, 2008 10:49 AM
To: Microcontroller discussion list - Public.
Subject: 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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