Re: 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@... [mailto:piclist-bounces@...] 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@... [mailto:piclist-bounces@...] 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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