> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
Behalf
> Of Bob Axtell
> Sent: Thursday, February 09, 2006 2:47 PM
> To: Microcontroller discussion list - Public.
> Subject: Re: [PIC] question from someone new to the list
> 
> I know your business well. I designed an early player card system for
> Deadwood.

It's a fun industry.  I was in telecomm mostly for some 15 years but
that is really pretty boring.  "Whee the LED is on!"  
 
> - - -
> 
> In several designs, I experienced problems with the PIC16Fxxx
EEPROM's.
> No,
> the -A version is just as bad. So much so that I try NOT to use them.
> But, if I have
> to...
> 
> what works is to write an algorithm that writes the variable in 3
places
> in EEPROM,
> then when one of them has a dropped bit (best 2 of 3) when the
variable
> is read out,
> I rewrite all 3. It increases a 20 word routine to about 50 words, but
> it works well.

Same approach was used by our contractor on another product he did.  And
we use it on the NVRAM of the main processor.

If it was only a dropped bit or two, I'd go with this but it is turning
three bytes into all zeros not just a corruption of the byte.

> 
> On the other hand, if you can store the variables in program space,
you
> only need
> to do it once. THAT flash array always works fine.

It might come to that but we are apparently running out of code space
according the contractor.

But can you change three bytes in Flash while the chip is running?  I
gotta learn more about these processors.

Thanks,
Bill


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