This is only for the PICs. The external EEPROMs are, frankly, bulletproof.

Microchip has released a weasel-worded solution, but it it makes almost no
sense to refresh all of the cells needlessly.

--Bob A

> Bob,
> I didn't experience this problem (yet) but it is good to know. I
> understand
> this is for the EEPROM part of the MCU and not for the FLASH, correct?
> Is this a problem on the "external" I2C EEPROM series from Microchip as
> well
> or only on the nanowatt MCU series?
>
> TIA
>
> 2009/9/30 Bob Axtell <engineer@cotse.net>
>
>> David, this is pretty common in the "nanowatt" series of PICs. This is
>> caused by weaknesses in the EEPROM
>> manufactrung process. It turns out that, unlike the older PIC16C/18C,
>> there are now severe limitations on the
>> number of times the EEPROM cell can be read before being refreshed.
>> Unfortunately, frequent refreshes reduce
>> the useful lifetime of the EEPROM cell.
>>
>>
>
> --
> Ariel Rocholl
> Madrid, Spain
> --
> http://www.piclist.com PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
>


-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist