Quoting Bob Axtell : > > 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 Apparently this same problem occurs in SSDs, requiring refresh cycles. >> 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 >> >>> 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 > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist