Ken Pergola wrote: > The real confusing thing about all of this is that if one follows the advice > in the data sheet regarding refreshing the EEPROM, one appears to be > violating parameter D120 (ED) which is the cell endurance -- which is 10X > less than parameter D124 (TREF). It's perfectly clear to me. The D120 value is for one *specific* cell. Any cell of course, but still the total number of times *one specific cell* can be rewritten. The number of writes in D124 can be spread over any number of cells. See ? -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.