Gerhard Fiedler wrote: > ...What I thought was the special trick is to use a > 3-byte counter, write only changed cells back, and move the counter over > only by 1 byte once the lifetime is over (because it's only the lowest byte > that gets written on every count, the higher bytes get written considerably > less often and can be re-used for the next counter position). There is exact number for "considerably less often", it's 256 for the next byte. Not that much if we are talking about getting tens of millions out of 100K device. Regards, Mike -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist