piclist 2001\01\26\083653a >
Thread: Eeprom
www.piclist.com/techref/microchip/memory.htm?key=eeprom
face picon face BY : Olin Lathrop email (remove spam text)



>>
Are there a limit to to read/write operations to a pic16f84... in other
words, can I read/write to Eeprom say 4 times per second to "save" the
status of my pic actions in case of a power failure so that the pic can left
of where it stoped? Will the lifetime of the pic be reduced?
<<

Yes.  The lifetime of the EEPROM is specified by the number of write cycles.
For example, if the EEPROM is rated at 1,000,000 writes and you do 4 every
second, then the EEPROM could fail in less then 3 days.

If you need this kind of feature, you could try an external battery backed
CMOS static RAM, or arrange for the PIC itself to be battery backed and
asleep when the unit is "off".


*****************************************************************
Olin Lathrop, embedded systems consultant in Devens Massachusetts
(978) 772-3129, spamolinspamspam_OUTembedinc.com, http://www.embedinc.com

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