Robert James Kaes wrote :

> I have a bit of a question regarding the EEPROM specifications for an
> 18LF248.  The datasheet states that the data EEPROM has a "Number of
> Total Erase/Write Cycles to Data EEPROM before Refresh" of 1M to 10M
> cycles, and a "Number of Total Erase/Write Cycles before Refresh" of
> 100K to 1M cycles.
>=20
> What is the difference between these two values?  One is=20
> Param D124 and   [40=B0C to +85=B0C]      <<<=3D=3D=3D
> the other D124A.  [+85=B0C to +125=B0C]   <<<=3D=3D=3D

At least in *my* data sheet...

> Also, if I refresh the EEPROM before either limit, can the EEPROM
> continue to function without fail "forever"?

No, for each *single* EEPROM cell, the D120/D120A value is the limit.

> The current application I'm using this on increments a variable in
> EEPROM approximately once every two seconds.  Every eight=20
> hours I do an EEPROM refresh.

Do you have *other* values in the EEPROM (not written every
two seconds) that need a refresh ?

> I just want to make sure that the PIC's EEPROM will
> continue to work for years without a problem.

Well, you are stuck to whatever the params D120-D124 says anyway.

Jan-Erik.




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