Re: A real question about EEPROM vs. Flash

Rich Grise wrote: 
So, I'm bidding this ultra-sweet project, and I'm studying the
data *** of the PIC18F6520/8520/6620/8620/6720/8720, and it
says, Flash: 100,000 cycles, EEPROM: 1,000,000 cycles. What
are the other differences? Is flash cheaper than EEPROM? I
have noticed that it tends to get used for program memory,
and EEPROM for data, but are there any other differences,
like, maybe program/cycle time, erase modes, that sort of
thing?

Thanks,
Rich




Many of the low end PICs can't write their own flash. Thus, EEPROM is the only non-volatile storage for them.

Flash usually starts out as 1s, and can be set to 0s. Erased flash thus contains FF. Erasing can usually only be done on a page basis, and takes a long time.

--
Regards,
 Bob Monsen

If a little knowledge is dangerous, where is the man who has
so much as to be out of danger?
                                 Thomas Henry Huxley, 1877
.