Re: A real question about EEPROM vs. Flash

On Fri, 22 Jul 2005 00:21:55 +0100, Svilen wrote:

> A lot of differencies, starting from the physical effect. Flash is based
> on the effect of hot electrons (if I remember correctly) and by nature
> it is a descructive effect, that is not the case with the EEPROM. Flash
> basic cell is much smaller that the EEPROM one, however the periphery is
> much much bigger, that's why the chips are cost effective for big amount
> of memory. With EEPROM should be the opposite. The other big difference is
> the erase/write time - much shorter(faster) for the flash, but always on
> blocks - i.e. a single cell can't be erased/programed. This is not a
> limitation for the EEPROM, but the write/erase time is is much slower.
>
> Hope this helps

Yes, considerably!

:-)
Thanks!
Rich

> Svilen
>
> 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
>>
>>
>>

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