On Tue, 7 Dec 1999, Gennette Bruce wrote:

> This is built in to the 16F84 -  as 64 bytes of EEPROM.
>
> There are 3 special registers, some flags and a couple of special codes to
> pass around for sending bytes to/from the EEPROM.  Microchip has examples on
> their site which you must follow exactly (about 8 lines for a write, 6 lines
> for a read).

Correct.
>
> This EEPROM is not as versatile as flash RAM; its slower and can only stand
> 10,000 or so writes, with billions of reads (at least several orders of
> magnitude less cycles than RAM).  All the following numbers are VERY
> conservative, but better safe than sorry.
>
 Nope. Mchip guarantees a million of write/read cycle or so. The limited
number certifies the program flash memory which is completely different
from that data EEPROM
 >
> External EEPROM chips have the same limitations, but being larger the
> programer can extend the apparent write cycles. You may choose to write to
> each byte say a conservative 2,048 times, then change to other bytes before
> these fail.  Using just an 8 byte block on a 2K chip at 2,048 write cycles
> per block gives 524,288 writes.

I am not sure whether this limitations are valid for Mchip products. I
guess no. See ANxxx referring to the topic 'endurance'.

Regards,

Imre