Would the HP-15C Limited Edition Firmware Age Away?

[teenix]

(03-26-2018 11:11 PM)emece67 Wrote:  

(03-14-2018 03:17 AM)jjohnson873 Wrote:  Flash memory storage for most embedded microcontrollers is designed for +100 years before the charge on the memory cell will leak enough to flip a bit.

(03-14-2018 06:32 AM)cyrille de brébisson Wrote:  Thrid, I have have not looked at the CPU doc, but I am prety sure that the ATMEL chip has a flash life which is longer than 5 to 10 years. These chips are designed to last decades, not years.

I've checked the Atmel technical documentation about the SAM7L128 and SAM4LC4 microcontrollers that (I think) are used in the HP12/15 Platinum/LE. The minimum guaranteed data retention time for the Flash memory inside these chips is of 10 years in the SAM7L128 and 15 years in the SAM4LC4.

Regards.

Probably useless info, but the PIC that is used in the MultiCalc is specified at 40 years data retention for both EEPROM and ROM (under normal operating conditions).

Seems it's going to outlast me ;-)

cheers

Tony