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

[emece67]

(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.