Need for Backup registers > 4KBytes

tecnico23 · ‎2012-05-15

Posted on May 15, 2012 at 19:31

I wonder if someone could help me.

I need to save, to retain ''some'' variables of my applications, but the 4Kbytes from the Backup registers is too few for what I need.

So I would like to ask if there is another way to make this possible. I can't lost this information while the power is OFF.

I would like to store it in the Flash memory when the power goes back, and reload this variables when the power turns on. But I think that in the instant that the powers goes back, it it too late to store my variables in Flash.

Best regards,

A.Paiva

frankmeyer9 · ‎2012-05-16

Posted on May 16, 2012 at 13:48

Thats o.k.. I assumed the slave uC had to do with the backup storage.

But as a side note - with a second controller, you pull in a much higher complexity, especially in keeping both uC's synchronious. Not to mention parallel debugging...

alok472 · ‎2012-05-16

Posted on May 16, 2012 at 15:00

''I told I must use an slave uC, only to have more peripherals for communication and get data.''

I suggest to use higher pin count STM32. This will be a better choice than compared to another MCU. Your software may anyway remain the same.

emalund · ‎2012-05-16

Posted on May 16, 2012 at 15:10

But the number of write/read cycles is about 10^6.

WRONG, the number of erase cycles is about whatever tha datsheet states

FRAM expensive? the FM25V02-GTR (32k*8) is about $3

Erik