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Need for Backup registers > 4KBytes

tecnico23
Associate II
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
12 REPLIES 12
frankmeyer9
Associate II
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
Associate II
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
Associate III
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