Power up a microcontroller with pre-power-down data

Posted on Apr 22, 2012

It is sometimes necessary to retrieve data at power-up in the same way that they were at the last power-down, so that the product wakes up in the state it had before shutdown or to retrieve some measurement. One approach is to save critical variables into EEPROM or flash memory as soon as they change. This approach is generally not a good idea, because flash is typically limited to 100,000 write cycles, and EEPROM is typically limited to 1 million cycles.

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