title: How to use Backup SRAM as EEPROM in STM32F4
body: <p>There are two ways of emulating EEPROM on the STM32F4:</p>
  
  <ol>
  <li>On-chip 4 Kbytes backup SRAM </li>
  <li>On-chip Flash, with specific software algorithm</li>
  </ol>
  
  <p>The second option is described here: AN3969. </p>
  
  <p>But google, unfortunately, hasn't been able to provide information on how to use the first option - using the 4Kb of backup SRAM as EEPROM?.. </p>
  
  <p>Can anyone help on the topic?</p>