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What are different types of memories in M221

Below are different types of memories in M221
RAM  > Execute the application and contain data
512 Kbytes of RAM memory: 256 Kbytes for internal variables and 256 Kbytes for application and data

Non-volatile > save the application
1.5 Mbytes, of which 256 Kbytes is used to back up the application and data in case of power outage.

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