8051: writing to memory in the program

I'm learning the 8051 type microcontroller now and using the Atmel
89s52 microcontroller. There are 2kb of RAM and 8kb of flash memory.

I'd like my program to be able to write some data to memory while
running, so these data can be remembered when power down and can be
retrieved at power up.

Is there a way to do it? How do I do such a write with embedded c?

Thanks

.

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