[DM648]How to write data to ROM during runtime and read it when enter the program next time?

Hello,

I have a question about how to write/ read the result of program..

What I want to do is

(1) Save the result of the program to somewhere, such as flash, in runtime.

     Then stop the program.

(2) Next time, when I enter the program, use the data I saved last time to run the program.

Thank you very much!