How to use flash for data storage in SST P89V51RD2.

I want to use only 1 KB memory as data storage from the flash memory of the SST 89E516RD. I have no idea about how to erase and write into flash for data storage. In the 89E516RD there is some thing written in datasheet as ROM : 64 + 8 KB . But I can't understand it. Also mention how to reserve some memory from flash for data storage. Please provide sample code if possible.
Thanks.

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