using SDCC here..

declared a variable:

xdata at 0x0 EEPROM[2048];


then in the code:

Write:
e.g.

EECON=0x02;
EEPROM[5]=128;
EECON=0;

Read:
e.g.

EECON=0x02;
MyData=EEPROM[5];
EECON=0;