Daniel,

Use the movx instruction instead of the (*(char xdata *)addr) line in C. In other words, something like the assembly version of the c code:

char eeprom_read(unsigned int addr)
{
char eeprom_data = 0;
eeprom_data = (*(char xdata *)addr);
-movx A,@Ri
-mov Rn,A
return eeprom_data;
-ret Rn
}

void eeprom_write(char data_value, unsigned int addr)
{
WMCON |= 0x10; // Set the EEMWE bit to start a write to EEPROM.
-setb #EEMEN
(*(char xdata *) addr) = data_value;
-mov A,#data
-movx A,@Ri,A
WMCON &= ~0x10; // Clear the EEMWE bit to finish write.
-clr #EEMEN
}

Clint