Hi. I have a serious problem. 
After power on my product, I have found the data saved in EEPROM are
changed.    
I used PIC16F877A, ATmel 24C64A(EEPROM, 2.7~5.5V) and Vcc 3.6V supplied.  
Code for writing EEPROM is as follows;
void write_ext_eeprom(long int address, byte data)
{
i2c_start();
i2c_write(0xa0);
i2c_write(hi(address));
i2c_write(address);
i2c_write(data);
i2C_stop();
delay_ms(10);
}


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