union {
       int ival;  
       unsigned int uival;      
       byte bval[2];
      }tp;


    
        tp.uival = 812;
        WriteByteToEEPROM(400, tp.bval[0]);  
        WriteByteToEEPROM(401, tp.bval[1]);  


        tp.bval[0]=ReadByteFromEEPROM(400);
        tp.bval[1]=ReadByteFromEEPROM(401);                  
        Out_digit_LCD(1,1,(tp.ival)*10,0,8);

        WriteByteToEEPROM(400, 12);  
        WriteByteToEEPROM(401, 78);

        Out_digit_LCD(1,1,(ReadByteFromEEPROM(400))*10,0,8);  
        Out_digit_LCD(2,1,(ReadByteFromEEPROM(401))*10,0,8);

void WriteByteToEEPROM(int Address, byte Data)
{
    // Wait for completion of previous write
    while(EECR & (1<<EEWE))
    // Set up address and Data Registers
    DisableInterrupts();
    EEAR = Address;
    EEDR = Data;
    /* Write logical one to EEMWE */
    EECR |= (1<<EEMWE);
   /* Start eeprom write by setting EEWE */
    EECR |= (1<<EEWE);
    EnableInterrupts();    
}


byte ReadByteFromEEPROM(int Address)
{
    /* Wait for completion of previous write */
    while(EECR & (1<<EEWE))
    // Set up address register
    EEAR = Address;
    /* Start eeprom read by writing EERE */
    EECR |= (1<<EERE);
    // Return data from Data Register
    return EEDR;
}