RTC DS1307 Backup battery

void I2Cread(){
		for(i=0;i<8;i++){
        I2CStart();
		I2CSend(0xD0);							/* Send slave address with write */ /* Send address for dummy write operation *//* this address is actually where we are going to read from */					       						       
        I2CSend(0x00);							/* Send a repeated start, after a dummy write to start reading */
        I2CRestart();
        I2CSend(0xD1);							/* send slave address with read bit set */
 
			
      			I2CData[i] = I2CRead();			/* read a byte */								/* ACK if its not the last byte to read */             	 
 
        }
		 	I2CStop();							/* Send stop */
}

void I2Cread(){
		
        I2CStart();
		I2CSend(0xD0);							/* Send slave address with write */ /* Send address for dummy write operation *//* this address is actually where we are going to read from */					       						       
        I2CSend(0x00);							/* Send a repeated start, after a dummy write to start reading */
        I2CRestart();
        I2CSend(0xD1);							/* send slave address with read bit set */
 
				for(i=0;i<8;i++) {
      			I2CData[i] = I2CRead();			/* read a byte */								/* ACK if its not the last byte to read */             	 
 
        }
		 	I2CStop();							/* Send stop */
}

void I2Cread()
	{
        I2CStart();
		I2CSend(0xD0); /* Send slave address with write */ /* Send address for dummy write operation *//* this address is actually where we are going to read from */					       						       
        I2CSend(0x00); /* Send a repeated start, after a dummy write to start reading */
        I2CRestart();
        I2CSend(0xD1); /* send slave address with read bit set */
 
		for(i=0;i<7;i++) 
			{
      			I2CData[i] = I2CRead(); /* read a byte */ /* ACK if its not the last byte to read */             	 
 				I2CAck();
        	}
		I2CData[i] = I2CRead();	
		I2CNak();
	 	I2CStop(); /* Send stop */
	}