MSP430G2553: msp430g2553 with DS1307 RTC

I got this code from TI Forum. I tried to interface it with DS1307 RTC module from Maxim Electronics. I am able to send the slave address, but the code gets stuck when I am trying to send the register address. 

Can somebody help me with this? I'm guessing that UCB0TXIFG is not getting set.

unsigned char read(unsigned char registerAddr)
{
unsigned char receivedByte = 0;
UCB0I2CSA = 0xD0; // Slave Address is 069h
while (UCB0CTL1 & UCTXSTP); // Ensure stop condition got sent

UCB0CTL1 |= UCTR + UCTXSTT; // I2C start condition with UCTR flag for transmit

while((IFG2 & UCB0TXIFG) == 0); //UCB0TXIFG is set immidiately

UCB0TXBUF = registerAddr; //write registerAddr in TX buffer


while((IFG2 & UCB0TXIFG) == 0);        //Code Gets stuck here. It does not proceed further


UCB0CTL1 &= ~UCTR ; // Clear I2C TX flag for receive
UCB0I2CSA = 0xD1; // Slave Address is 069h
UCB0CTL1 |= UCTXSTT; // Repeated start
while (UCB0CTL1 & UCTXSTT); // Start condition sent? RXBuffer full?


UCB0CTL1 |= UCTXSTP;
while((IFG2 & UCB0RXIFG) == 0); // wait until TX buffer is empty and transmitted
//print("hello\r\n");
receivedByte = UCB0RXBUF; // I2C stop condition
return receivedByte;

}