Msp430f2618 UART Problem

Hi! All

  We are trying to write some data to serial port using the code below

   P3SEL |= 0xC0;                             // P3.6,7 = USCI_A1 TXD/RXD
  UCA1CTL1 &= 0x00;                           // Clear register
  UCA1CTL1 |= UCSSEL_1;                     // CLK = ACLK
  UCA1BR0 = 0x03;                           // 9600 (see User's Guide)
  UCA1BR1 = 0x00;                           //
  UCA1MCTL = UCBRS_6;                       // Modulation UCBRSx = 3
  UCA1CTL1 &= ~UCSWRST;
 
     while (!(UC1IFG&UCA1TXIFG));               // USCI_A1 TX buffer ready?
       UCA1TXBUF =  err_code;                    // TX -> RXed character
     while (!(UC1IFG&UCA1TXIFG));

We are getting data in UCA1TXBUF but its not pushed out to the serial port.

Please help us.

Thanks