How to observe transmitted data using UART Code

I am using MSP430F2132 MCU.

By loading below program I am not able to see expected waveform on P3.4 PIN.

#include <msp430.h>

 const char string1[] = { "Hello World\r\n" };

unsigned int i;

 int main(void)

{

  WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT

  P1DIR = 0xFF;                             // All P1.x outputs

  P1OUT = 0;                                // All P1.x reset

  P2DIR = 0xFF;                             // All P2.x outputs

  P2OUT = 0;                                // All P2.x reset

  P3SEL = 0x30;                             // P3.4,5 = USCI_A0 TXD/RXD

  P3DIR = 0xFF;                             // All P3.x outputs

  P3OUT = 0;                                // All P3.x reset

  UCA0CTL1 |= UCSSEL_1;                     // CLK = ACLK

  UCA0BR0 = 0x03;                           // 32kHz/9600 = 3.41

  UCA0BR1 = 0x00;                           //

  UCA0MCTL = UCBRS1 + UCBRS0 ;               // Modulation UCBRSx = 3

  UCA0CTL1 &= ~UCSWRST;                     // **Initialize USCI state machine**

  IE2 |= UCA0TXIE;                        // Enable USCI_A0 TX interrupt

  IFG2 |= 0x02;

   __bis_SR_register(LPM3_bits + GIE);       // Enter LPM3 w/ int until Byte RXed

}

 #pragma vector=USCIAB0TX_VECTOR

__interrupt void USCI0TX_ISR(void)

{

  UCA0TXBUF = string1[i++];                 // TX next character

   if (i == sizeof string1 - 1)              // TX over?

    IE2 &= ~UCA0TXIE;                       // Disable USCI_A0 TX interrupt

}

 While debugging TXBUF value loaded correctly.

But when I look for P3.OUT resistor It shows no effect.

Please help if any one have solution.

Jehan Patel