Routing SMCLK, MCLK to port pin issue

Hi i am using msp430f2410 MCU with CCS 6.0 compiler.

32KHZ external clock is connected to Xin/Xout (Pin8&9)

Below is my code.

#include "msp430f2410.h"

void main(void)
{
  WDTCTL = WDTPW + WDTHOLD;                 // Stop Watchdog Timer
  if (CALBC1_8MHZ ==0xFF || CALDCO_8MHZ == 0xFF)
  {
    while(1);                               // If calibration constants erased
                                            // do not load, trap CPU!!
  }
  BCSCTL1 = CALBC1_8MHZ;                    // Set DCO to 8MHz
  DCOCTL = CALDCO_8MHZ;

  P5DIR |= 0x70;                            // P5.6,5,4 outputs
  P5SEL |= 0x70;                            // P5.6,5,4 options

  while(1)
  {
  }
}

When i run this program the program execution stops inside the for loop.

I want to know why it is stopping there and how to resolve this issue?

Thanks in Advance,

Vinoth