Set MSP430 for low power mode

gistfile1.txt

// set XTAL 32768 Hz on the board

void main(void) {
  // Stop Watchdog
  WDTCTL = WDTPW + WDTHOLD;	
  //  MCLK:LFXT1CLK/8 
  // SMCLK:LFXT1CLK
	BCSCTL2 = 0xF8; 
  // IO setup	
	P1DIR = 0xFF;
	P1OUT = 0x00;
	// Timer A0 setup
	CCTL0 = CCIE;
	CCR0 = 0;
	TACCR0 = 0x3FF; // Period of 1023 + 1 cnts, which is 32Hz
	TACTL = 0x0211; // Timer_A: SMCLK, UP MODE, TAIE
	
	// Sleep
	_BIS_SR(LPM1_bits + GIE);
}

#pragma vector=TIMERA0_VECTOR
__interrupt void Timer_A (void) {
// code for flash the LED
}