//******************************************************************************
//  MSP430F20xx Demo - WDT, Toggle P1.0, Interval Overflow ISR, DCO SMCLK
//
//  Description: Toggle P1.0 using software timed by the WDT ISR. Toggle rate
//  is approximately 30ms based on default DCO/SMCLK clock source
//  used in this example for the WDT.
//  ACLK = n/a, MCLK = SMCLK = default
//
//		  MSP430F20xx
//             -----------------
//         /|\|              XIN|-
//          | |                 |
//          --|RST          XOUT|-
//            |                 |
//            |             P1.0|-->LED
//
//   P.Thanigai
//  Texas Instruments Inc.
//  May 2007
//  Built with Code Composer Essentials Version: 2.0
//******************************************************************************

#include <msp430x20x3.h>

void main(void)
{
  WDTCTL = WDT_MDLY_32;                     // Set Watchdog Timer interval to ~30ms
  IE1 |= WDTIE;                             // Enable WDT interrupt
  P1DIR |= 0x01;                            // Set P1.0 to output direction

  _BIS_SR(LPM0_bits + GIE);                 // Enter LPM0 w/ interrupt
}

// Watchdog Timer interrupt service routine

__interrupt void watchdog_timer (void);
WDT_ISR(watchdog_timer)
__interrupt void watchdog_timer (void)
{
  P1OUT ^= 0x01;                            // Toggle P1.0 using exclusive-OR
}