//******************************************************************************
//  MSP-FET430P120 Demo - WDT, Toggle P1.0, Interval Overflow ISR, 32kHz ACLK
//
//  Description: Toggle P1.0 using software timed by WDT ISR. Toggle rate is
//  exactly 250ms based on 32kHz ACLK WDT clock source.  In this example the
//  WDT is configured to divide 32768 watch-crystal(2^15) by 2^13 with an ISR
//  triggered @ 4Hz.
//  ACLK = LFXT1 = 32768Hz, MCLK = SMCLK = default DCO ~800kHz
//  //* External watch crystal installed on XIN XOUT is required for ACLK *//	
//
//		 MSP430F123(2)
//             -----------------
//         /|\|              XIN|-
//          | |                 | 32kHz
//          --|RST          XOUT|-
//            |                 |
//            |             P1.0|-->LED
//
//  M. Buccini
//  Texas Instruments Inc.
//  Feb 2005
//  Built with IAR Embedded Workbench Version: 3.21A
//******************************************************************************

#include  <msp430x12x2.h>

void main(void)
{
  WDTCTL = WDT_ADLY_250;                    // WDT 250ms, ACLK, interval timer
  IE1 |= WDTIE;                             // Enable WDT interrupt
  P1DIR |= 0x01;                            // Set P1.0 to output direction

  _BIS_SR(LPM3_bits + GIE);                 // Enter LPM3, enable interrupts
}

// Watchdog Timer interrupt service routine
#pragma vector=WDT_VECTOR
__interrupt void watchdog_timer(void)
{
  P1OUT ^= 0x01;                            // Toggle P1.0 using exclusive-OR
}