//******************************************************************************
//  MSP430FG54x 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 = {(default DCO 1.045MHz) / 32768} based on default
//  DCO/SMCLK clock source used in this example for the WDT.
//  ACLK = n/a, MCLK = SMCLK = default DCO ~1.045MHz
//
//                MSP430F5438
//             -----------------
//         /|\|                 |
//          | |                 |
//          --|RST              |
//            |                 |
//            |             P1.0|-->LED
//
//   M Smertneck / W. Goh
//   Texas Instruments Inc.
//   September 2008
//   Built with CCE Version: 3.2.2 and IAR Embedded Workbench Version: 4.11B
//******************************************************************************

#include "msp430x54x.h"

void main(void)
{
  WDTCTL = WDT_MDLY_32;                     // WDT 32ms, SMCLK, interval timer 
  SFRIE1 |= WDTIE;                          // Enable WDT interrupt
  P1DIR |= 0x01;                            // Set P1.0 to output direction

  __bis_SR_register(LPM0_bits + GIE);       // Enter LPM0, enable interrupts
  __no_operation();                         // For debugger
}

// Watchdog Timer interrupt service routine
#pragma vector=WDT_VECTOR
__interrupt void WDT_ISR(void)
{
  P1OUT ^= 0x01;                            // Toggle P1.0 (LED)
}