fet110_wdt01.c

msp430系列,单片机学习程序,110

//******************************************************************************
//  MSP-FET430X110 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 ~ 800khz DCO/SMCLK clock source 
//  used in this example for the WDT.  
//  ACLK = n/a, MCLK = SMCLK = default DCO~ 800k
//
//		  MSP430F1121
//             -----------------
//         /|\|              XIN|-  
//          | |                 |
//          --|RST          XOUT|-
//            |                 |
//            |             P1.0|-->LED
//
//  M.Buccini
//  Texas Instruments, Inc
//  October 2003
//  Built with IAR Embedded Workbench Version: 1.26B
//  December 2003
//  Updated for IAR Embedded Workbench Version: 2.21B
//******************************************************************************

//******************************************************************************

#include  <msp430x11x1.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
#pragma vector=WDT_VECTOR
__interrupt void watchdog_timer(void)
{
  P1OUT ^= 0x01;                        // Toggle P1.0 using exclusive-OR
}