wdt.c

本代码应用于430单片机的2274系列

#include "msp430x22x4.h"
int main( void )
{
  WDTCTL=WDTPW+WDTHOLD;                   //关看门狗
  BCSCTL1 =CALBC1_1MHZ;                   //设定DCO为1MHZ
  DCOCTL =CALBC1_1MHZ;
  WDTCTL=WDTPW+WDTTMSEL+WDTSSEL+WDTCNTCL; //选择定时模式,并选时钟源为ACLK,即定时时间为ACLK/32768(WDTISx=0)
  P1OUT |=0x02;                           //LED使能
  P1DIR |=0x03;
  IE1 |=WDTIE;                            //使能WDT定时中断
  _BIS_SR(GIE+LPM3_bits);                 //进入LPM3模式,ACLK(WDT时钟源)仍工作,并使能总中断
  return 0;  
}

#pragma vector=WDT_VECTOR                 //看门狗定时中断服务
__interrupt void wdt_timer(void)  
{
  P1OUT ^=BIT0;                          //LED翻转
  P1OUT ^=BIT1;
}