main.c

MSP430F22X单片机开发套件源代码

#include "msp430x22x4.h"
//WDT定时器模式下1秒钟定时
//1秒钟触发看门狗定时中断
//来翻转P1.0
//                 MSP430F2274
//             -----------------
//         /|\|              XIN|-  
//          | |                 |
//          --|RST          XOUT|-
//            |                 |
//            |             P1.0|-->LED

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 |=BIT0;                           //LED使能
  P1DIR |=BIT0;
  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
}