#include<msp430x16x.h>
int main(void)
{
  WDTCTL=WDTPW+WDTHOLD;//CLOSE WATCHDOG
  
  P2DIR|=0XFF;P2OUT=0XFF;
  
  P1OUT=0X00;
  P1IES|=0X00;  //rising edge strike
  P1IFG=0X00;// because set up P1IES would make p1ifg change also
  P1IE|=0XFF;//p1 module interrupt allow
  _EINT();//  system interrupt allow
  
  int i;
  while(1)
  {
    for(i=1;i<3200;i++)
   
      P2OUT^=0X02;
    }
  }
#pragma vector=PORT1_VECTOR//p1 interrupt serve pragram
__interrupt void  P1_INTERRUPT(void)
{
  if(P1IFG==0X80)
  {
   P1IFG=0X00;//CLEAR INTERRUPT FLAG
   P2OUT^=0X08;
  }
  else P1IFG=0X00;
}
   此帖出自小平头技术问答