msp430外部中断程序

其驱动程序如下：

int main( void )
{
WDTCTL = WDTPW + WDTHOLD;

P2IE |=0x01; //下降沿触发
P2IES |=0x01;
P2IE |=0x02;
P2IES |=0x02;
P2IFG &=~0x03;
_BIS_SR(GIE);

}

#pragma vector =PORT2_VECTOR
__interrupt void Port_1(void)
{

if((P2IFG | 0xfe)==0xff)
{

P2IFG &=~0x03;
}
if((P2IFG | 0xfd)==0xff)
{

P2IFG &=~0x03;
}
}