[资料分享] MSP430F249外部中断P1.3口

#include "MSP430X24X.h"

void main(void)
{
        // Stop watchdog timer to prevent time out reset
        WDTCTL = WDTPW + WDTHOLD;       //关狗
  
        P4DIR = BIT0|BIT1|BIT2|BIT3;    //设置为输出
        P4SEL = 0;
        
        P1IE |= 0x08;                             // P1.3 interrupt enabled
        P1IES |= 0x08;                            // P1.3 Hi/lo edge
        P1IFG &= ~0x08;                           // P1.3 IFG cleared

        __bis_SR_register(LPM4_bits + GIE);       // Enter LPM4 w/interrupt
        
        while(1)
        {

        }
        
}
// Port 1 interrupt service routine
#pragma vector=PORT1_VECTOR
__interrupt void Port_1(void)
{
    P4OUT ^= 0x0F;              //电平翻转
    
    P1IFG &= ~0x08;             // P1.3 IFG cleared,注意清标志位，否则会一直进入中断
}