急！请支持：MSP430G2453的P1/ P2/ P3都能支持IO中断吗？谢谢！

只有P1、P2可以中断：

Up to three 8-bit I/O ports are implemented:
• All individual I/O bits are independently programmable.
• Any combination of input, output, and interrupt condition (port P1 and port P2 only) is possible.
• Edge-selectable interrupt input capability for all bits of port P1 and port P2 (if available).

下面是一个简单的例子：

#include <msp430.h>

int main(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop watchdog timer
P1DIR |= 0x01; // Set P1.0 to output direction
P1IE |= 0x10; // P1.4 interrupt enabled
P1IES |= 0x10; // P1.4 Hi/lo edge
P1IFG &= ~0x10; // P1.4 IFG cleared

_BIS_SR(LPM4_bits + GIE); // Enter LPM4 w/interrupt
}

// Port 1 interrupt service routine
#pragma vector=PORT1_VECTOR
__interrupt void Port_1(void)
{
P1OUT ^= 0x01; // P1.0 = toggle
P1IFG &= ~0x10; // P1.4 IFG cleared
}