MSP430G2452按鍵(P1.3)控制P1.0(LED)燈亮滅C語言程序，P1.3為帶上拉電阻的輸入狀態，P1.0為輸出狀態，當P1.3按下，P1.0口LED燈則亮，松開按鍵，LED燈則熄滅，無限循環的下去！程序如下：
#include "msp430g2452.h"
void main(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop watchdog timer
P1DIR = 0x01; // P1.0 output, else input
P1OUT = 0x08; // P1.3 set, else reset
P1REN |= 0x08; // P1.3 pullup
while (1) // Test P1.3
{
if(0x08 & P1IN)
{
P1OUT |= 0x01; // if P1.3 set, set P1.0
}
else P1OUT &= ~0x01; // else reset
}
}