这是由msp430f169的定时器A写的产生方波的程序，频率为1K，p1.2口的输出占空比为0.75，p1.3口的输出占空比为0.25。-This is a program written by msp430f169 Timer A square wave, the frequency of 1K, the p1.2 mouth of the output duty cycle 0.75 p1.3 output of the duty cycle of 0.25.