BCSCTL2 |=SELM1; //MCLK=LFXT2
TACTL=TASSEL_2+TACLR; //主系统时钟 清零
TACCTL0=CCIE; //CCR0 中断允许
TACCR0=40000; //初值
TACTL|=MC0; //增计数计数模式
_EINT(); //开中断
这个程序理应定时0.125us*40000=5ms?可是我测得的结果是50ms 为什么?
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