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430定时器时钟源选择问题

Other Parts Discussed in Thread: MSP430G2553

我用的是msp430 launchpad  (套件里面的低频晶振没有焊上)  的部分程序是

TACCR0 = 20;
TACTL = TASSEL_1+TACLR;
TACCTL0 = CCIE;
TACTL |= MC_1;
_EINT();

我在这选的是TASSEL_1 是AC LK,  但是我的低频晶振并没有啊,,那么这样的话它是自动切换成SMCLK嘛? 还是其他什么啊,,就解答,谢谢