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我在进行串口通讯时，8M的一上电不能正常使用，只有用32768晶振先进行一次串口通讯，然后再用8M的就能正常通信，好像32768的晶振是一个刺激一样，这是为什么呢？
pls check the user guide http://www.ti.com/lit/ug/slau049f/slau049f.pdf
