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MSP430F5438A串口初始化的问题

Other Parts Discussed in Thread: MSP430F5438A

MSP430F5438A的串口与ARM的串口相连,arm的串口程序已近做好,在CCS编译平台上运行串口初始化程序,执行完P3|=BIT4+BIT5(选择管脚外部串口功能)后,arm的串口就收到了一个字节("0")的信息包,请问这是为什么?