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一般UART都是全双工的，那这三个引脚不应该是确定的吗？为什么在硬件手册（AM4376.pdf, page97）中的描述是既是输出信号又是输入信号呢？
感谢指正，数据手册描述有误，应该rxd是I, txd是O, cts是I.
