UART 接收引脚 （ RX 引脚）上的信号能在内部传送至一个输入捕捉模块以获得输入信号边沿的时序。根据该时序，应用程序能正确设置UART 的波特率。-The signal on the UART receive pin (RX pin) can be internally routed to an Input Capture module to time the edges of the incoming signal. From that timing the software can se