Specifications

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3.3 The UART interface
The module supports UART (universal asynchronous transceiver), full duplex transmission
and reception via TX and RX interfaces. Support hardware flow control RTS and CTS.
Figure 3-2 UART communication
 As shown in figure 3-2, the sent data is written to the TX buffer, and the UART module
transfers the data from the TX buffer through the TX foot
When transferred to other devices, the data received by the RX foot is first sent to the
RX buffer and then read through the MCU or DMA.
 If the UART's RX buffer is full, the UART module will send a signal (configurable high or
low) through the RTS foot, informing other devices that it should stop sendin
g
dat
a.Similarly, UART receives CTS foot signal. Indicates that the RX buffer of other
devices is close to full, and UART should stop sending data.
2019.09
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