AT32F421 Series Reference Manual
2022.11.11 Page 143 Rev 2.02
Figure 12-13 USART interrupt map diagram
12.11 I/O pin control
The following five interfaces are used for USART communication.
RX: Serial data input.
TX: Serial data output. In single-wire half-duplex and Smartcard mode, the TX pin is used as an I/O for
data transmission and reception.
CK: Transmitter clock output. The output CLK phase, polarity and frequency are programmable.
CTS: Transmitter input. Send enable signal in hardware flow control mode.
RTS: Receiver output. Send request signal in hardware flow control mode.
12.12 USART registers
These peripheral registers must be accessed by words (32 bits).
Table 12-5 USART register map and reset value
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