GigaDevice Semiconductor GD32VF103 - Function Overview; Table 16-1. Description of USART Important Pins

GD32VF103 User Manual
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 Multiprocessor communication
– Enter into mute mode if address match does not occur
– Wake up from mute mode by idle frame or address match detection
 Various status flags:
– Flags for transfer detection: Receive buffer not empty (RBNE), Transmit buffer
empty (TBE), transfer complete (TC).
– Flags for error detection: overrun error (ORERR), noise error (NERR), frame error
(FERR) and parity error (PERR)
– Flag for hardware flow control: CTS changes (CTSF)
– Flag for LIN mode: LIN break detected (LBDF)
– Flag for multiprocessor communication: IDLE frame detected (IDLEF)
– Interrupt occurs at these events when the corresponding interrupt enable bits are
set
While USART0/1/2 is fully implemented, UART3/4 is only partially implemented with the
following features not supported.
 Smartcard mode
 Synchronous mode
 Hardware flow control protocol (CTS/RTS)
16.3. Function overview
The interface is externally connected to another device by the main pins listed in Table 16-1.
Description of USART important pins.
Table 16-1. Description of USART important pins
Pin
Type
Description
RX
Input
Receive Data
TX
Output
I/O (single-wire/Smartcard mode)
Transmit Data. High level when enabled but nothing
to be transmitted
CK
Output
Serial clock for synchronous communication
nCTS
Input
Clear to send in hardware flow control mode
nRTS
Output
Request to send in hardware flow control mode