32G431 datasheet(39/198 Pages) STMICROELECTRONICS

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DS12589 Rev 6

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STM32G431x6 STM32G431x8 STM32G431xB

Functional overview

3.29

Universal synchronous/asynchronous receiver transmitter

(USART)

The STM32G431x6/x8/xB devices have three embedded universal synchronous receiver

transmitters (USART1, USART2 and USART3) and one universal asynchronous receiver

transmitters (UART4).

These interfaces provide asynchronous communication, IrDA SIR ENDEC support,

multiprocessor communication mode, single-wire half-duplex communication mode and

have LIN master/slave capability. They provide hardware management of the CTS and RTS

signals, and RS485 driver enable.

The USART1, USART2 and USART3 also provide a Smartcard mode (ISO 7816 compliant)

and an SPI-like communication capability.

The USART comes with a Transmit FIFO (TXFIFO) and a Receive FIFO (RXFIFO). FIFO

mode is enabled by software and is disabled by default.

All USART have a clock domain independent from the CPU clock, allowing the USARTx

(x=1,2,3,4) to wake up the MCU from Stop mode. The wakeup from Stop mode can be done

on:

•

Start bit detection

•

Any received data frame

•

A specific programmed data frame

•

Some specific TXFIFO/RXFIFO status interrupts when FIFO mode is enabled

All USART interfaces can be served by the DMA controller.

Table 9. USART/UART/LPUART features

USART modes/features(1)

USART1 USART2 USART3

UART4 LPUART1

Hardware flow control for modem

Continuous communication using DMA

Multiprocessor communication

Synchronous mode

Smartcard mode

Single-wire half-duplex communication

IrDA SIR ENDEC block

LIN mode

Dual clock domain

Wakeup from Stop mode

Receiver timeout interrupt

Modbus communication

Auto baud rate detection

X (4 modes)

Driver Enable

LPUART/USART data length

7, 8 and 9 bits

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