STM32L431 datasheet(42/200 Pages) STMICROELECTRONICS

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Functional overview

STM32L431xx

42/200

DocID028800 Rev 1

3.25

Universal synchronous/asynchronous receiver transmitter

(USART)

The STM32L431xx devices have three embedded universal synchronous receiver

transmitters (USART1, USART2 and USART3).

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. They are able to communicate at speeds of up to

10Mbit/s.

USART1, USART2 and USART3 also provide Smart Card mode (ISO 7816 compliant) and

SPI-like communication capability.

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

(x=1,2,3) to wake up the MCU from Stop mode using baudrates up to 200 Kbaud. The wake

up events from Stop mode are programmable and can be:

•

Start bit detection

•

Any received data frame

•

A specific programmed data frame

All USART interfaces can be served by the DMA controller.

Table 11. STM32L431xx USART/LPUART features

USART modes/features(1)

1. X = supported.

USART1

USART2

USART3

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 0 / Stop 1 modes

Wakeup from Stop 2 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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