STM32L443CC datasheet(44/207 Pages) STMICROELECTRONICS

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Functional overview

STM32L443CC STM32L443RC STM32L443VC

44/207

DocID028739 Rev 2

3.27

Universal synchronous/asynchronous receiver transmitter

(USART)

The STM32L443xx 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 10. STM32L443xx 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

STM32L443CC Datasheet(PDF) 44 Page - STMicroelectronics

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