STM32L4R9AI datasheet(57/306 Pages) STMICROELECTRONICS

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STM32L4R5xx, STM32L4R7xx and STM32L4R9xx

Functional overview

3.33

Universal synchronous/asynchronous receiver transmitter

(USART)

The STM32L4Rxxx devices have three embedded universal synchronous receiver

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

transmitters (UART4, UART5).

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

10 Mbit/s.

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

and an SPI-like communication capability.

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

(x=1,2,3,4,5) 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 12. USART/UART/LPUART features

USART modes/features(1)

USART1 USART2 USART3 UART4

UART5

LPUART1

Hardware flow control for modem

XXXXX

Continuous communication using DMA

XXXXX

Multiprocessor communication

XXXXX

Synchronous mode

Smartcard mode

Single-wire half-duplex communication

XXXXX

IrDA SIR ENDEC block

XXXXX

LIN mode

XXXXX

Dual clock domain

XXXXX

Wakeup from Stop 0 / Stop 1 modes

XXXXX

Wakeup from Stop 2 mode

-----

Receiver timeout interrupt

XXXXX

Modbus communication

XXXXX

Auto baud rate detection

X (4 modes)

Driver enable

XXXXX

LPUART/USART data length

7, 8 and 9 bits

1. X = supported.

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