STM32U545NET3QTR datasheet(80/283 Pages) STMICROELECTRONICS

80 / 283 page

Functional overview

STM32U545xx

80/283

DS14216 Rev 1

3.42

Universal synchronous/asynchronous receiver transmitter

(USART/UART)

and low-power universal asynchronous receiver transmitter

(LPUART)

The devices embed two universal synchronous receiver transmitters (USART1, USART3),

two universal asynchronous receiver transmitters (UART4, UART5) and one low-power

universal asynchronous receiver transmitter (LPUART1).

3.42.1

Universal synchronous/asynchronous receiver transmitter

(USART/UART)

The USART offers a flexible means to perform full-duplex data exchange with external

equipments requiring an industry standard NRZ asynchronous serial data format. A very

wide range of baud rates can be achieved through a fractional baud rate generator.

The USART supports both synchronous one-way and half-duplex single-wire

communications, as well as LIN (local interconnection network), Smartcard protocol, IrDA

(infrared data association) SIR ENDEC specifications, and modem operations (CTS/RTS).

Multiprocessor communications are also supported.

Table 22. USART, UART and LPUART features

USART modes/features(1)

1. X = supported.

USART1/3

UART4/5

LPUART1

Hardware flow control for modem

Continuous communication using DMA

Multiprocessor communication

Synchronous mode (master/slave)

Smartcard mode

Single-wire half-duplex communication

IrDA SIR ENDEC block

LIN mode

Dual-clock domain and wake-up from Stop mode

X(2)

Wake-up supported from Stop 0 and Stop 1 modes.

X(2)

X(3)

Wake-up supported from Stop 0, Stop 1 and Stop 2 modes.

Receiver timeout interrupt

Modbus communication

Auto-baud rate detection

Driver enable

USART data length

7, 8 and 9 bits

Tx/Rx FIFO

Tx/Rx FIFO size

8 bytes

Autonomous mode

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