STM32H523VCU6 datasheet(50/228 Pages) STMICROELECTRONICS

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Functional overview

STM32H523xx

50/228

DS14540 Rev 1

3.35

Universal synchronous/asynchronous receiver transmitter

(USART/UART) and low-power universal asynchronous

receiver transmitter (LPUART)

The devices have four embedded universal synchronous receiver transmitters

(USART1/USART2/USART3/USART6), two universal asynchronous receiver transmitters

(UART4/UART5), and one low-power universal asynchronous receiver transmitter

(LPUART1).

3.35.1

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.

High-speed data communications up to 20 Mbauds are possible by using the DMA (direct

memory access) for multibuffer configuration.

Table 9. USART, UART and LPUART features

Mode/feature(1)

1. X = supported.

USART

1/2/3/6

UART

4/5

LPUART

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)

2. Wake-up supported from Stop mode.

X(2)

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

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