STM32L452VCT3 datasheet(49/210 Pages) STMICROELECTRONICS

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STM32L452xx

Functional overview

3.26

Universal synchronous/asynchronous receiver transmitter

(USART)

The STM32L452xx devices have three embedded universal synchronous receiver

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

transmitters (UART4).

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=1,2,3,4) to wake up the MCU from Stop mode using baudrates up to 204 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 13. STM32L452xx USART/UART/LPUART features

USART modes/features(1)

USART1 USART2 USART3

UART4

LPUART1

Hardware flow control for modem

XXXX

Continuous communication using DMA

XXXX

Multiprocessor communication

XXXX

Synchronous mode

Smartcard mode

Single-wire half-duplex communication

XXXX

IrDA SIR ENDEC block

XXXX

LIN mode

XXXX

Dual clock domain

XXXX

Wakeup from Stop 0 / Stop 1 modes

XXXX

Wakeup from Stop 2 mode

----

Receiver timeout interrupt

XXXX

Modbus communication

XXXX

Auto baud rate detection

X (4 modes)

Driver Enable

XXXX

LPUART/USART data length

7, 8 and 9 bits

1. X = supported.

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