STM32L432KB datasheet(39/149 Pages) STMICROELECTRONICS

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STM32L432KB STM3L432KC

Functional overview

3.24

Universal synchronous/asynchronous receiver transmitter

(USART)

The STM32L432xx devices have two embedded universal synchronous receiver

transmitters (USART1 and USART2).

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 and USART2 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) 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. STM32L432xx USART/LPUART features

USART modes/features(1)

1. X = supported.

USART1

USART2

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

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