STM32G081CB datasheet(34/136 Pages) STMICROELECTRONICS

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Functional overview

STM32G081xB

34/136

DS12231 Rev 4

half-duplex communication mode. Some can also support SmartCard communication (ISO

7816), IrDA SIR ENDEC, LIN Master/Slave capability and auto baud rate feature, and have

a clock domain independent of the CPU clock, which allows them to wake up the MCU from

Stop mode. The wakeup 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.

3.24

Low-power universal asynchronous receiver transmitter

(LPUART)

The device embeds one LPUART. The peripheral supports asynchronous serial

communication with minimum power consumption. It supports half duplex single wire

communication and modem operations (CTS/RTS). It allows multiprocessor

communication.

The LPUART has a clock domain independent of the CPU clock, and can wakeup the

system from Stop mode. The Stop mode wakeup events are programmable and can be:

•

start bit detection

•

any received data frame

•

a specific programmed data frame

Only a 32.768 kHz clock (LSE) is needed to allow LPUART communication up to 9600

baud. Therefore, even in Stop mode, the LPUART can wait for an incoming frame while

Table 9. USART implementation

USART modes/features(1)

1. X: supported

USART1

USART2

USART3

USART4

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 and wakeup from Stop mode

Receiver timeout interrupt

Modbus communication

Auto baud rate detection

Driver Enable

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