STM32L031C6 datasheet(32/126 Pages) STMICROELECTRONICS

32 / 126 page

Functional overview

STM32L031x4/6

32/126

DS10668 Rev 6

3.16.2

Universal synchronous/asynchronous receiver transmitter (USART)

The USART interface (USART2) is able to communicate at speeds of up to 4 Mbit/s.

it provides hardware management of the CTS, RTS and RS485 driver enable (DE) signals,

multiprocessor communication mode, master synchronous communication and single-wire

half-duplex communication mode. USART2 also supports Smartcard communication (ISO

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

clock domain independent from the CPU clock that allows to wake up the MCU from Stop

mode using baudrates up to 42 Kbaud.

USART2 interface can be served by the DMA controller.

Table 12 for the supported modes and features of USART interface.

3.16.3

Low-power universal asynchronous receiver transmitter (LPUART)

The devices embed one Low-power UART. The LPUART 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 from the CPU clock, and can wake up the

system from Stop mode using baudrates up to 46 Kbaud. The Wakeup events from Stop

mode are programmable and can be:

•

Start bit detection

•

Or any received data frame

•

Or 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 12. USART implementation

USART modes/features(1)

1. X = supported.

USART2

Hardware flow control for modem

Continuous communication using DMA

Multiprocessor communication

Synchronous mode(2)

2. This mode allows using the USART as an SPI master.

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 (4 modes)

Driver Enable

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