STM32L031C6 datasheet(31/118 Pages) STMICROELECTRONICS

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STM32L031x4/6

Functional overview

3.15.2

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.

Table 11. STM32L031x4/6 I2C implementation

I2C features(1)

1. X = supported.

I2C1

7-bit addressing mode

10-bit addressing mode

Standard mode (up to 100 kbit/s)

Fast mode (up to 400 kbit/s)

Fast Mode Plus with 20 mA output drive I/Os (up to 1 Mbit/s)

X(2)

2. See Table 15: Pin definitions on page 38 for the list of I/Os that feature Fast Mode Plus capability

Independent clock

SMBus

Wakeup from STOP

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)

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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