STM32L011X3 datasheet(30/115 Pages) STMICROELECTRONICS

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STM32L011x3/4

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 and single-wire half-duplex communication mode.

USART2 also supports Smartcard communication (ISO 7816, T=0 protocol) and IrDA SIR

ENDEC.

USART2 interface can be served by the DMA controller.

Table 10 for the supported modes and features of USART interface.

Table 9. STM32L011x3/4 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 13: Pin definitions on page 37 for the list of I/Os that feature Fast Mode Plus capability

Independent clock

SMBus

Wakeup from STOP

Table 10. USART implementation

USART modes/features(1)

1. X = supported.

USART2

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 (4 modes)

Driver Enable

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