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Functional overview STM32L011x3/4

30/119 DocID027973 Rev 5

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 I

C implementation

I2C features

(1)

1. X = supported.

I2C1

7-bit addressing mode X

10-bit addressing mode X

Standard mode (up to 100 kbit/s) X

Fast mode (up to 400 kbit/s) X

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 X

SMBus X

Wakeup from STOP X

Table 10. USART implementation

USART modes/features

(1)

1. X = supported.

USART2

Hardware flow control for modem X

Continuous communication using DMA X

Multiprocessor communication X

Synchronous mode -

Smartcard mode X

Single-wire half-duplex communication X

IrDA SIR ENDEC block X

LIN mode -

Dual clock domain and wakeup from Stop mode -

Receiver timeout interrupt -

Modbus communication -

Auto baud rate detection (4 modes) -

Driver Enable X

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