STM32L081CB datasheet(30/110 Pages) STMICROELECTRONICS

30 / 110 page

Functional overview

STM32L081xx

30/110

DocID027513 Rev 4

3.16.2

Universal synchronous/asynchronous receiver transmitter (USART)

The four USART interfaces (USART1, USART2, USART4 and USART5) are able to

communicate at speeds of up to 4 Mbit/s.

They provide 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. USART1 and USART2 also support

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, allowing to

wake up the MCU from Stop mode using baudrates up to 42 Kbaud.

All USART interfaces can be served by the DMA controller.

Table 11 for the supported modes and features of USART interfaces.

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

Mbit/s)

XX(2)

Independent clock

SMBus

Wakeup from STOP

1. X = supported.

2. See Table 14: STM32L081xxx pin definition on page 35 for the list of I/Os that feature Fast Mode Plus

capability

Table 10. STM32L081xx I2C implementation (continued)

I2C features(1)

I2C1

I2C2

I2C3

Table 11. USART implementation

USART modes/features(1)

1. X = supported.

USART1 and USART2 USART4 and USART5

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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