STM32L082KB datasheet(34/132 Pages) STMICROELECTRONICS

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Functional overview

STM32L082xx

34/132

DS10688 Rev 7

3.18.2

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 12 for the supported modes and features of USART interfaces.

3.18.3

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. It 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

Table 12. 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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