STM32L053C6 datasheet(34/136 Pages) STMICROELECTRONICS

34 / 136 page

Functional overview

STM32L053x6 STM32L053x8

34/136

DS10152 Rev 9

3.19.2

Universal synchronous/asynchronous receiver transmitter (USART)

The two USART interfaces (USART1, USART2) 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. They 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.

3.19.3

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

SMBus

Wakeup from STOP

1. X = supported.

2. See Table 15: STM32L053x6/8 pin definitions on page 40 for the list of I/Os that feature Fast Mode Plus

capability

Table 11. STM32L053x6/8 I2C implementation (continued)

I2C features(1)

I2C1

I2C2

Table 12. USART implementation

USART modes/features(1)

1. X = supported.

USART1 and USART2

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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