STM32WB09KE datasheet(21/73 Pages) STMICROELECTRONICS

21 / 73 page

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Independent clock: a choice of independent clock sources allowing the I2C communication speed to be

independent from the PCLK reprogramming

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Programmable analog and digital noise filters

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1-byte buffer with DMA capability

3.20

Universal synchronous/asynchronous receiver transmitter (USART)

USART offers flexible full-duplex data exchange with external equipment requiring an industry standard NRZ

asynchronous serial data format. USART can communicate with a speed up to 2 Mbit/s. Furthermore, USART can

detect and automatically set its own baud rate, based on the reception of a single character.

USART peripheral supports:

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Synchronous one-way communication

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Half-duplex single wire communication

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Local interconnection network (LIN) master/slave capability

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Smart card mode, ISO 7816 compliant protocol

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IrDA (infrared data association) SIR ENDEC specifications

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Modem operations (CTS/RTS)

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RS485 driver enable

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Multiprocessor communications

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SPI-like communication capability

High speed data communication is possible by using DMA (direct memory access) for multibuffer configuration.

3.21

Low-power universal asynchronous receiver transmitter (LPUART)

The device embeds one low-power UART, enabling asynchronous serial communication with minimum power

consumption. The LPUART supports half duplex single wire communication and modem operations (CTS/RTS),

allowing multiprocessor communication.

The LPUART has a clock domain independent from the CPU clock, and can wakeup the system from Deepstop

mode using baud rates up to 9600 baud. The wakeup events from Stop mode are programmable and can be:

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Start bit detection

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Any received data frame

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A specific programmed data frame

Only a 32.768 kHz clock (LSE) is needed to allow LPUART communication up to 9600 baud. Therefore, even in

Deepstop mode, the LPUART can wait for an incoming frame while having an extremely low energy consumption.

Higher speed clock can be used to reach higher baud rates in Run mode.

The LPUART interfaces can be served by the DMA controller.

STM32WB09xE

Functional overview

DS14210 - Rev 6

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