STM32G431C6 datasheet(40/198 Pages) STMICROELECTRONICS

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Functional overview

STM32G431x6 STM32G431x8 STM32G431xB

40/198

DS12589 Rev 6

3.30

Low-power universal asynchronous receiver transmitter

(LPUART)

The STM32G431x6/x8/xB 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 comes with a Transmit FIFO (TXFIFO) and a Receive FIFO (RXFIFO). FIFO

mode is enabled by software and is disabled by default. It has a clock domain independent

from the CPU clock, and can wakeup the system from Stop mode. The wake up from Stop

mode can be done on:

•

Start bit detection

•

Any received data frame

•

A specific programmed data frame

•

Some specific TXFIFO/RXFIFO status interrupts when FIFO mode is enabled

Only a 32.768 kHz clock (LSE) is needed to allow LPUART communication up to 9600

baud. Therefore, even in Stop 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 baudrates.

The LPUART interface can be served by the DMA controller.

3.31

Serial peripheral interface (SPI)

Three SPI interfaces allow communication up to 75 Mbits/s in master and up to 41 Mbits/s in

slave, half-duplex, full-duplex and simplex modes. The 3-bit prescaler gives 8 master mode

frequencies and the frame size is configurable from 4 bits to 16 bits. The SPI interfaces

support NSS pulse mode, TI mode and hardware CRC calculation.

Two standard I2S interfaces (multiplexed with SPI2 and SPI3) supporting four different audio

standards can operate as master or slave at half-duplex communication modes. They can

be configured to transfer 16 and 24 or 32 bits with 16-bit or 32-bit data resolution and

synchronized by a specific signal. Audio sampling frequency from 8 kHz up to 192 kHz can

be set by 8-bit programmable linear prescaler. When operating in master mode it can output

a clock for an external audio component at 256 times the sampling frequency.

All SPI interfaces can be served by the DMA controller.

Tx/Rx FIFO

Tx/Rx FIFO size

1. X = supported.

Table 9. USART/UART/LPUART features (continued)

USART modes/features(1)

USART1 USART2 USART3

UART4 LPUART1

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