STM32F031X4 datasheet(21/106 Pages) STMICROELECTRONICS

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STM32F031x4 STM32F031x6

Functional overview

3.15

Serial peripheral interface (SPI) / Inter-integrated sound

interface (I2S)

The SPI is able to communicate up to 18 Mbit/s in slave and master modes in full-duplex

and half-duplex communication modes. The 3-bit prescaler gives 8 master mode

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

One standard I2S interface (multiplexed with SPI1) supporting four different audio standards

can operate as master or slave at half-duplex communication mode. It 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 an 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.

Table 8. STM32F031x4/x6 USART implementation

USART modes/features(1)

1. X = supported.

USART1

Hardware flow control for modem

Continuous communication using DMA

Multiprocessor communication

Synchronous mode

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

Driver Enable

Table 9. STM32F031x4/x6 SPI/I2S implementation

SPI features(1)

1. X = supported.

SPI

Hardware CRC calculation

Rx/Tx FIFO

NSS pulse mode

I2S mode

TI mode

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