STM32F334 datasheet(27/115 Pages) STMICROELECTRONICS

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STM32F334x4 STM32F334x6 STM32F334x8

Functional overview

3.16.2

Universal synchronous / asynchronous

receivers / transmitters (USARTs)

The STM32F334x4/6/8 devices have three embedded universal synchronous

receivers/transmitters (USART1, USART2 and USART3).

The USART interfaces are able to communicate at speeds of up to 9 Mbits/s.

USART1 provides hardware management of the CTS and RTS signals. It supports IrDA SIR

ENDEC, the multiprocessor communication mode, the single-wire half-duplex

communication mode and has LIN Master/Slave capability.

All USART interfaces can be served by the DMA controller.

The features available in the USART interfaces are showed below inTable 8.

3.16.3

Serial peripheral interface (SPI)

A SPI interface allows to communicate up to 18 Mbits/s in slave and master modes in full-

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

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

The features available in SPI1 are showed below inTable 9.

Table 8. USART features

USART modes/features(1)

1. X = supported.

USART1

USART2

USART3

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. STM32F334x4/6/8 SPI implementation

SPI features(1)

SPI1

Hardware CRC calculation

Rx/Tx FIFO

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