Datasheet
DocID025409 Rev 8 27/121
STM32F334x4 STM32F334x6 STM32F334x8 Functional overview
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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 in Table 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 in Table 9.
Table 8. USART features
USART modes/features
(1)
1. X = supported.
USART1
USART2
USART3
Hardware flow control for modem X X
Continuous communication using DMA X X
Multiprocessor communication X X
Synchronous mode X X
Smartcard mode X -
Single-wire half-duplex communication X X
IrDA SIR ENDEC block X -
LIN mode X -
Dual clock domain and wake up from Stop mode X -
Receiver timeout interrupt X -
Modbus communication X -
Auto baud rate detection X -
Driver Enable X X
Table 9. STM32F334x4/6/8 SPI implementation
SPI features
(1)
SPI1
Hardware CRC calculation X
Rx/Tx FIFO X
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