Datasheet

DocID025147 Rev 7 27/138
STM32F302x6 STM32F302x8 Functional overview
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3.18 Universal synchronous/asynchronous receiver transmitter
(USART)
The STM32F302x6/8 devices have three embedded universal synchronous receiver
transmitters (USART1, USART2 and USART3).
The USART interfaces are able to communicate at speeds of up to 9 Mbit/s.
All USARTs support hardware management of the CTS and RTS signals, multiprocessor
communication mode, single-wire half-duplex communication mode and synchronous
mode.
USART1 supports SmartCard mode, IrDA SIR ENDEC, LIN Master capability and
autobaudrate detection.
All USART interfaces can be served by the DMA controller.
Refer to Table 8 for the features available in all USARTs interfaces.
3.19 Serial peripheral interfaces (SPI)/Inter-integrated sound
interfaces (I2S)
Two SPI interfaces (SPI2 and SPI3) allow communication up to 18 Mbit/s in slave and
master modes in 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.
Two standard I2S interfaces (multiplexed with SPI2 and SPI3) are available, that can be
operated in master or slave mode. These interfaces can be configured to operate with 16/32
bit resolution, as input or output channels. Audio sampling frequencies from 8 kHz up to
192
kHz are supported. When either or both of the I2S interfaces is/are configured in master
Table 8. USART features
USART modes/features
(1)
1. X = supported.
USART1 USART2 USART3
Hardware flow control for modem X X X
Continuous communication using DMA X X X
Multiprocessor communication X X X
Synchronous mode X X X
SmartCard mode X - -
Single-wire half-duplex communication X X X
IrDA SIR ENDEC block X - -
LIN mode X - -
Dual clock domain and wakeup from Stop mode X - -
Receiver timeout interrupt X - -
Modbus communication X - -
Auto baud rate detection X - -
Driver Enable X X X
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