Datasheet

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STM32F412xE/G Functional overview
42
3.25 Universal synchronous/asynchronous receiver transmitters
(USART)
The devices embed four universal synchronous/asynchronous receiver transmitters
(USART1, USART2, USART3 and USART6).
These four interfaces provide asynchronous communication, IrDA SIR ENDEC support,
multiprocessor communication mode, single-wire half-duplex communication mode and
have LIN Master/Slave capability. USART1 and USART6 interfaces are able to
communicate at speeds of up to 12.5 Mbit/s. USART2 and USART3 interfaces
communicate at up to 6.25 bit/s.
All USART interfaces provide hardware management of the CTS and RTS signals, Smart
Card mode (ISO 7816 compliant) and SPI-like communication capability. All interfaces can
be served by the DMA controller.
3.26 Serial peripheral interface (SPI)
The devices feature five SPIs in slave and master modes in full-duplex and simplex
communication modes. SPI1, SPI4 and SPI5 can communicate at up to 50 Mbit/s, SPI2 and
SPI3 can communicate at up to 25 Mbit/s. The 3-bit prescaler gives 8 master mode
frequencies and the frame is configurable to 8 bits or 16 bits. The hardware CRC
generation/verification supports basic SD Card/MMC modes. All SPIs can be served by the
DMA controller.
The SPI interfaces can be configured to operate in TI mode for communications in master
mode and slave mode.
Table 7. USART feature comparison
USART
name
Standard
features
Modem
(RTS/CTS)
LIN
SPI
master
irDA
Smartcard
(ISO 7816)
Max. baud
rate in Mbit/s
(oversampling
by 16)
Max. baud
rate in Mbit/s
(oversampling
by 8)
APB
mapping
USART1 X X X X X X 6.25 12.5
APB2
(max.
100 MHz)
USART2 X X X X X X 3.12 6.25
APB1
(max.
50 MHz)
USART3 X X X X X X 3.12 6.25
APB1
(max.
50 MHz)
USART6 X X X X X X 6.25 12.5
APB2
(max.
100 MHz)
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