Datasheet

Functional overview STM32F427xx STM32F429xx
38/239 DocID024030 Rev 10
communicate at speeds of up to 11.25 Mbit/s. The other available interfaces communicate
at up to 5.62 bit/s.
USART1, USART2, USART3 and USART6 also 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.
3.25 Serial peripheral interface (SPI)
The devices feature up to six SPIs in slave and master modes in full-duplex and simplex
communication modes. SPI1, SPI4, SPI5, and SPI6 can communicate at up to 45 Mbits/s,
SPI2 and SPI3 can communicate at up to 22.5 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 interface can be configured to operate in TI mode for communications in master
mode and slave mode.
Table 8. USART feature comparison
(1)
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 5.62 11.25
APB2
(max.
90 MHz)
USART2 X X X X X X 2.81 5.62
APB1
(max.
45 MHz)
USART3 X X X X X X 2.81 5.62
APB1
(max.
45 MHz)
UART4 X - X - X - 2.81 5.62
APB1
(max.
45 MHz)
UART5 X - X - X - 2.81 5.62
APB1
(max.
45 MHz)
USART6 X X X X X X 5.62 11.25
APB2
(max.
90 MHz)
UART7 X - X - X - 2.81 5.62
APB1
(max.
45 MHz)
UART8 X - X - X - 2.81 5.62
APB1
(max.
45 MHz)
1. X = feature supported.
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