Datasheet

Functional overview STM32F446xC/E
34/202 DocID027107 Rev 6
3.23 Universal synchronous/asynchronous receiver transmitters
(USART)
The devices embed four universal synchronous/asynchronous receiver transmitters
(USART1, USART2, USART3 and USART6) and four universal asynchronous receiver
transmitters (UART4, and UART5).
These six interfaces provide asynchronous communication, IrDA SIR ENDEC support,
multiprocessor communication mode, single-wire half-duplex communication mode and
have LIN Master/Slave capability. The USART1 and USART6 interfaces are able to
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.
3.24 Serial peripheral interface (SPI)
The devices feature up to four SPIs in slave and master modes in full-duplex and simplex
communication modes. SPI1, and SPI4 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.
Table 8. USART feature comparison
(1)
USART
name
Standard
features
Modem
(RTS/CTS)
LIN
SPI
maste
r
irD
A
Smartcard
(ISO 7816)
Max. baud
rate in Mbit/s
(oversamplin
g by 16)
Max. baud
rate in Mbit/s
(oversamplin
g 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 - X - 2.81 5.62
APB1
(max.
45 MHz)
UART5 X 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)
1. X = feature supported.
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