Description
STM32F405xx, STM32F407xx
Table 5. USART feature comparison
Max. baud rate Max. baud rate
Modem
(RTS/ LIN
CTS)
USART Standard
SPI
master
Smartcard
in Mbit/s in Mbit/s
APB
irDA
name
features
(ISO 7816) (oversampling (oversampling mapping
by 16)
by 8)
APB2
(max.
84 MHz)
USART1
USART2
USART3
UART4
X
X
X
X
X
X
X
X
X
-
X
X
X
X
X
X
X
X
X
-
X
X
X
X
X
X
X
X
X
-
5.25
10.5
APB1
(max.
42 MHz)
2.62
2.62
2.62
2.62
5.25
5.25
5.25
5.25
5.25
10.5
APB1
(max.
42 MHz)
APB1
(max.
42 MHz)
APB1
(max.
42 MHz)
UART5
-
-
-
APB2
(max.
USART6
X
X
X
84 MHz)
2.2.24
Serial peripheral interface (SPI)
The STM32F40x feature up to three SPIs in slave and master modes in full-duplex and
simplex communication modes. SPI1 can communicate at up to 42 Mbits/s, SPI2 and SPI3
can communicate at up to 21 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.
2
2.2.25
Inter-integrated sound (I S)
2
Two standard I S interfaces (multiplexed with SPI2 and SPI3) are available. They can be
operated in master or slave mode, in full duplex and half-duplex communication modes, and
can be configured to operate with a 16-/32-bit resolution as an input or output channel.
Audio sampling frequencies from 8 kHz up to 192 kHz are supported. When either or both of
2
the I S interfaces is/are configured in master mode, the master clock can be output to the
external DAC/CODEC at 256 times the sampling frequency.
2
All I Sx can be served by the DMA controller.
2.2.26
Audio PLL (PLLI2S)
2
The devices feature an additional dedicated PLL for audio I S application. It allows to
2
achieve error-free I S sampling clock accuracy without compromising on the CPU
performance, while using USB peripherals.
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DocID022152 Rev 4
STMICROELECTRONICS [ ST ]
