Datasheet

Functional overview STM32F411xC STM32F411xE
30/149 DocID026289 Rev 6
3.23 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 interface can be configured to operate in TI mode for communications in master
mode and slave mode.
3.24 Inter-integrated sound (I
2
S)
Five standard I
2
S interfaces (multiplexed with SPI1 to SPI5) are available.They can be
operated in master or slave mode, in simplex communication modes and full duplex for I2S2
and I2S3 and can be configured to operate with a 16-/32-bit resolution as an input or output
channel. All the I2Sx audio sampling frequencies from 8 kHz up to 192 kHz are supported.
When either or both of the I
2
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.
All I
2
Sx can be served by the DMA controller.
3.25 Audio PLL (PLLI2S)
The devices feature an additional dedicated PLL for audio I
2
S application. It allows to
achieve error-free I
2
S sampling clock accuracy without compromising on the CPU
performance.
The PLLI2S configuration can be modified to manage an I
2
S sample rate change without
disabling the main PLL (PLL) used for the CPU.
The audio PLL can be programmed with very low error to obtain sampling rates ranging
from 8 kHz to 192 kHz.
Table 6. 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)
USART6 X N.A X X X X 6.25 12.5
APB2
(max.
100 MHz)
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