STM32F411RET6 datasheet(30/149 Pages) STMICROELECTRONICS

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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 (I2S)

Five standard I2S 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 I2S 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 I2Sx can be served by the DMA controller.

3.25

Audio PLL (PLLI2S)

The devices feature an additional dedicated PLL for audio I2S application. It allows to

achieve error-free I2S sampling clock accuracy without compromising on the CPU

performance.

The PLLI2S configuration can be modified to manage an I2S 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

6.25

12.5

APB2

(max.

100 MHz)

USART2

3.12

6.25

APB1

(max.

50 MHz)

USART6

N.A

6.25

12.5

APB2

(max.

100 MHz)

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