STM32F401CCU6 datasheet(29/135 Pages) STMICROELECTRONICS

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Functional overview

STM32F401xB STM32F401xC

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DocID024738 Rev 6

3.22

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 42 Mbit/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.

3.23

Inter-integrated sound (I2S)

Two standard I2S interfaces (multiplexed with SPI2 and SPI3) are available. They can be

operated in master or slave mode, in full duplex and simplex 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

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.

3.24

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.

In addition to the audio PLL, a master clock input pin can be used to synchronize the I2S

flow with an external PLL (or Codec output).

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

5.25

10.5

APB2

(max.

84 MHz)

USART2

2.62

5.25

APB1

(max.

42 MHz)

USART6

N.A

5.25

10.5

APB2

(max.

84 MHz)

STM32F401CCU6 Datasheet(PDF) 29 Page - STMicroelectronics

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