STM32F407IGH6 datasheet(34/185 Pages) STMICROELECTRONICS

34 / 185 page

Description

STM32F405xx, STM32F407xx

34/185

DocID022152 Rev 4

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.

2.2.25

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 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

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.

2.2.26

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, while using USB peripherals.

Table 5. 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)

USART3

2.62

5.25

APB1

(max.

42 MHz)

UART4

2.62

5.25

APB1

(max.

42 MHz)

UART5

2.62

5.25

APB1

(max.

42 MHz)

USART6

5.25

10.5

APB2

(max.

84 MHz)

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