STM32F217ZG datasheet(31/175 Pages) STMICROELECTRONICS

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STM32F21xxx

Functional overview

174

3.23

Serial peripheral interface (SPI)

The STM32F21x devices feature up to three SPIs in slave and master modes in full-duplex

and simplex communication modes. SPI1 can communicate at up to 30 Mbits/s, while SPI2

and SPI3 can communicate at up to 15 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)

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

operate in master or slave mode, in half-duplex communication modes, and can be

configured to operate with a 16-/32-bit resolution as input or output channels. 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 interfaces can be served by the DMA controller.

3.25

SDIO

An SD/SDIO/MMC host interface is available, that supports MultiMediaCard System

Specification Version 4.2 in three different databus modes: 1-bit (default), 4-bit and 8-bit.

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

1.87

7.5

APB2 (max.

60 MHz)

USART2

1.87

3.75

APB1 (max.

30 MHz)

USART3

1.87

3.75

APB1 (max.

30 MHz)

UART4

1.87

3.75

APB1 (max.

30 MHz)

UART5

3.75

APB1 (max.

30 MHz)

USART6

3.75

7.5

APB2 (max.

60 MHz)

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