STM32F411RET6 datasheet(31/149 Pages) STMICROELECTRONICS

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STM32F411xC STM32F411xE

Functional overview

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).

3.26

Secure digital input/output interface (SDIO)

An SD/SDIO/MMC/eMMC 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.

The interface allows data transfer at up to 50 MHz, and is compliant with the SD Memory

Card Specification Version 2.0.

The SDIO Card Specification Version 2.0 is also supported with two different databus

modes: 1-bit (default) and 4-bit.

The current version supports only one SD/SDIO/MMC4.2 card at any one time and a stack

of MMC4.1 or previous.

In addition to SD/SDIO/MMC/eMMC, this interface is fully compliant with the CE-ATA digital

protocol Rev1.1.

3.27

Universal serial bus on-the-go full-speed (OTG_FS)

The devices embed an USB OTG full-speed device/host/OTG peripheral with integrated

transceivers. The USB OTG FS peripheral is compliant with the USB 2.0 specification and

with the OTG 1.0 specification. It has software-configurable endpoint setting and supports

suspend/resume. The USB OTG full-speed controller requires a dedicated 48 MHz clock

that is generated by a PLL connected to the HSE oscillator. The major features are:

•

Combined Rx and Tx FIFO size of 320 × 35 bits with dynamic FIFO sizing

•

Supports the session request protocol (SRP) and host negotiation protocol (HNP)

•

4 bidirectional endpoints

•

8 host channels with periodic OUT support

•

HNP/SNP/IP inside (no need for any external resistor)

•

For OTG/Host modes, a power switch is needed in case bus-powered devices are

connected

3.28

General-purpose input/outputs (GPIOs)

Each of the GPIO pins can be configured by software as output (push-pull or open-drain,

with or without pull-up or pull-down), as input (floating, with or without pull-up or pull-down)

or as peripheral alternate function. Most of the GPIO pins are shared with digital or analog

alternate functions. All GPIOs are high-current-capable and have speed selection to better

manage internal noise, power consumption and electromagnetic emission.

The I/O configuration can be locked if needed by following a specific sequence in order to

avoid spurious writing to the I/Os registers.

Fast I/O handling allowing maximum I/O toggling up to 100 MHz.

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