STM32L151RDT6 datasheet(30/140 Pages) STMICROELECTRONICS

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Functional overview

STM32L151xD STM32L152xD

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Doc ID 022027 Rev 6

3.18.2

Universal synchronous/asynchronous receiver transmitter (USART)

The three USART and two UART interfaces are able to communicate at speeds of up to 4

Mbit/s. They support IrDA SIR ENDEC, are ISO 7816 compliant and have LIN Master/Slave

capability. The three USARTs provide hardware management of the CTS and RTS signals.

All USART/UART interfaces can be served by the DMA controller.

3.18.3

Serial peripheral interface (SPI)

Up to three SPIs are able to communicate at up to 16 Mbits/s in slave and master modes in

full-duplex and half-duplex communication modes. 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.

The SPIs can be served by the DMA controller.

3.18.4

Inter-integrated sound (I2S)

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

operate in master or slave mode, 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.

The I2Ss can be served by the DMA controller.

3.18.5

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.

The interface allows data transfer at up to 24 MHz in 8-bit mode, 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, this interface is fully compliant with the CE-ATA digital protocol

Rev1.1.

3.18.6

Universal serial bus (USB)

The STM32L15xxD embeds a USB device peripheral compatible with the USB full-speed

12 Mbit/s. The USB interface implements a full-speed (12 Mbit/s) function interface. It has

software-configurable endpoint setting and supports suspend/resume. The dedicated

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