STM32F103XC datasheet(21/143 Pages) STMICROELECTRONICS

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DS5792 Rev 13

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STM32F103xC, STM32F103xD, STM32F103xE

Description

135

the main clock. It has an early warning interrupt capability and the counter can be frozen in

debug mode.

SysTick timer

This timer is dedicated to real-time operating systems, but could also be used as a standard

down counter. It features:

•

A 24-bit down counter

•

Autoreload capability

•

Maskable system interrupt generation when the counter reaches 0.

•

Programmable clock source

2.3.18

I²C bus

Up to two I²C bus interfaces can operate in multimaster and slave modes. They can support

standard and fast modes.

They support 7/10-bit addressing mode and 7-bit dual addressing mode (as slave). A

hardware CRC generation/verification is embedded.

They can be served by DMA and they support SMBus 2.0/PMBus.

2.3.19

Universal synchronous/asynchronous receiver transmitters (USARTs)

The STM32F103xC, STM32F103xD and STM32F103xE performance line embeds three

universal synchronous/asynchronous receiver transmitters (USART1, USART2 and

USART3) and two universal asynchronous receiver transmitters (UART4 and UART5).

These five interfaces provide asynchronous communication, IrDA SIR ENDEC support,

multiprocessor communication mode, single-wire half-duplex communication mode and

have LIN Master/Slave capability.

The USART1 interface is able to communicate at speeds of up to 4.5 Mbit/s. The other

available interfaces communicate at up to 2.25 Mbit/s.

USART1, USART2 and USART3 also provide hardware management of the CTS and RTS

signals, Smart Card mode (ISO 7816 compliant) and SPI-like communication capability. All

interfaces can be served by the DMA controller except for UART5.

2.3.20

Serial peripheral interface (SPI)

Up to three SPIs are able to communicate up to 18 Mbits/s in slave and master modes in

full-duplex and simplex 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.

All SPIs can be served by the DMA controller.

2.3.21

Inter-integrated sound (I2S)

Two standard I2S interfaces (multiplexed with SPI2 and SPI3) are available, that can be

operated in master or slave mode. These interfaces can be configured to operate with 16/32

bit resolution, as input or output channels. Audio sampling frequencies from 8 kHz up to

48 kHz are supported. When either or both of the I2S interfaces is/are configured in master

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