MCBSTM32EXL【PDF 624/995 页】BOARD EVALUATION FOR STM32F103ZE

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Inter-integrated circuit (I 2 C) interface

RM0008

24

24.1

24.2

Inter-integrated circuit (I 2 C) interface

Low-density devices are STM32F101xx, STM32F102xx and STM32F103xx

microcontrollers where the Flash memory density ranges between 16 and 32 Kbytes.

Medium-density devices are STM32F101xx, STM32F102xx and STM32F103xx

microcontrollers where the Flash memory density ranges between 64 and 128 Kbytes.

High-density devices are STM32F101xx and STM32F103xx microcontrollers where the

Flash memory density ranges between 256 and 512 Kbytes.

Connectivity line devices are STM32F105xx and STM32F107xx microcontrollers.

This section applies to the whole STM32F10xxx family, unless otherwise specified.

I 2 C introduction

I 2 C (inter-integrated circuit) bus Interface serves as an interface between the microcontroller

and the serial I 2 C bus. It provides multimaster capability, and controls all I 2 C bus-specific

sequencing, protocol, arbitration and timing. It supports standard and fast speed modes. It is

also SMBus 2.0 compatible.

It may be used for a variety of purposes, including CRC generation and verification, SMBus

(system management bus) and PMBus (power management bus).

Depending on specific device implementation DMA capability can be available for reduced

CPU overload.

I 2 C main features

●

●

●

Parallel-bus/I 2 C protocol converter

Multimaster capability: the same interface can act as Master or Slave

I 2 C Master features:

–

–

Clock generation

Start and Stop generation

●

I 2 C

–

–

–

Slave features:

Programmable I 2 C Address detection

Dual Addressing Capability to acknowledge 2 slave addresses

Stop bit detection

●

●

Generation and detection of 7-bit/10-bit addressing and General Call

Supports different communication speeds:

–

–

Standard Speed (up to 100 kHz),

Fast Speed (up to 400 kHz)

●

Status flags:

624/995

–

–

–

Transmitter/Receiver mode flag

End-of-Byte transmission flag

I 2 C busy flag

Doc ID 13902 Rev 9

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