ST72344K2 datasheet(150/247 Pages) STMICROELECTRONICS

150 / 247 page

On-chip peripherals

ST72344xx, ST2345xx

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Doc ID 12321 Rev 6

11.6

I2C bus interface (I2C)

11.6.1

Introduction

The I2C bus interface serves as an interface between the microcontroller and the serial I2C

bus. It provides both multimaster and slave functions, and controls all I2C bus-specific

sequencing, protocol, arbitration and timing. It supports fast I2C mode (400 kHz).

11.6.2

Main features

●

Parallel-bus/I2C protocol converter

●

Multi-master capability

●

7-bit/10-bit Addressing

●

Transmitter/Receiver flag

●

End-of-byte transmission flag

●

Transfer problem detection

I2C master features

●

Clock generation

●

I2C bus busy flag

●

Arbitration lost flag

●

End of byte transmission flag

●

Transmitter/receiver flag

●

Start bit detection flag

●

Start and Stop generation

I2C slave features

●

Stop bit detection

●

I2C bus busy flag

●

Detection of misplaced start or stop condition

●

Programmable I2C address detection

●

Transfer problem detection

●

End-of-byte transmission flag

●

Transmitter/receiver flag

11.6.3

General description

In addition to receiving and transmitting data, this interface converts it from serial to parallel

format and vice versa, using either an interrupt or polled handshake. The interrupts are

enabled or disabled by software. The interface is connected to the I2C bus by a data pin

(SDAI) and by a clock pin (SCLI). It can be connected both with a standard I2C bus and a

Fast I2C bus. This selection is made by software.

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