ST92F120JR9T datasheet(221/320 Pages) STMICROELECTRONICS

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I2C BUS INTERFACE

10.7 I2C BUS INTERFACE

10.7.1 Introduction

The I2C bus Interface serves as an interface be-

tween the microcontroller and the serial I2C bus. It

provides both multimaster and slave functions with

both 7-bit and 10-bit address modes; it controls all

I2C bus-specific sequencing, protocol, arbitration,

timing and supports both standard (100KHz) and

fast I

2C modes (400KHz).

Using DMA, data can be transferred with minimum

use of CPU time.

The peripheral uses two external lines to perform

the protocols: SDA, SCL.

10.7.2 Main Features

Parallel-bus/I2C protocol converter

Multi-master capability

7-bit/10-bit Addressing

Standard I2C mode/Fast I2C mode

Transmitter/Receiver flag

End-of-byte transmission flag

Transfer problem detection

Interrupt generation on error conditions

Interrupt generation on transfer request and on

data received

I2C Master Features:

Start bit detection flag

Clock generation

I2C bus busy flag

Arbitration Lost flag

End of byte transmission flag

Transmitter/Receiver flag

Stop/Start generation

2C Slave Features:

Stop bit detection

I2C bus busy flag

Detection of misplaced start or stop condition

Programmable I2C Address detection (both 7-

bit and 10-bit mode)

General Call address programmable

Transfer problem detection

End of byte transmission flag

Transmitter/Receiver flag.

Interrupt Features:

Interrupt generation on error condition, on

transmission request and on data received

Interrupt address vector for each interrupt

source

Pending bit and mask bit for each interrupt

source

Programmable interrupt priority respects the

other peripherals of the microcontroller

Interrupt address vector programmable

DMA Features:

DMA both in transmission and in reception with

enabling bits

DMA from/toward both Register File and

Memory

End Of Block interrupt sources with the related

pending bits

Selection between DMA Suspended and DMA

Not-Suspended mode if error condition occurs.

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