ST7FLCD1 datasheet(52/95 Pages) STMICROELECTRONICS

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I²C Single-Master Bus Interface

ST7FLCD1

52/95

I²C Single-Master Bus Interface

10.1

Introduction

The I²C Bus Interface serves as an interface between the microcontroller and the serial I²C bus. It

provides single-master functions, and controls all I²C bus-specific sequencing, protocol and timing.

It supports Fast I²C mode (400 kHz) and up to 800 kHz for certain applications.

10.2

Main Features

● Parallel / I²C bus protocol converter

● Interrupt generation

● Standard I²C mode/Fast I²C mode (up to 800 kHz for certain applications)

● 7-bit Addressing

I²C Single Master Mode

● End of byte transmission flag

● Transmitter /Receiver flag

● Clock generation

10.3

General Description

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

format and vice versa, using either an interrupt or a 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.

Mode Selection

The interface can operate in the two following modes:

1. Master transmitter/receiver,

2. Idle (default).

The interface automatically switches from Idle to Master mode after it generates a START condition

and from Master to Idle mode after it generates a STOP condition.

Communication Flow

The interface initiates a data transfer and generates the clock signal. A serial data transfer always

begins with a start condition and ends with a stop condition. Both start and stop conditions are

generated by software.

Data and addresses are transferred as 8-bit bytes, MSB first. The first byte following the start

condition is the address byte.

A 9th clock pulse follows the 8 clock cycles of a byte transfer, during which the receiver must send

an acknowledge bit to the transmitter. Refer to Figure 28.

Acknowledge is enabled and disabled by software.

The speed of the I²C interface is selected as Standard (0 to 100 kHz) and Fast I²C (100 to 400 kHz)

and up to 800 kHz for certain applications.

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