Datasheet

Chapter 8. I
2
C Module 8-1
Chapter 8
I
2
C Module
This chapter describes the MCF5407 I
2
C module, including I
2
C protocol, clock
synchronization, and the registers in the I
2
C programing model. It also provides extensive
programming examples.
8.1 Overview
I
2
C is a two-wire, bidirectional serial bus that provides a simple, efficient method of data
exchange, minimizing the interconnection between devices. This bus is suitable for
applications requiring occasional communications over a short distance between many
devices. The flexible I
2
C allows additional devices to be connected to the bus for expansion
and system development.
The I
2
C system is a true multiple-master bus including arbitration and collision detection
that prevents data corruption if multiple devices attempt to control the bus simultaneously.
This feature supports complex applications with multiprocessor control and can be used for
rapid testing and alignment of end products through external connections to an
assembly-line computer.
Note that I
2
C is defined for 5-V operation and the MCF5407 is a 3.3-V device. Care must
be taken to interface to 5-V peripherals.
8.2 Interface Features
The I
2
C module has the following key features:
• Compatibility with I
2
C bus standard
• Support for 3.3-V tolerant devices
• Multiple-master operation
• Software-programmable for one of 64 different serial clock frequencies
• Software-selectable acknowledge bit
• Interrupt-driven, byte-by-byte data transfer
• Arbitration-lost interrupt with automatic mode switching from master to slave
• Calling address identification interrupt