MC912DG128ACPVE Datasheet, PDF (301/478 Pages) Freescale Semiconductor, Inc – Upward compatible with M68HC11 instruction set

Freescale Semiconductor, Inc.
Technical Data — MC68HC912DT128A
Section 17. Inter IC Bus
17.1 Contents
17.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301
17.3 IIC Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .302
17.4 IIC System Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 304
17.5 IIC Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 304
17.6 IIC Register Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 309
17.7 IIC Programming Examples . . . . . . . . . . . . . . . . . . . . . . . . . .318
17.2 Introduction
The Inter-IC Bus (IIC or I²C) is a two-wire, bidirectional serial bus that
provides a simple, efficient method of data exchange between devices.
Being a two-wire device, the IIC minimizes the need for large numbers
of connections between devices, and eliminates the need for an address
decoder.
This bus is suitable for applications requiring occasional
communications over a short distance between a number of devices. It
also provides flexibility, allowing additional devices to be connected to
the bus for further expansion and system development.
The interface is designed to operate up to 100kbps with maximum bus
loading and timing. The device is capable of operating at higher baud
rates, up to a maximum of clock/20, with reduced bus loading. The
maximum communication length and the number of devices that can be
connected are limited by a maximum bus capacitance of 400pF.
MC68HC912DT128A — Rev 4.0
MOTOROLA
Inter IC Bus
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Technical Data
301