Freescale Semiconductor, Inc.
Technical Data — MC68HC912DG128
Section 15. Inter-IC Bus
15.1 Contents
15.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .273
15.3 IIC Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .274
15.4 IIC System Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . .276
15.5 IIC Protocol. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .276
15.6 IIC Register Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . .281
15.7 IIC Programming Examples . . . . . . . . . . . . . . . . . . . . . . . . . .290
15.2 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.
MC68HC912DG128 — Rev 3.0
Technical Data
Inter-IC Bus
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