HCS08 datasheet(208/290 Pages) MOTOROLA

208 / 290 page

Inter-Integrated Circuit (IIC) Module

MC9S08GB/GT

208

MOTOROLA

13.1 Introduction

The inter-integrated circuit (IIC) provides a method of communication between a number of devices. The

interface is designed to operate up to 100 kbps 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 400 pF.

For additional detail, please refer to volume 1 of the HCS08 Reference Manual, (Motorola document order

number HCS08RMv1/D).

13.1.1 Features

The IIC includes these distinctive features:

•

Compatible with IIC bus standard

•

Multi-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

•

START and STOP signal generation/detection

•

Repeated START signal generation

•

Acknowledge bit generation/detection

•

Bus busy detection

13.1.2 Modes of Operation

TIIC functions the same in normal and monitor modes. A brief description of the IIC in the various MCU

modes is given here.

•

Run mode — This is the basic mode of operation. To conserve power in this mode, disable the

module.

•

Wait mode — The module will continue to operate while the MCU is in wait mode and can provide

a wake-up interrupt.

•

Stop mode — The IIC is inactive in stop3 mode for reduced power consumption. The STOP

instruction does not affect IIC register states. Stop1 and stop2 will reset the register contents.

13.1.3 Block Diagram

Figure 13-2 is a block diagram of the IIC.

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