AMX 68000 User Manual download pdf (Page 38)

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AMX 68000 Target Guide

4.4 Defining a Fast Clock ISP

At least one of your ISPs must service a clock interrupt which provides AMX with its

fundamental clock tick at the frequency and resolution defined in your AMX System

Configuration Module. For many applications, your clock ISP will just be a standard

AMX conforming ISP defined in the ISP Definition window. It is distinguished from all

other ISPs by picking

Clock Handler as its ISP Type.

Rarely does the Interrupt Handler for your AMX clock ISP have to do anything except

dismiss the clock interrupt request. This is frequently accomplished by simply writing a

command to a device I/O port. For such clocks, the AMX Configuration Builder lets you

create a fast clock ISP without having to write any code at all.

To create a fast clock ISP, go to the ISP Definition window, click on the

Add button and

select

Fast Clock Handler as the ISP Type. Then fill in the description of the operating

characteristics of your clock device. The layout of the window is shown below.

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AMX 68000 User Manual Page 38