Programming for Microprocessors

4

General

introduction

It should

be

noted that the actual form

in

which the instructions are

stored

is

considerably different from

the one

shown above;

the

inten-

tion, however, is the same.

Figure

1.2

shows

the

internal structure

of

a control system based

on

a microprocessor.

A

vital feature

of

this structure

is

that

it

is the same

for

any

controller. Different control functions

can be

obtained simply

by changing

the

instructions held

in the

store.

In

the limit

a

micropro-

cessor

can

implement

any

control function,

no

matter how complex.

Store

for

instructions

Inputs

(digital)

Outpyts

(digital)

General

-

purpose

informat ion-handling

components ...