Programming for Microprocessors

3

A diagram of a simple microprocessor system is shown in Figure 3.1.

There are four essential components:

• a store, which retains information and produces it when needed;

• a processing unit, which moves and processes data, and which exer-

cises control over the system;

• one or more peripheral interface units, which allow communication

with the outside world;

• a bus, which forms a communication link between all the other

parts.

Bus

TT"

Store

Peripheral

interface

Processing

unit

Peripheral

interface

Signals to and from

outside world

Figure 3.1

2

18

Basic structure of a

microprocessor