Introduction

In the previous blocks of this course, we have discussed concepts relating to CPU organization, register set. instruction set, addressing modes with a few examples. Let us look at one microprocessor architecture in regard of all the above concepts. We have selected one of the simplest processors 8086, for this purpose. Although the processor technology is old, all the concepts are valid for higher end Intel processor. 'Therefore, in this unit. w will discuss the 8086 microprocessor in some detail.

We have started the discussion of the basic microcomputer architecture. This discussion is followed by the details on the components of CPU of the 8086 microprocessor. Then we have discussed the register organization for this processor. We have also discussed the instruction set and addressing modes for this processor.

Objectives

After going through this unit, you should be able to:

• describe the features of the 8086 microprocessor;
• list various components of the 8086 microprocessor; and
• identify the instruction set and the addressing modes of the 8086 microprocessor