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Dinesh Kumar, Lovely Professional University Unit 6: The 8085 Microprocessor Architecture

Unit 6: The 8085 Microprocessor Architecture Notes

CONTENTS

Objectives
Introduction
6.1 The 8085 Architecture
6.1.1 The 8085 Pin Diagram

6.1.2 Pin Details
6.2 Internal Architecture of 8085
6.2.1 Register organization

6.2.2 Timing and Control Unit
6.2.3 Address Buffer and Address Data Buffer
6.2.4 Interrupt Controls
6.2.5 Serial Input/Output Control

6.2.6 Addressing Modes of 8085
6.2.7 Timing Diagram of 8085
6.2.8 Read Cycle of 8085

6.2.9 Write Machine Cycle
6.2.10 Power on Reset of CPU
6.3 Summary

6.4 Keywords
6.5 Self-Assessment Questions
6.6 Review Questions
6.7 Further Reading

Objectives

After studying this unit, you will able to understand the following:
• Discuss the 8085 architecture
• Explain the internal architecture of 8085

Introduction

8085 microprocessor was introduced by Intel in the year 1976. This microprocessor is an update
of 8080 microprocessor. The 8080 processor was updated with Enable/Disable instruction pins
and Interrupt pins to form the 8085 microprocessor. Let us discuss the architecture of 8085
microprocessor in detail.
Before knowing about the 8085 architecture in detail, lets us briefly discuss about the basic features
of 8085 processor. 8085 microprocessor is an 8-bit microprocessor with a 40 pin dual in line package.

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