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MICROPROCESSOR
8086
Architecture, Programming and Interfacing
SUNIL MATHUR
Assistant Professor
Maharaja Agrasen Institute of Technology
Delhi
New Delhi-110001
2011
MICROPROCESSOR 8086: Architecture, Programming and Interfacing
Sunil Mathur
© 2011 by PHI Learning Private Limited, New Delhi. All rights reserved. No part of this book may be
reproduced in any form, by mimeograph or any other means, without permission in writing from the
publisher.
ISBN-978-81-203-4087-9
The export rights of this book are vested solely with the publisher.
Published by Asoke K. Ghosh, PHI Learning Private Limited, M-97, Connaught Circus,
New Delhi-110001 and Printed by Rajkamal Electric Press, Plot No. 2, Phase IV, HSIDC,
Kundli-131028, Sonepat, Haryana.
To
My Students
Contents
Preface
Acknowledgements
xix
xxiii
PART I
1.
Architecture and Organization of Microprocessors and
Microcomputers
1.1
1.2
1.3
1.4
1.5
1.6
Introduction
3
Computer Languages
3
1.2.1
Low-level Language
3
1.2.2
Machine Language
4
1.2.3
Assembly Language
4
1.2.4
High-level Language
4
Microprocessor
4
1.3.1
Arithmetic and Logic Unit
5
1.3.2
Register Unit
5
1.3.3
Control Unit
5
Microprocessor Operations
5
1.4.1
Microprocessor Initiated Operations
6
1.4.2
Internal Data Operations
7
1.4.3
Peripheral or Externally Initiated Operations
8085 Functional Description
9
Internal Architecture of 8085
9
1.6.1
Register Unit
10
1.6.2
Control Unit
12
1.6.3
Arithmetic Logic Unit
12
1.6.4
System Bus of 8085
14
v
8
3–26
vi
Contents
1.7
8085 Pin Description
14
1.7.1
Group 1: Power Supply and Frequency Signals
15