8085 Microprocessor

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The microprocessor forms the core of modern digital and embedded systems and plays a vital role in the functioning of computers, automation systems, and electronic devices. Among early microprocessors, the...

Name : 8085 Microprocessor
Vendor : Prashant Publication
Type : S.Y.B.Sc. SEM IV EL-223 (MIN)
Barcode : 978-93-47157-16-5

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INTERNATIONAL	XS	S	M	L	XL	XXL	XXXL
EUROPE	32	34	36	38	40	42	44
US	0	2	4	6	8	10	12
CHEST FIT (INCHES)	28"	30"	32"	34"	36"	38"	40"
CHEST FIT (CM)	716	76	81	86	91.5	96.5	101.1
WAIST FIR (INCHES)	21"	23"	25"	27"	29"	31"	33"
WAIST FIR (CM)	53.5	58.5	63.5	68.5	74	79	84
HIPS FIR (INCHES)	33"	34"	36"	38"	40"	42"	44"
HIPS FIR (CM)	81.5	86.5	91.5	96.5	101	106.5	111.5
SKORT LENGTHS (SM)	36.5	38	39.5	41	42.5	44	45.5

The microprocessor forms the core of modern digital and embedded systems and plays a vital role in the functioning of computers, automation systems, and electronic devices. Among early microprocessors, the 8085 Microprocessor holds great educational importance as it provides a strong foundation for understanding microprocessor architecture, programming, and interfacing concepts. This textbook, “EL-223: 8085 Microprocessor,” has been prepared to introduce students to the fundamentals of microprocessor systems in a simple and practical manner.
The book focuses on the architecture and operation of the 8085 Microprocessor. The contents include an introduction to microprocessors, internal architecture of the 8085, instruction set and addressing modes, assembly language programming. The concepts are explained with clear descriptions, diagrams, examples, and step-by-step programs to help students understand both theoretical principles and practical implementation.
This textbook aims to develop analytical thinking, problem-solving ability, and programming skills among undergraduate students. It will be useful for students, teachers, and beginners who wish to gain a clear and systematic understanding of microprocessor fundamentals and applications.
The author expresses sincere gratitude and heartfelt thanks to Mr. Rangrao Patil, Prashant Publication, Jalgaon, for his valuable guidance, encouragement, and support in bringing this textbook to publication.
Constructive suggestions from readers for further improvement of the book will be gratefully acknowledged.

Chapter 1…………………………………………………………………………………… 7
Microprocessor Basics
1.1 Introduction
1.2 Feature of 8085
1.3 Microprocessor Architecture and function of each block
1.3.1 Arithmetic and logic unit (ALU)
1.3.2 Flags
1.3.3 Register Array
1.3.4 Instruction Register and Decoder
1.3.5 Concept of Interrupts
1.3.6 Serial input and output
1.4 The 8085 Pin Diagram and Function of each pin
1.4.1 Address and Data Bus (A15 – A8, AD7 – AD0)
1.4.2 Control and Status signals
1.4.3 Power supply and clock frequency
1.4.4 Externally Initiated signals
1.4.5 Serial I/O Pins
1.5 De-multiplexing the Bus (AD7 – AD0)
1.6 Programming Model of 8085 Microprocessor
1.7 Signal Description
1.7.1 Clock Signal or T-State
1.7.2 Single line signal
1.7.3 Multiple line signal
1.7.4 Machine cycle
1.7.5 Instruction cycle
Chapter 2…………………………………………………………………………………. 22
Instruction Set and Programming
2.1 Study of Addressing Modes in 8085
2.1.1 Implied Addressing
2.1.2 Register Addressing
2.1.3 Immediate Addressing2.1.4 Direct Addressing
2.1.5 Register Indirect Addressing
2.2 Instruction set of 8085
2.2.1 Data Transfer Group
2.2.2 Arithmetic Group
2.2.3 Logical Group
2.2.4 Branching Group
2.2.5 Machine control group
Chapter 3…………………………………………………………………………………. 67
Assembly Language Programming
3.1 Assembly Language Programming structure
3.2 Arithmetic Program
3.3 Code conversion Program
Chapter 4…………………………………………………………………………………. 85
Microprocessor and Interfacing Applications
4.1 Programmable Peripheral Interface (PPI) IC 8255
4.1.1 Pin diagram of the 8255A
4.1.2 Block Diagram of 8255
4.2 Operation Modes of 8255
4.3 Control word formats