Microprocessor Architecture 8085 notes download pdf

Microprocessor Architecture 8085

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Microprocessor :

The microprocessor is a multipurpose, Programable, Register-based electronic device that reads only binary instructions.
It is fetched instructions from memory, decode and execute them.
It can be used to control processes or to turn On/Off the devices.
Microprocessor is a Programmable integrated device that capability is similar to the CPU.

Components of computer a block-diagram :

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1. Input :- User can enter the instructions and data into memory through devices are called Input device.

2. Arithmetic/Logical Unit (ALU) :- ALU is used for performing Arithmetic Operation such as Addition, Subtraction & Logical Operation such as AND, OR & EX-OR.

3. Memory :- Memory is used for storing binary information such as Instructions and Data.

4. Control unit :-

· Control unit provides the necessary timing and control signals to all the operations in Microprocessor.

· It controls the flow of data between Microprocessor, Memory and Peripherals.

· It instructs all the units to perform the task in a particular sequence.

5. Output :- A device that display the information are called output device.

e.g- CRTs (Cathode Ray Tubes)

LEDs (Light Emitting Diodes)

Printers etc.

Note :- In Computer system, ALU & Control unit are combined in one unit called CPU (Central Processing Unit).

Microprocessor based system with the Bus Architecture :

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Microprocessor, I/O & Memory are organized around a common communication path called Bus.
These components are connected physically through a Bus.
Microprocessor can be divided into three segments –

1) Arithmetic/Logical Unit (ALU) :- ALU unit performs Arithmetic Operations (ADD, SUB) and Logical Operation (AND, OR & EX-OR).

2) Register Array :- Microprocessor consists of various register such as B, C, D, H & L. These registers are used to store data temporary during execution of program.

3) Control Unit :- Control unit controls the flow of data between Microprocessor, Memory and Peripherals.

Machine language :

Machine language is only a language which is directly understood by a computer.
It is also called binary language as it is based on 0s or 1s.
It does not need a compiler or interpreter to run.

Assembly language :

Assembly language is basically a family of low level languages for programing Computer, Microprocessor, and Microcontroller etc.
Is implement a symbolic representation of numeric machine code called mnemonics.
Mnemonics helps the program to remember instructions, registers etc.
Assembler is used to translate assembly language.

High-level language :

It is only the instruction in English word which is use of English alphabets and Mathematical symbol like + , - , / , * etc.
High-level language is more close to user and easy to read and understand.
It is converted into binary/machine language with the help of interpreter or compiler.

Functions of various components of Microprocessor based system :

(1) Microprocessor :

· The microprocessor is a multipurpose, Programable, Register-based electronic device that reads only binary instructions.

· It is fetch instructions from memory, decode and execute them.

· It can be used to control processes or to turn On/Off the devices.

· Microprocessor is a Programmable integrated device that capability is similar to the CPU.

(2) Memory :

· Memory is used for storing binary information such as Instructions and Data in Microprocessor.

(3) Input/Output :

· User enter instructions and data into memory through devices such as keyboard, switches etc. That devices are called Input device.

· The result or information displayed by a device such the result or information displayed by a device such as the result of information displayed by a device such as LEDs, CRTs, Printers etc. That devices are called Output device.

Subjects

Microprocessor Architecture 8085 notes download pdf | B.Sc-[IT]