Instruction Sets-Characteristics and Functions

In this post we will learn about the characteristics of machine instructions, the elements of a machine instruction,we will demonstrate instruction representation, discuss various types of addressing modes and also introduce types of operands and type of operations

             Characteristic of machine 

      instructions

The instructions the computer executes determines the operation of the processor. collection of  different types of instructions can be called the instruction set. what needs to be understood is that each instruction must contain the information required by the processor for execution

Elements of a Machine Instruction

Source and Result operand can be in the virtual/main memory, the processor register, I/O devices,or even Immediate where the value of the operand is contained in a  field in the instruction being executed.

Instruction Representation

Symbolic Representation of Machine Instruction: as EX. ADD,SUB,LOAD,DIV,MUL, are used in order to solve the problem of dealing with binary representation of instructions.

OPCODES are represented by abbreviations called mnemonics that indicate the operation.for Ex.

ADD is for addition

SUB is subtraction

so, say we want to add A and B together, the abbreviations will be

ADD A,B

Instruction Types

Data Processing: Arithmethic and Logic Unit Instructions

Data Storage: Memory Instructions

Data Movement:I/O Instructions

Program Flow Control: Test an Branch Instructions

Addresses

1 Address Example

2 Address Example

3 Address Example