Addressing mode_coa

Question

Define these terms and relationship among these.

-Absolute mode

-relative mode

-effective address

Comments

https://gateoverflow.in/?qa=blob&qa_blobid=2945518144653747998

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In simple words if i have to define then i will define in this way that we know that in order to execute any process(program under execution), we need cpu. what does CPU do??

 In order to perform any instructions which are present inside any program like (ADD, SUB, MUL ,MOV etc), CPU need to find out where these operands exist, on which it has to apply operations .

for eg: MOV R1,[2000]     // MOVE the contents(Data) of location 2000 to register R1

Let me define term: 

Effective Address : It is the address where  operands exist. For eg: 2000 is the effective Address in above instruction.

Absolute mode and Relative modes are different addressing modes.(Addressing modes are nothing but they specify different ways to indicate where operands exist)

Absolute mode(Direct mode):     ADD R2 , [3000]    // Add the contents of location 3000 to R2 register

Direct mode , in the sense we have got direct address of operand (effective Address) in the given instruction.

Relative addressing Mode : It is relative to PC (Program counter). It is used in program relocation at run time/

                                                 ADD R1, [3000]                                    PC:[2000] (It specify starting address of next address)

In order to calculate effective Address, operand value = [Effective Address]

                                                                               =[3000] + [2000]

                                                                               =[5000]

                        we are going to add the contents of location 5000 to the contents of register R1.

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Rather than seeking answer here , if you simply google and take the burden to study all possible resources for addressing modes, not only it will help to know your answer but also you will get to know more than your wish.