Self doubt

Question

Can anyone please explain in simple terms indexed, relative and base register addressing modes?

Answer 1

RELATIVE ADD. MODE - WHEN THE TARGET INSTRUCTION PRESENT IN the SAME SEGMENT DURING the PROGRAM EXECUTION, CONTROL WILL TRANSFER, CALLED AS INTRA-SEGMENT 

Effective add. calculated by adding the relative value to a program counter

EA= PC+ADDRESS FIELD VALUE

BASE ADD. MODE - WHEN THE TARGET INSTRUCTION PRESENT IN DIFFERENT SEGMENT THEN DURING THE PROGRAM EXECUTION, CONTROL WILL TRANSFER B/W  THE SEGMENT CALLED AS INTER-SEGMENT,

EFFECTIVE ADD.= [BASE REG] + ADD. FIELD 

Comments

In relative addressing mode w.r.t   program counter ,  E.A= PC+ (ADDRESS FIELD VALUE - 1)