Thursday, 20 December 2012

Addressing mode


By on 23:42

Addressing modes are the modes which are used to specified the address of data and operands.
Address of Operand also called as effective address.

Types of Addressing Modes:-


1)Direct Addressing Mode:-Direct Addressing Mode are the mode in which instruction itself contains the address of data.


2)Indirect Addressing Mode:-Indirect Addressing Mode are the mode in which instruction doesn't 
contain the address of data but instruction specified address of memory which contains the address of memory.

3)Immediate Addressing Mode:-In this mode operand is specified the instruction.

Some other type of Addressing Modes are:-


4)Register Addressing Mode:-In this mode op code contains the address of register.





5)Indirect Addressing Register Mode:-In this mode op code redirects to another register.





6)Auto Increment and Auto decrement Addressing Mode:-In this mode register is automatically 

incremented or decremented after its value is needed to access memory location.




Effective Address=Address of IP+Content of PC.


7)Index Addressing Mode:-In this mode effective address is equals to the address part of IR plus

Content of Index Register.




8)Base Addressing Mode:-In this mode effective address equals to content of bade address plus

Address part of IR.






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