http://giihst.blogspot.in/p/computer-basics.html
A particular method of specifying the OPERAND for a MACHINE CODE instruction for some computer processors.
The simplest possible addressing modes are: REGISTER ADDRESSING, in which the operand is actually present in the specified register; IMMEDIATE ADDRESSING, where the operand value is supplied as part of the instruction, and ABSOLUTE ADDRESSING, also called direct addressing, where the memory address of the operand is given as part of the instruction.
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