Addressing modes
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4 Terms
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Immediate Addressing
The operand value is stored directly inside the opcode, so the CPU uses it immediately and doesn’t need to access memory to fetch it.
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Direct Addressing
The value in the opcode is the actual memory address of the data, so the CPU uses that address to fetch the required value from memory.
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Indirect Addressing
The value in the opcode is the address of a memory location that contains another address, that second address holds the required data.
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Indexed Addressing
The value in the opcode is added to the index register to calculate the memory location of the required data. Some CPUs then increment the index register automatically.
Note 
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