Computer Organization and Architecture2021-222 marksInstruction types, formats, instruction cycles and sub cycle
What are the different types of instruction formats?
What are the different types of instruction formats?
The instruction format depends on the number of address fields. The types are:
- Three-address:
ADD R1, R2, R3. Two sources and one destination. - Two-address:
ADD R1, R2. The result replaces the first operand. - One-address:
ADD X. The other operand and the result are in the accumulator. - Zero-address:
ADD. Operands are on the stack, as in a stack machine.
Each format holds an opcode and zero to three operand fields. More addresses make the program short, but each instruction long.
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