NOP -- No Operation

NOP -- No Operation Opcode Instruction Clocks Description 90 NOP 3 No operation Description NOP performs no operation. NOP is a one-byte instruction that takes up space but affects none of the machine context except (E)IP. NOP is an alias mnemonic for the XCHG (E)AX, (E)AX instruction. Flags Affected None Protected Mode Exceptions None Real Address Mode Exceptions None Virtual 8086 Mode Exceptions None