None
NOPUnsized
The no operation instruction, NOP performs no computation. Execution continues with the instruction following the NOP instruction. The processor's state is not modified by a NOP.
NOPs can be used to introduce a delay in code. Some programmers use them to provide space for patches - two or more NOPs can later be replaced by branch or jump instructions to fix a bug. This use of the NOP is seriously frowned upon, as errors should be corrected by re-assembling the code rather than by patching it.
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From MOTOROLA M68000 FAMILY Programmer's reference manual. Copyright 1992 by Motorola Inc./NXP. Adapted with permission.