NOP instruction is empty operation instruction, mainly used for short   circuit, change the circuit function and program debugging use.
After adding some empty operation instructions to the program, there is no effect on the result of the logic operation. However, when the program is changed later, replacing the empty operation instruction with other   instructions can reduce the program number. Figure 1 shows an example of a NOP instruction. The number of empty operation instructions can be increased as needed.
In the case of

If you want to use empty operation instructions to replace LD, LDI, ANB, ORB instructions, the circuit will have a more substantial change, must pay attention.

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