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NOP
Operation:
No operation
Description:
This single-byte instruction increments the PC and does nothing else.
No other CPU registers are affected. NOP is typically used to produce a
time delay, although some software disciplines discourage CPU fre-
quency-based time delays. During debug, NOP instructions are some-
times used to temporarily replace other machine code instructions, thus
disabling the replaced instruction(s).
Condition Codes and Boolean Formulas:
S
–
None affected.
Addressing Modes, Machine Code, and Execution Times:
Source Form
NOP
MOTOROLA
6-150
Null Operation
X
H
I
N
Z
–
–
–
–
–
Address Mode
INH
A7
INSTRUCTION GLOSSARY
V
C
–
–
Object Code
NOP
Cycles
Access Detail
1
O
CPU12
REFERENCE MANUAL
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