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CHAPTER 6 DETAILED RULES FOR EXECUTION INSTRUCTIONS
6.29 DECW (DECrement Word Data of Accumulator)
Decrement word data of A by one.
■ DECW (DECrement Word Data of Accumulator)
Operation
(A) ← (A) - 1 (Word subtraction)
Assembler format
DECW A
Condition code (CCR)
+: Changed by executing instruction
-: Not changed
N: Set to 1 if the MSB is 1 as the result of operation and set to 0 in other cases.
Z: Set to 1 if the result of operation is 0000
H
and set to 0 in other cases.
V: Not changed
C: Not changed
Number of execution cycle: 1
Byte count: 1
OP code: D0
NZVC
++- -