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CHAPTER 6 DETAILED RULES FOR EXECUTION INSTRUCTIONS
6.32 DECW (DECrement Word Data of Stack Pointer)
Decrement word data of SP by one.
■ DECW (DECrement Word Data of Stack Pointer)
Operation
(SP) ← (SP) - 1 (Word subtraction)
Assembler format
DECW SP
Condition code (CCR)
+: Changed by executing instruction
-: Not changed
N: Not changed
Z: Not changed
V: Not changed
C: Not changed
Number of execution cycle: 1
Byte count: 1
OP code: D1
NZVC
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