78098 datasheet(74/129 Pages) NEC

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78098 Datasheet(PDF) 74 Page - NEC

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CHAPTER 5 EXPLANATION OF INSTRUCTIONS

User's Manual U12326EJ4V0UM

Decrement Word

DECW

Word Data Decrement

[Instruction format]

DECW dst

[Operation]

dst

← dst – 1

[Operand]

Mnemonic

Operand (dst)

DECW

[Flag]

ZAC

[Description]

•

The destination operand (dst) contents are decremented by only one.

•

Because this instruction is frequently used for decrement of a register (pointer) used for addressing, the Z,

AC and CY flag contents are not changed.

[Description example]

DECW DE; The DE register is decremented.

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