NEC 78K/0 Series - Manual (Page 74)

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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 rp
[Flag]
Z AC CY
[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.