Decw – NEC 78K/0 Series User Manual
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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.