Subs (Subtract With Sign Extension) - Hitachi H8/300L Series Programming Manual

2.2.54 SUBS (subtract with sign extension)

Operation
Rd - 1 → Rd
Rd - 2 → Rd
Assembly-Language Format
SUBS #1, Rd
SUBS #2, Rd
Operand Size
Word
Condition Code
I H
— — — —
I: Previous value remains unchanged.
H: Previous value remains unchanged.
N: Previous value remains unchanged.
Z: Previous value remains unchanged.
V: Previous value remains unchanged.
C: Previous value remains unchanged.
Description
This instruction subtracts the immediate value 1 or 2 from word data in a general register.
Unlike the SUB instruction, it does not affect the condition code flags.
The SUBS instruction does not permit byte operands.
Instruction Formats and Number of Execution States
Addressing
mode Mnem.
Register direct SUBS
Register direct SUBS
124
N Z V C
— — — —
Instruction code
Operands 1 st byte
#1, Rd 1 B
#2, Rd 1 B
2nd byte 3rd byte
0 0 rd
8 0 rd
No. of
4th byte states
2
2