2.2.61 SUBX
SUBX (SUBtract with eXtend carry)
Subtract with Borrow
Operation
Rd – (EAs) – C
→
Rd
Assembly-Language Format
SUBX
<EAs>, Rd
Operand Size
Byte
Condition Code
H: Set to 1 if there is a borrow from bit 3;
otherwise cleared to 0.
N: Set to 1 if the result is negative; otherwise
cleared to 0.
Z: Set to 1 if the result is zero; otherwise
cleared to 0.
V: Set to 1 if an overflow occurs; otherwise
cleared to 0.
C: Set to 1 if there is a borrow from bit 7;
otherwise cleared to 0.
I
UI
H
U
N
Z
V
C
—
—
↕
—
↕
↕
↕
↕
Description
This instruction subtracts the source operand and carry flag from the contents of an 8-bit register
Rd (destination operand) and stores the result in the 8-bit register Rd.
Available Registers
Rd: R0L to R7L, R0H to R7H
Operand Format and Number of States Required for Execution
Notes
Instruction Format
1st byte
2nd byte
3rd byte
4th byte
Immediate
SUBX
#xx:8, Rd
B
rd
IMM
2
Register direct
SUBX
Rs, Rd
1
E
rs
rd
2
No. of
States
Addressing
Mode
Mnemonic
Operands
181