2.2.3 ADDX
ADDX (ADD with eXtend carry)
Add with Carry
Operation
Rd + (EAs) + C
→
Rd
Assembly-Language Format
ADDX
<EAs>, Rd
Operand Size
Byte
Condition Code
H: Set to 1 if there is a carry at bit 3;
otherwise cleared to 0.
N: Set to 1 if the result is negative; otherwise
cleared to 0.
Z: Previous value remains unchanged 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 carry at bit 7;
otherwise cleared to 0.
I
UI
H
U
N
Z
V
C
—
—
↕
—
↕
↕
↕
↕
Description
This instruction adds the source operand and carry flag to the contents of an 8-bit register Rd
(destination register) and stores the result in the 8-bit register Rd.
Available Registers
Rd:
R0L to R7L, R0H to R7H
Rs:
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
ADDX
#xx:8, Rd
9
rd
IMM
2
Register direct
ADDX
Rs, Rd
0
E
rs
rd
2
No. of
States
Addressing
Mode
Mnemonic
Operands
46