2.5.2
Arithmetic Operations
Table 2-5 describes the arithmetic instructions.
Table 2-5 Arithmetic Instructions
Instruction
Size*
Function
ADD
SUB
B/W
Rd ± Rs → Rd, Rd + #IMM → Rd
Performs addition or subtraction on data in two general registers, or
addition on immediate data and data in a general register.
Immediate data cannot be subtracted from data in a general register.
Word data can be added or subtracted only when both words are in
general registers.
ADDX
SUBX
B
Rd ± Rs ± C → Rd, Rd ± #IMM ± C → Rd
Performs addition or subtraction with carry or borrow on byte data in
two general registers, or addition or subtraction on immediate data
and data in a general register.
INC
B
Rd ± 1 → Rd
DEC
Increments or decrements a general register by 1.
Rd ± 1 → Rd, Rd ± 2 → Rd
ADDS
SUBS
W
B
Adds or subtracts 1 or 2 to or from a general register
Rd decimal adjust → Rd
DAA
DAS
Decimal-adjusts (adjusts to 4-bit BCD) an addition or subtraction
result in a general register by referring to the CCR
MULXU
DIVXU
CMP
B
Rd × Rs → Rd
Performs 8-bit × 8-bit unsigned multiplication on data in two general
registers, providing a 16-bit result
B
Rd ÷ Rs → Rd
Performs 16-bit ÷ 8-bit unsigned division on data in two general
registers, providing an 8-bit quotient and 8-bit remainder
B/W
Rd – Rs, Rd – #IMM
Compares data in a general register with data in another general
register or with immediate data, and indicates the result in the CCR.
Word data can be compared only between two general registers.
NEG
B
0 – Rd → Rd
Obtains the two’s complement (arithmetic complement) of data in a
general register
Notes: * Size:Operand size
B: Byte
W: Word
32
ETC [ ETC ]
