2.5.2
Arithmetic Operations
Table 2.5 describes the arithmetic instructions. See figure 2.6 in section 2.5.4, Shift Operations,
for their object codes.
Table 2.5 Arithmetic Instructions
Instruction
ADD
Size*
Function
B/W
Rd ± Rs → Rd, Rd + #imm → Rd
SUB
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.
Rd ± #imm → Rd
ADDS
SUBS
W
Adds or subtracts immediate data to or from data in a general
register. The immediate data must be 1 or 2.
DAA
DAS
B
Rd decimal adjust → Rd
Decimal-adjusts (adjusts to packed 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. 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.
Note: * Size: Operand size
B: Byte
W: Word
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