Renesas H8/300 Series Programming Manual page 17

Table 1-4. Arithmetic Instructions
Instruction Size*
B/W
ADD
SUB
B
ADDX
SUBX
B
INC
DEC
W
ADDS
SUBS
B
DAA
DAS
B
MULXU
B
DIVXU
B/W
CMP
B
NEG
* Size: Operand size
B: Byte
W: Word
Function
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.
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.
Rd ± 1 → Rd
Increments or decrements a general register.
Rd ± 1 → Rd, Rd ± 2 → Rd
Adds or subtracts immediate data to or from data in a general
register. The immediate data must be 1 or 2.
Rd decimal adjust → Rd
Decimal-adjusts (adjusts to packed BCD) an addition or
subtraction result in a general register by referring to the CCR.
Rd × Rs → Rd
Performs 8-bit × 8-bit unsigned multiplication on data in two
general registers, providing a 16-bit result.
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.
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.
0 – Rd → Rd
Obtains the two's complement (arithmetic complement) of data in
a general register.
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