Arithmetic Operations - Renesas H8 Series Hardware Manual

2.5.2

Arithmetic Operations

Table 2.5 describes the arithmetic instructions.
Table 2.5 Arithmetic Instructions
Size *
Instruction
ADD B/W
SUB
ADDX B
SUBX
INC B
DEC
ADDS W
SUBS
DAA B
DAS
MULXU B
DIVXU B
CMP B/W
NEG B
Notes: * 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 on data in two general
registers, or addition or subtraction with carry 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 1 or 2 to or from a general register
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, and indicates the result in the CCR.
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
Rev. 6.00 Sep 12, 2006 page 33 of 526
Section 2 CPU
REJ09B0326-0600