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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 on immediate data and data in a general
register.
INC
DEC
B
Rd
±
1
→
Rd
Increments or decrements a general register.
ADDS
SUBS
W
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.
DAA
DAS
B
Rd decimal adjust
→
Rd
Decimal-adjusts 4-bit BCD data in a general register by referring to
CCR.
MULXU
B
Rd
×
Rs
→
Rd
Performs 8-bit
×
8-bit unsigned multiplication on data in two general
registers, providing a 16-bit result.
DIVXU
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.
CMP
B/W
Rd – Rs, Rd – #IMM
Compares data in a general register with data in another general
register or with immediate data, and sets CCR according to the result.
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