49
Type
Instruction
Size
*
1
Function
Arithmetic
operations
ADD
SUB
B/W/L
Rd ± Rs
→
Rd, Rd ± #IMM
→
Rd
Performs addition or subtraction on data in two general
registers, or on immediate data and data in a general
register. (Immediate byte data cannot be subtracted from
byte data in a general register. Use the SUBX or ADD
instruction.)
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/W/L
Rd ± 1
→
Rd, Rd ± 2
→
Rd
Increments or decrements a general register by 1 or 2.
(Byte operands can be incremented or decremented by
1 only.)
ADDS
SUBS
L
Rd ± 1
→
Rd, Rd ± 2
→
Rd, Rd ± 4
→
Rd
Adds or subtracts the value 1, 2, or 4 to or from data in a
32-bit register.
DAA
DAS
B
Rd decimal adjust
→
Rd
Decimal-adjusts an addition or subtraction result in a
general register by referring to the CCR to produce 4-bit
BCD data.
MULXU
B/W
Rd
×
Rs
→
Rd
Performs unsigned multiplication on data in two general
registers: either 8 bits
×
8 bits
→
16 bits or 16 bits
×
16 bits
→
32 bits.
MULXS
B/W
Rd
×
Rs
→
Rd
Performs signed multiplication on data in two general
registers: either 8 bits
×
8 bits
→
16 bits or 16 bits
×
16 bits
→
32 bits.
DIVXU
B/W
Rd ÷ Rs
→
Rd
Performs unsigned division on data in two general
registers: either 16 bits ÷ 8 bits
→
8-bit quotient and 8-bit
remainder or 32 bits ÷ 16 bits
→
16-bit quotient and 16-
bit remainder.
Summary of Contents for H8S/2645
Page 4: ......
Page 16: ......
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Page 110: ...78 ...
Page 120: ...88 ...
Page 132: ...100 ...
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Page 418: ...386 ...
Page 444: ...412 ...
Page 530: ...498 ...
Page 562: ...530 ...
Page 642: ...610 ...
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Page 837: ...805 A 2 Instruction Codes Table A 2 shows the instruction codes ...
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