8086-2 datasheet(27/30 Pages) INTEL

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8086

Table 2. Instruction Set Summary

(Continued)

Mnemonic and

Instruction Code

Description

ARITHMETIC

76543210

ADD

e Add:

Reg./Memory with Register to Either

0 0 0 0 0 0 d w

mod reg r/m

Immediate to Register/Memory

1 0 0 0 0 0 s w

mod 0 0 0 r/m

data

data if s: w

e 01

Immediate to Accumulator

0000010w

data

data if w

e 1

ADC

e Add with Carry:

Reg./Memory with Register to Either

0 0 0 1 0 0 d w

mod reg r/m

Immediate to Register/Memory

1 0 0 0 0 0 s w

mod 0 1 0 r/m

data

data if s: w

e 01

Immediate to Accumulator

0001010w

data

data if w

e 1

INC

e Increment:

1 1 1 1 1 1 1 w

mod 0 0 0 r/m

0 1 0 0 0 reg

AAA

e ASCII Adjust for Add

00110111

BAA

e Decimal Adjust for Add

00100111

SUB

e Subtract:

Reg./Memory and Register to Either

0 0 1 0 1 0 d w

mod reg r/m

Immediate from Register/Memory

1 0 0 0 0 0 s w

mod 1 0 1 r/m

data

data if s w

e 01

Immediate from Accumulator

0010110w

data

data if w

e 1

SSB

e Subtract with Borrow

Reg./Memory and Register to Either

0 0 0 1 1 0 d w

mod reg r/m

Immediate from Register/Memory

1 0 0 0 0 0 s w

mod 0 1 1 r/m

data

data if s w

e 01

Immediate from Accumulator

000111w

data

data if w

e 1

DEC

e Decrement:

1 1 1 1 1 1 1 w

mod 0 0 1 r/m

0 1 0 0 1 reg

NEG

e Change sign

1 1 1 1 0 1 1 w

mod 0 1 1 r/m

CMP

e Compare:

0 0 1 1 1 0 d w

mod reg r/m

Immediate with Register/Memory

1 0 0 0 0 0 s w

mod 1 1 1 r/m

data

data if s w

e 01

Immediate with Accumulator

0011110w

data

data if w

e 1

AAS

e ASCII Adjust for Subtract

00111111

DAS

e Decimal Adjust for Subtract

00101111

MUL

e Multiply (Unsigned)

1 1 1 1 0 1 1 w

mod 1 0 0 r/m

IMUL

e Integer Multiply (Signed)

1 1 1 1 0 1 1 w

mod 1 0 1 r/m

AAM

e ASCII Adjust for Multiply

11010100

00001010

DIV

e Divide (Unsigned)

1 1 1 1 0 1 1 w

mod 1 1 0 r/m

IDIV

e Integer Divide (Signed)

1 1 1 1 0 1 1 w

mod 1 1 1 r/m

AAD

e ASCII Adjust for Divide

11010101

00001010

CBW

e Convert Byte to Word

10011000

CWD

e Convert Word to Double Word

10011001

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