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Bill of right

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Bill of right
8086 Addressing Modes for accessing data
Addressing modes provide convenience in accessing data needed in an instruction.
8086 Addressing Modes for accessing data

Immediate
Addressing mode
(for source operand only)

Register addressing

Memory addressing

I/O port addressing

Immediate Addressing
Before
Ex1: MOV DX, 1234H

DX ABCDH

After
1234H

Before
Ex2: MOV CH, 23H

CH

After

4DH

23H

Register Addressing
Before
Ex1: MOV CX, SI

After

CX 1234H

5678H

SI 5678H

5678H

Before
Ex2: MOV DL, AH

After

Dl

89H

BCH

AH

BCH

BCH

Memory Addressing
Direct Addressing

Indirect Addressing

Memory Indirect Addressing

Register
Indirect

Based Addressing Indexed with Addressing with displacement displacement

Based
Based Indexed
Indexed
addressing with addressing displacement

Memory Direct Addressing
Before
Ex1: MOV BX, DS:5634H

BX
DS:5634H
DS:5635H

ABCDH

8645H

45H
86H

LS byte
MS byte

Before
Ex2: MOV CL, DS:5634H

CL

F2H

DS:5634H
DS:5635H

After

45H
86H

Ex3: MOV BH, LOC
Program
.DATA
LOC DB 78H

After

Before
BH

C5H

45H

After
78H

Register Indirect Addressing
Before
Ex1: MOV CL, [SI]

CL

20H

SI

3456H

DS:3456H

DX

F232H

BX

After

A2B2H

DS:A2B2H
DS:A2B3H

67H
35H
Before

Ex3: MOV AH, [DI]

78H

78H
Before

Ex2: MOV DX, [BX]

After

AH

30H

DI

3400H

DS:3400H

86H

3567H

LS byte
MS byte
After
86H

Only SI, DI and BX can be used inside [ ] from memory addressing point of view. From user point of view [BP] is also possible. This scheme provides 3 ways of addressing an operand in memory.
Based Addressing with displacement
Before
Ex1: MOV DH, 2345H[BX]

DH

2345H is 16-bit displacement
4000 + 2345 = 6345H

45H

45H is 8-bit displacement
3000 + 45 = 3045H
It is SS when BP is used

67H

BX 4000H
DS:6345H

67H

Before
Ex2: MOV
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