addressing mode wannachai wannasawade department of computer education faculty of technical...

Addressing Mode

Wannachai WannasawadeDepartment of Computer Education

Faculty of Technical Education, KMITNB.

2

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วิ%ธี�การอ้�างต่�าแหน�งแบ่�งได� วิ%ธี�การอ้�างต่�าแหน�งแบ่�งได� 3 3 แบ่บ่คำ+อ้แบ่บ่คำ+อ้ Data Addressing ModeData Addressing Mode Program Memory Addressing ModeProgram Memory Addressing Mode Stack Memory Addressing ModeStack Memory Addressing Mode

3Data Addressing ModeData Addressing Mode Register addressing Immediate addressing Direct addressing Register indirect address Base-plus-index addressing Register relative addressing Base relative-plus-index addressing Scaled-index address

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Register AddressingRegister AddressingTransfer byte or word from source register or memory location to destination register or memory location

Data Addressing ModeData Addressing Mode

5Data Addressing ModeData Addressing ModeMOV BX,CX

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Immediate AddressingImmediate AddressingTransfer source immediate byte or word of data into the destination register or memory location

Data Addressing ModeData Addressing Mode

7Data Addressing ModeData Addressing ModeMOV EAX,13456H

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Direct AddressingDirect AddressingMoves byte or word between a memory location and register

Direct Addressing move between memory location and AL,AX or EAX Displacement Addressing applies to almost any instruction in the instruction set

Data Addressing ModeData Addressing Mode

9Data Addressing ModeData Addressing Mode

10Data Addressing ModeData Addressing ModeMOV AL,[1234H]

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Register Indirect AddressingRegister Indirect AddressingTransfer byte or word between register and memory location address by index or base register

Data Addressing ModeData Addressing Mode

12Data Addressing ModeData Addressing ModeMOV AX,[BX]

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Base-Plus-Index AddressingBase-Plus-Index AddressingTransfer byte or word between register and memory location address by base register (BX or BP) plus index register (DI or SI)

Data Addressing ModeData Addressing Mode

14Data Addressing ModeData Addressing ModeMOV DX,[BX+DI]

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Register-Relative AddressingRegister-Relative AddressingMoves byte or word between register and memory location address by index or base register plus displacement

Data Addressing ModeData Addressing Mode

16Data Addressing ModeData Addressing ModeMOV AX,[BX+1000H]

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Base Relative-Plus-Index AddressingBase Relative-Plus-Index AddressingTransfer byte or word between register and memory location address by base register and index register plus displacement

Data Addressing ModeData Addressing Mode

18Data Addressing ModeData Addressing ModeMOV AX,[BX+SI+1000H]

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Scale-Index AddressingScale-Index AddressingAvailable 80386-Pentium used second register of pair of register is modified by the scale factor of 2X, 4X or 8X to generate the operand memory address

Data Addressing ModeData Addressing Mode

20Program Memory Program Memory Addressing ModeAddressing ModeUsed with the JMP and CALL

instruction

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Direct Program Memory Direct Program Memory

AddressingAddressing

Relative Program Relative Program

Memory AddressingMemory Addressing

Indirect Program Indirect Program

Memory AddressingMemory Addressing

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OpcodeOffset(low)Offset(High) Segment(high)Segment(low)

E A 0 0

0 0

0 0

1 0

Direct Program Memory AddressingDirect Program Memory AddressingWhat many early microprocessors

used for all jumps and calls and also

used in high-level languages. For

example, JMP [10000H]

Used in intersegment jumpsintersegment jumps or often called ffar jumpar jump

22Relative Program Memory AddressingRelative Program Memory Addressing

Not available in all early

microprocessors, but available to

some family of microprocessors.

Relative means relative to

instruction Pointer (IP) used in

short jumpshort jump or call (+127 and -

128 byte from next instruction)

and near jumpnear jump or call (64K bytes)

23Indirect Program Memory AddressingIndirect Program Memory AddressingAllows several forms of program indirect memory addressing for JMP and CALL. This type of jump is sometimes called indirect-indirectindirect-indirect or double-indirect jumpdouble-indirect jumpExamples of indirect program memory addressing

JMP AXJMP CXJMP NEAR PTR [BX]JMP TABLE [BX]JMP ECX

24Stack Memory Addressing ModeStack Memory Addressing Mode

The stack plays an importance

role in all microprocessor. It

holds data temporarily and

stores return address of

procedures. Used by PUSHPUSH and

POPPOP that maintained by two

register

Stack Pointer register (SP

or ESP)

Stack Segment register

(SS)

25Stack Memory Addressing ModeStack Memory Addressing ModePUSH and POP a) PUSH BXPUSH BX b) POP CXPOP CX

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ได�ด�งน�( Data Movement

Instructions

Arithmetic and Logic

Instructions

Program Control

Instructions

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Opcode 1-2 bytesMOD-REG-R/M

0-1 bytesDisplacement

0-1 bytesImmediate0-2 bytes

16 bits Instruction mode

Opcode 1-2 bytes

MOD-REG-R/M0-1 bytes

Displacement0-4 bytes

Immediate0-4 bytes

Scaled-index0-1 bytes

Operand size0-1 bytes

Address size0-1 bytes

32 bits Instruction mode(80386,80486 and Pentium)

MOV InstructionMOV Instruction

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PUSH and POP Load-Effective Address

LEA LDS LESLFS LGS LSS

String Data TransferLODS STOS MOVSINS OUTS

XCHG LAHF and SAHF XLAT IN and OUT

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MOVSX and MOVZX

BSWAP

CMOV

Segment Override Prefix

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AdditionAddition Register Addition Immediate Addition Memory to Register Addition Array Addition Increment Addition Addition with Carry

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SubtractionSubtraction Register Subtraction Immediate Subtraction Decrement Subtraction Subtract with Borrow

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ComparisonComparison CMP (Compare) CMPXCHG (Compare and Exchange) used in 80486 - Pentium

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MultiplicationMultiplication 8 bit Multiplication 16 bit Multiplication Special Immediate 16 bit Multiplication 32 bit Multiplication

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DivisionDivision 8 bit Division 16 bit Division 32 bit Division

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BCD and ASCIIBCD and ASCII BCD Arithmetic

DAA DAS

ASCII Arithmetic AAA AAD AAM AAS

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Basic LogicBasic Logic AND OR XOR TEST and Bit Test NOT and NEG

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Shift Shift SHL SHR SAR SAL SHLD SHRD

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RotateRotate ROL ROR RCL RCR

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Bit Scan InstructionBit Scan Instruction BSF BSR

StringString ComparisonsComparisons SCAS CMPS

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Jump GroupJump Group Unconditional Jump (JMP)

Short Jump Near Jump Far Jump Jumps with Register Operands Indirect Jumps Using Index

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Jump GroupJump Group Conditional Jump and Condition SetsJA JAE JB JBEJC JE or JZ JG JGEJL JLE JNC JNE or JNZJNO JNS JNP or JPO JOJP or JPE JS JCXZJECXZLOOP Condition LOOPs

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ProceduresProcedures CALL

Near CALL Far CALL CALL with Register Operands CALL with Indirect Memory Address

RET

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Other InstructionsOther Instructions Interrupt Instructions

INT X IRET/IRETD

WAIT HLT NOP

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Other InstructionsOther Instructions LOCK Prefix ESC BOUND ENTER and LEAVE