1. Addressing Mode Wannachai Wannasawade Department of Computer Education
Faculty of Technical Education, KMITNB.

2. Addressing Mode
ในการพัฒนาโปรแกรมต่าง ๆ มีการอ้างถึงตำแหน่งของข้อมูล ตามที่มีในคำสั่งของไมโครโพรเซสเซอร์ ซึ่งมีหลายวิธีในการติดต่อ ดังนั้นสิ่งที่จะต้องเรียนรู้คือ Addressing Mode หรือวิธีการอ้างตำแหน่ง
วิธีการอ้างตำแหน่งแบ่งได้ 3 แบบคือ
Data Addressing Mode
Program Memory Addressing Mode
Stack Memory Addressing Mode

3. Data 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

4. Data Addressing Mode Register Addressing
Transfer byte or word from source register or memory location to destination register or memory location

5. Data Addressing Mode
MOV BX,CX

6. Data Addressing Mode Immediate Addressing
Transfer source immediate byte or word of data into the destination register or memory location

7. Data Addressing Mode
MOV EAX,13456H

8. Data Addressing Mode Direct Addressing
Moves 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

9. Data Addressing Mode

10. Data Addressing Mode
MOV AL,[1234H]

11. Data Addressing Mode Register Indirect Addressing
Transfer byte or word between register and memory location address by index or base register

12. Data Addressing Mode
MOV AX,[BX]

13. Data Addressing Mode Base-Plus-Index Addressing
Transfer byte or word between register and memory location address by base register (BX or BP) plus index register (DI or SI)

14. Data Addressing Mode
MOV DX,[BX+DI]

15. Data Addressing Mode Register-Relative Addressing
Moves byte or word between register and memory location address by index or base register plus displacement

16. Data Addressing Mode
MOV AX,[BX+1000H]

17. Data Addressing Mode Base Relative-Plus-Index Addressing
Transfer byte or word between register and memory location address by base register and index register plus displacement

18. Data Addressing Mode
MOV AX,[BX+SI+1000H]

19. Data Addressing Mode Scale-Index Addressing
Available 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

20. Program Memory Addressing Mode
Used with the JMP and CALL instruction
มีใช้งาน 3 แบบคือ
Direct Program Memory Addressing
Relative Program Memory Addressing
Indirect Program Memory Addressing

21. Direct Program Memory Addressing
What many early microprocessors used for all jumps and calls and also used in high-level languages. For example, JMP [10000H]
Opcode
Offset(low)
Offset(High)
Segment(high)
Segment(low)
E A
0 0
1 0
Used in intersegment jumps or often called far jump

22. Relative 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 jump or call (+127 and -128 byte from next instruction) and near jump or call (64K bytes)

23. Indirect Program Memory Addressing
Allows several forms of program indirect memory addressing for JMP and CALL. This type of jump is sometimes called indirect-indirect or double-indirect jump
Examples of indirect program memory addressing
JMP AX
JMP CX
JMP NEAR PTR [BX]
JMP TABLE [BX]
JMP ECX

24. Stack Memory Addressing Mode
The stack plays an importance role in all microprocessor. It holds data temporarily and stores return address of procedures. Used by PUSH and POP that maintained by two register
Stack Pointer register (SP or ESP)
Stack Segment register (SS)

25. Stack Memory Addressing Mode
PUSH and POP a) PUSH BX b) POP CX

26. Instruction Set
เป็นกลุ่มคำสั่งที่ไมโครโพรเซสเซอร์รู้จักและเข้าใจ ซึ่งสามารถแบ่งเป็นกลุ่มต่าง ๆ ได้ดังนี้
Data Movement Instructions
Arithmetic and Logic Instructions
Program Control Instructions

27. Data Movement Instructions
MOV Instruction
Opcode 1-2 bytes
MOD-REG-R/M
0-1 bytes
Displacement
0-1 bytes
Immediate
0-2 bytes
16 bits Instruction mode
Address size
0-1 bytes
Operand size
0-1 bytes
Opcode
1-2 bytes
MOD-REG-R/M
0-1 bytes
Scaled-index
0-1 bytes
Displacement
0-4 bytes
Immediate
0-4 bytes
32 bits Instruction mode
(80386,80486 and Pentium)

28. Data Movement Instructions
PUSH and POP
Load-Effective Address
LEA LDS LES
LFS LGS LSS
String Data Transfer
LODS STOS MOVS
INS OUTS
XCHG
LAHF and SAHF
XLAT
IN and OUT

29. Data Movement Instructions
MOVSX and MOVZX
BSWAP
CMOV
Segment Override Prefix

30. Arithmetic and Logic Instructions
Addition
Register Addition
Immediate Addition
Memory to Register Addition
Array Addition
Increment Addition
Addition with Carry

31. Arithmetic and Logic Instructions
Subtraction
Register Subtraction
Immediate Subtraction
Decrement Subtraction
Subtract with Borrow

32. Arithmetic and Logic Instructions
Comparison
CMP (Compare)
CMPXCHG (Compare and Exchange) used in Pentium

33. Arithmetic and Logic Instructions
Multiplication
8 bit Multiplication
16 bit Multiplication
Special Immediate 16 bit Multiplication
32 bit Multiplication

34. Arithmetic and Logic Instructions
Division
8 bit Division
16 bit Division
32 bit Division

35. Arithmetic and Logic Instructions
BCD and ASCII
BCD Arithmetic
DAA
DAS
ASCII Arithmetic
AAA
AAD
AAM
AAS

36. Arithmetic and Logic Instructions
Basic Logic
AND OR
XOR
TEST and Bit Test
NOT and NEG

37. Arithmetic and Logic Instructions
Shift
SHL
SHR
SAR
SAL
SHLD
SHRD

38. Arithmetic and Logic Instructions
Rotate
ROL
ROR
RCL
RCR

39. Arithmetic and Logic Instructions
Bit Scan Instruction
BSF
BSR
String Comparisons
SCAS
CMPS

40. Program Comtrol Instructions
Jump Group
Unconditional Jump (JMP)
Short Jump
Near Jump
Far Jump
Jumps with Register Operands
Indirect Jumps Using Index

41. Program Comtrol Instructions
Jump Group
Conditional Jump and Condition Sets
JA JAE JB JBE
JC JE or JZ JG JGE
JL JLE JNC JNE or JNZ
JNO JNS JNP or JPO JO
JP or JPE JS JCXZ JECXZ
LOOP Condition LOOPs

42. Program Comtrol Instructions
Procedures
CALL
Near CALL
Far CALL
CALL with Register Operands
CALL with Indirect Memory Address
RET

43. Program Comtrol Instructions
Other Instructions
Interrupt Instructions
INT X
IRET/IRETD
WAIT
HLT
NOP

44. Program Comtrol Instructions
Other Instructions
LOCK Prefix
ESC
BOUND
ENTER and LEAVE