1. Microprocessors CSE- 341 Dr. Jia Uddin Assistant Professor, CSE, BRAC University Dr. Jia Uddin, CSE, BRAC University

2. Instruction Set and Addressing Modes Dr. Jia Uddin, CSE, BRAC University

3. Instruction Set Addressing Modes: a method of specifying an operand – Operands : in REG, Memory, I/O ports, and within Instruction * Control Transfer : direct, indirect addressing the modes available register addressing : REG immediate addressing: within Instruction direct addressing register indirect addressing based addressing indexed addressing based indexed addressing MEM or I/O Dr. Jia Uddin, CSE, BRAC University

4. Addressing Modes Dr. Jia Uddin, CSE, BRAC University

5. Addressing Modes Dr. Jia Uddin, CSE, BRAC University

6. Addressing Modes – Register Operand Addressing Mode can be accessed in byte, word, or double word sizes. MOV AX, BX Byte: AL, AH, BL, BH, CL, CH, DL, DH Word: AX, BX, CX, DX, SP, BP, SI, DI, CS, DS, SS, ES, FS, GS Double Word: EAX, EBX, ECX, EDX, ESP, EBP, ESI, EDI – Immediate Operand Addressing an operand is part of the instruction MOVAL, 15H 8 bits, 16 bits, and 32 bits in length Dr. Jia Uddin, CSE, BRAC University

7. Direct Addressing 16-bit Memory Operand Addressing Modes – 16-bit addressing modes – Physical address = Segment Base: EA(effective address) Segment Base Address(SBA) : the starting location of the segment EA : the offset of the operand from the beginning of the segment of memory EA = Base + Index + Displacement Base = BX or BP, Index = SI or DI, displacement = 8-bit or 16-bit Dr. Jia Uddin, CSE, BRAC University