Addressing Modes of 8085 Microprocessor.
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This document discusses the different addressing modes of the Intel 8085 microprocessor. It describes 5 addressing modes: immediate, register, direct, indirect, and implied. Immediate mode embeds data in the instruction. Register mode transfers data between registers. Direct mode specifies the operand address in the instruction. Indirect mode uses a register pair to hold the operand address. Implied mode uses just the opcode to specify the operands.
![The memory address where the operand located is
specified by the contents of a register pair.
Examples :
LDAX B
MOV A, M (M: H-L pair in 8085)
Immediate Indirect MVI M,55H
Register Indirect ADC M [A A +Cy+(M)]
DCR M [(HL)(HL)+1]
PUSH PSW
Indirect Addressing Mode
Indirect Addressing Mode](https://image.slidesharecdn.com/8085addressingmodeshabibur-200827150015/85/Addressing-Modes-of-8085-Microprocessor-6-320.jpg)
Addressing Modes of 8085 Microprocessor.
- 1. Presented By Prof. Sk Habibur Rahaman Techno India University, West Bengal Intel 8085µP Addressing Modes
- 2. The number & Different kind of ways the programmer can refer to data stored in the memory. The different ways that a microprocessor can access data are referred to as Addressing modes: Immediate Addressing mode Register Addressing mode Direct Addressing mode Indirect Addressing mode Implied Addressing mode Addressing Modes Addressing Modes
- 3. 8 or 16 bit data can be specified as a part of the Instruction. The instruction having ‘I’ (Immediate) letter fall under this category. Examples : MVI A, 25H MVI C, 7CH LXI H, 2450H ADI 87H Immediate Addressing Mode Immediate Addressing Mode
- 4. Data transfer between Registers. Specifies the Source ,Destination or Both Operand in an 8085 registers. Faster Execution (it is not necessary to access memory locations ) Examples : MOV A, B ADD E XCHG Register Addressing Mode Register Addressing Mode
- 5. Specifies 16 bit address of the operand within instruction itself. Second & third bytes of instruction contain 16 bit. Note : In interface IO port address is only 8 bit. Examples : LDA 2000H LHLD 1111H IN 75H Direct Addressing Mode Direct Addressing Mode
- 6. The memory address where the operand located is specified by the contents of a register pair. Examples : LDAX B MOV A, M (M: H-L pair in 8085) Immediate Indirect MVI M,55H Register Indirect ADC M [A A +Cy+(M)] DCR M [(HL)(HL)+1] PUSH PSW Indirect Addressing Mode Indirect Addressing Mode
- 7. Opcode specifies the address of the operands. Examples : CMA ( A A ) STC (Cy 1) RAL DAA Implied Addressing Mode Implied Addressing Mode
- 8. NULL Addressing Mode Machine Control group Examples : EI DI NOP HLT SIM RIM Answer : NULL Addressing Mode NULL Addressing Mode