Q. 3. Explain the various addressing modes of 8085 with example

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Answer :
These are various technique to specify data for instruction
  • Direct addressing mode
  • Register addressing mode
  • Register addressing mode
  • Immediate addressing mode
  • Implicit addressing mode

 

  • Direct addressing mode : In this addressing mode the address of the operand is given in the instruction. Ex: STA 2000H &IN 02H 
  • Register addressing mode: In this addressing mode the operands are in the general purpose register. The opcode specify the address of the register and the operation to be Perform. Ex: MOV A,B ADD B
  • Register indirect addressing mode: 1. In this addressing mode the address of the operand is specify by a register pair. Ex: LXI H,2000H MOV A,M
  • Immediate addressing mode : 1. In this adressing mode operand is specify with in the instruction. 2. Ex: MVI A,05H // Move immediate data 05H to accumulator.
  • Implicit addressing mode : 1. This instruction operates on the content of the accumulator. 2. They don’t required operand address. 3. EX: CMA //Complement

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