8085 Addressing Modes

Definition of 8085 Addressing Mode

8085 Addressing Mode is the technique/ method to specify the operand/data for an instruction. The Operand may be in Register, Memory address or in Instruction itself.

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The different Addressing modes of 8085 microprocessor are:

1. Immediate Addressing Mode:
• The data/Operand is specified in the instruction itself.
• For example:
•  MVI A, 08H
• ADI 20H
• LXI H, C006H 
2. Register Addressing Mode:
• The Operand/data are present in the General purpose programmable register and register are specified in an instruction.
• For example:
• MOV A,B
• ADD B
• ANA C
• CMP B
• INR D
3. Direct Addressing Mode:
• The operand/data are specified in Memory address .
• For example:
• LDA 2000H   
• STA 2000H   
• IN 10H
• LXI H 2080H
4. Register Indirect Addressing Mode:
• The address of the operand is specified by the memory pointer.
• The register pair which contains the address of the data is specified in the instruction.
• For Example:
• LDAX B  
• STAX D   
• MOV M, A   
• MOV B, M 
5. Implied Addressing Mode
• The operand or data is specified by the opcode itself.
• For Example:
• RAL
• CMA
• NOP
• HLT

So , these are the 5 Addressing modes in 8085 Microprocessor.

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• 8085 Microprocessor Features, Pin Diagram, Architecture
• 8086 Microprocessor Features, Architecture
• All 8085 Instructions with Operand, Size, Addressing Mode, Machine Cycle, T-States
• Timing Diagram [8085 Microprocessor]