To perform operations with a microprocessor, instructions must specify the operation, data sources, and result destination. The Intel 8085 uses several addressing modes including direct addressing, register addressing, register indirect addressing, immediate addressing, and implicit addressing. Direct addressing specifies the operand address in the instruction itself. Register addressing uses register pairs to specify operands. Immediate addressing embeds the operand in the instruction. Implicit addressing operates on the accumulator without an explicit operand address.

3.  To perform any operation , we have to give the
corresponding instruction to the microprocessor`
 In each instruction , programmer has to specify 3 things ;
 Operation to be performed
 Address of sources of data
 Address of destination of result

4.  Each instruction requires certain data on which it has to
operate.
 Intel 8085 uses the following addressing modes
 Direct Addressing
 Register Addressing
 Register Indirect Addressing
 Immediate Addressing
 Implicit Addressing

5. Direct Addressing
 The address of the operand (data) is given to the
instruction itself .
 Example
 STA 2400H

6. Register Addressing
 The Operand is in one of the general purpose register or
accumulator
 Op code specifies the address of the register
 Ex
 MOV A,B
78

7. Register Indirect Addressing
 Operand specified by a register pair
 EX
 LXIH,2500H

8. Immediate Addressing
 The operand specified within the instruction itself
 Ex
 MVI A,05

9. Implicit Addressing
 These are certain instructions which operate on the content
of the accumulator.
 Such instructions do not require the address of the operand
 Ex
 CMR,RAL,RAR

10. Thank you