This document summarizes the instruction set of the 8085 microprocessor. It is classified into different types: data transfer instructions to move data, arithmetic instructions to perform operations like addition and subtraction, logical instructions for logical operations like AND and OR, branching instructions to alter program flow, and machine instructions to control the processor. Some examples of instructions are provided for each type.

1. INSTRUCTION SET OF
8085
MICROPROCESSOR
SUBMITTED BY- MAYANK BHATT
SUBMITTED TO- Ms. SHWETA SHREE

2. CONTENT:
INTRODUCTION
CLASSIFICATION OF INSTRUCTIONS
DATA TRANSFER INSTRUCTION
ARITHEMATIC INSTRUCTIONS
LOGICAL INSTRUCTIONS
BRANCHING INSTRUCTION
MACHINE INSTRUCTIONS

3. INTRODUCTION:
• The entire group of instructions that microprocessor can perform.
• These determine the functionality of the microprocessor.
• 8085 has 246 instructions.

4. CLASSIFICATION
Instruction set
of 8085
microprocessor
Data transfer
instructions
Arithmetic
instruction
Logical
instruction
Branching
instruction
Machine-
control
instruction

5. DATA TRANSFER INSTRUCTION
These instructions move data between registers, or between memory and
registers.
These instructions copy data from source to destination.
 While copying, the contents of source are not modified.
These instructions include MOV, MVI, LDA, LDAX, STA, LXI, LHLD,STAX,
XCHG
EX-MOV A,B , LDA 2034H, LDAX B, STA 2500H,

6. ARITHMETIC INSTRUCTION
These instructions perform the operations like:
Addition:
Any 8-bit number, or the contents of register, or the contents of
memory location can be added to the contents of accumulator.
The result (sum) is stored in the accumulator.
EX- ADD A,ADI 27H

7. Subtraction:
Any 8-bit number, or the contents of register, or the contents of
memory location can be subtracted from the contents of accumulator.
 The result is stored in the accumulator.
 Subtraction is performed in 2’s complement form.
 If the result is negative, it is stored in 2’s complement form.

8. Increment/Decrement:
The 8-bit contents of a register or a memory location can be
incremented or decremented by 1.
 The 16-bit contents of a register pair can also be incremented or
decremented by 1.
Increment or decrement can be performed on any register or a
memory location.

9. LOGICAL INSTRUCTION
These instructions perform logical operations on data stored in
registers, memory and status flags.
The logical operations are:
AND, OR, XOR:
Any 8-bit number, or the contents of a register, or of a memory
location can be logically ANDed, ORed, XORed with the contents of
accumulator.

10.  Compare:
Any 8-bit number , or the contents of a register , or a memory location
can be compared for equality , greater then or less then, with the
contents of accumulator.
EX-
Complement:
The contents of accumulator can be complemented.
Each 0 is replaced by 1 and each 1 is replaced by 0.

11. BRANCHING INSTRUCTION
 The branching instruction alter the normal sequential flow.
 These instructions alter either unconditionally or conditionally
 Jump:
 These instructions test for a certain condition(e.g., Zero or Carry flag)
and alter the program sequence when the condition is met.
 EX-JMP 2050H,JZ 2050H,JNZ 2050H,JC 2025H,JNC 2025H
 Call, Return and Restart:
 CALL: It changes the program sequence to the location of a subroutine. EX- CALL 2075H
 RETURN Return to the calling program after the sub routine sequence. EX- RET

12.  Machine instruction:
These instructions control machine instructions such as Halt, Interrupt
, or do nothing.
EX- HLT, NOP