Microprocessor 8085 interview questions and answers

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Microprocessor 8085 interview questions and answers


Here in the post Microprocessor 8085 interview questions and answers , we are posting frequently asked questions of 8085 Microprocessor in interviews, exams and viva voice. The main motive of the post Microprocessor 8085 interview questions and answers to give a brief idea of questions to interviewees and students at various levels of study.


  • Microprocessor 8085 is a  … bit processor (8 bits /16 bits)

  • Microprocessor 8085 has …… Address Lines(8/16)

  • CPU stands for  ...

  • DAA stands for  …

  • Define Interrupt

  • Define Accumulator

  • Define Address

  • Define Data Bus

  • Define Assembler

  • Define Assembly level language

  • Define Clock Cycle

  • Define Compiler

  • Define DMA

  • Explain Instruction XRI

  • Define Looping

  • Define Memory Interfacing

  • Define Object Code

  • Define Opcode

  • Define Register

  • Define RIM instruction

  • Define Subroutine

  • Define the purpose of Accumulator?

  • DMA STANDS FOR …

  • Draw block diagram of  8085 Microprocessor?

  • Explain function of ALU

  • Draw the timing diagram of opcode fetch operation

  • EPROM stands for …

  • Explain 8257  DMA controller chip  and its  functions?

  • Explain any two Arithmetic group instructions

  • Explain any two Branch Instruction

  • Explain DAA instruction of Microprocessor 8085

  • Explain DAD Instruction of Microprocessor 8085

  • Explain fetch and execute operation

  • Explain handshaking interrupts of Microprocessor 8085

  • Explain Hardware Interrupt of Microprocessor 8085

  • Explain how de-multiplexing of AD7-AD0 take place in case of Microprocessor 8085

  • Explain implicit addressing mode

  • Explain Instruction Cycle?

  • Explain Software Interrupt Used In Microprocessor 8085.

  • Explain the ADI data instruction?

  • Explain the architecture of Microprocessor 8085 with block diagram

  • Explain the concept of synchronous and asynchronous data transfer

  • Explain the conditional JUMP instruction?

  • Name any one single byte instruction of 8085 Microprocessor

  • Write various addressing modes used in Microprocessor 8085 . Explain with suitable examples?

  • Explain the data transfer instructions in case of Microprocessor 8085

  • Explain the function of Address Bus

  • Explain the functions of data transfer instruction

  • Explain the instruction CMC of Microprocessor 8085

  • Explain the instruction RAR of  8085 Microprocessor

  • Explain the LHLD address Instruction?

  • Explain the pin configuration of Microprocessor 8085

  • Explain the process of the DMA in detail

  • Explain the purpose of HLDA pin?

  • Explain the steps involved in program execution

  • Explain the various data transfer schemes used in Microprocessor 8085

  • Explain the various Registers used in Intel Microprocessor 8085

  • Explain various steps involved in the program execution

  • Explain various types of flags of 8085 Microprocessor

  • Explain with examples the addressing modes of Microprocessor 8085

  • Fetch and Execute operations

  • Give example of mask able interrupts of Microprocessor 8085

  • Give the examples of general purpose Registers?

  • How are Interrupts classified in  8085 Microprocessor

  • How many bits are needed to address 64 K memory location?

  • how many cycles the instructions MOV A,B  has?

  • how many interrupts are there in Microprocessor 8085

  • how many interrupts are there of Microprocessor 8085

  • how many lines are there in address bus of 8085 Microprocessor

  • How many machine cycles required for instruction MOV A,C

  • How much memory is addressed byMicroprocessor 8085

  • How the instructions can be classified into groups ? Explain with examples?

  • LIFO stands for …

  • Define Machine language

  • Name  Various Registers Used in 8085 ?

  • Name 16-bit Register in 8085

  • Name and Explain the function of various flags used in Microprocessor 8085

  • Name different addressing mode and Explain?

  • Name Four Addressing Modes

  • Name level triggered interrupts

  • Name the addresses made used in MOV M,Cinstruction

  • Name various data transfer schemes, Explain hand shaking schemes in details

  • Explain RIM instruction

  • Explain SIM instruction

  • Stack works on  …  principle

  • Use of counter and time delays

  • What do you mean by machine cycle

  • What do you mean by Wait state

  • What do you understand by interrupts in 8085? Explain different types of interrupts in 8085

  • What is a stack pointer

  • What is address decoding

  • What is clock frequency of 8085 Microprocessor

  • What is serial input output data transmission

  • What is T state

  • What is the direction of address bus

  • What is the length of Register of 8085

  • What is the purpose of ready signals

  • What is the status flag Register? Explain

  • What is the requirement of program counter in  8085

  • Which instruction is used to load 16 bit number

  • Which Interrupt has highest priority?

  • Which pin is used for de-multiplexing of address and data bus

  • Which Register pains are to be directly stored in the memory

  • Why it id necessary to multiplex data and address bus in  8085 Microprocessor

  • Explain fetch and execute operation .

  • Write down the difference between memory mapped I/O and I/O mapped I/O?

  • Write functions of timing and control unit along with the diagram

  • Write the functions of the address and data bus with diagram

  • Write the use of stacks and subroutines in INTEL Microprocessor 8085

  • Explain the DAD instruction?

  • Briefly describe DMA data transfer schemes?

  • Compare memory mapped and input output mapped I/O

  • Compare CALL, JMP and PUSH instruction

  • Differentiate b/w RIM &  SIM instructions

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