Microprocessor Viva Questions

SET 1 

Introduction to Microprocessor and Microcomputers

1. Define microprocessor.
2. Write application of microcontroller.
3. List the basic components of microcomputer.
4. What are the purposes of control unit in Microprocessor?
5. Mention one advantage and one disadvantage of Harvard architecture over von Neumann machine.
6. What is store programmed concept.
8086/8088 Architecture and Instruction Set
1. How many address and data bus are available in 8088 microprocessor?
2. How many minimum address lines are required to access 512 KB?
3. Explain in brief about how microprocessor works.
4. What is segment register in 8086? Explain its function.
5. With an example, explain the Register Indirect Addressing Mode.
6. Write an instruction for the direct addressing mode.
7. Identify the addressing mode of source operand in MOV AL, 23H. Give reason.
8. What happens when MUL BX instruction is executed?
9. What is the total memory capacity of the system with 20 address lines?
10. What is the result of MUL AL? Initial value of AL = 03H.
11. What happens when DIV BL executed.
12. What happens when DIV BX executed.
13. How many byte instruction is MOV AX,2304H?
14. How many byte instruction is MOV AL,23H?
15. Flag Register




OF
DF
IF
TF
SF
ZF

AF

PF

CF
16. BIU, EU, CS, DS, ES, SS, IP, AX, BX, CX, DX, SP, BP, SI, DI
17. What is opcode and operand?
18. Differentiate mov ax,2304h and mov ax,[2304h].
19. Differentiate mov ax,bx and mov ax,[bx].

SET 2
1. What are the purposes of control unit in Microprocessor?
2. Write application of microcontroller.
3. What do you mean by Interrupt vector table?
4. Write an instruction for the direct addressing mode.
5. What is the role of linker in assembly language programming?
6. Which signal is used to select Memory or I/O?
7. What are the purposes of S2, S1, S0?
8. Describe the function of 8282.
9. What are the roles of 8251 in computers?
10. How many address and data bus are available in 8088 microprocessor?
11. Explain in brief about how microprocessor works.
12. Mention one advantage and one disadvantage of Harvard architecture over von Neumann machine.
13. What is the function of a segment register in 8086?
14. What happens when the instruction TEST AL, BL is executed?
15. With an example, explain the Register Indirect Addressing Mode.
16. What is the purpose of a linker during assembly language program development?
17. What function does INT 21H perform when 0AH is loaded into AH register?
18. What is the function of the ALE signal in 8086?
19. Define maskable interrupt with an example.
20. What is the function of T pin in 8288 bus controller?

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