Some basic Questions to Build Your Concepts

Build your concepts 

1. List the components of a computer

2. Explain the function of each component of a computer.

3. What is a Microprocessor? What is the difference between a Microprocessor & CPU?

4. Define bit, byte, word, double word, quad word and instruction

5. What determines that Microprocessor is an 8, 16 or 32 bit?

6. Explain the difference between the machine language and the assembly language of the 8085 microprocessor.

7. What is an assembler?

8. What are low and high level languages?

9. What are the advantages of an assembly language in comparison with high level

languages?

10. List the four operations commonly performed by the MPU.

11. Specify the four control signals commonly used by the 8085 MPU.

12. Specify the function of the address bus and the direction of the information flow on the address bus.

13. Why is the data bus bidirectional?

14. What is a bus?

15. How many memory locations can be addressed by a microprocessor with 14 address lines?

16. How many address lines are necessary to address two megabytes (2048K) of

memory?

17. Why is the data bus bidirectional?

18. Specify the control signal and the direction of the data flow on the data bus in a

memory-write operation.

19. What is the function of the accumulator?

20. What is a flag?

21. Why are the program counter and the stack pointer 16-bit registers?

22. What is the function of the WR signal on the memory chip?

23. Specify the number of registers and memory cells in a 128 x 4 memory chip.

24. What is the memory word size required in an 8085 system? 25. While executing a program, when the 8085 MPU completes the fetching of the

machine code located at the memory address 2057H, what is the content of the

program counter?

26. What is the role of clock in Microprocessor?

27. What is the difference between INR & INX instructions?

28. List all the interrupt signals of 8085 microprocessor.

29. Write short note on evolution of microprocessors.

30. Explain the functions of the ALE and IO/M signals of the 8085 microprocessor.

31. List the sequence of events that occurs when the 8085 MPU reads from memory.

32. If the 8085 adds 87H and 79H, specify the contents of the accumulator and the status of the S, Z, and CY flags.

33. If the clock frequency is 5 MHz, how much time is required to execute an instruction  Of18 T-states?

34. Discuss the programming model of 8085 µP with the help of suitable diagram.

35. Draw and explain the timing diagram for opcode fetch operation

36. Discuss various types of addressing modes of 8085.

37. Explain why the number of output ports in the peripheral-mapped I/O is restricted to 256 ports.

38. In the peripheral-mapped I/O, can an input port and an output port have the same port  address? Explain.

39. What are the control signals necessary in the memory-mapped I/O?

40. List the four categories of 8085 instructions that manipulate data.

41. Define opcode and operand, and specify the opcode and the operand in the instruction

MOV H, L.

42. Write logical steps to add the following two Hex numbers. Both the numbers should  be saved for future use. Save the sum in the accumulator. Numbers:

A2H and 18H.

43. (a)Specify the contents of the registers and the flag status as the following

instructions are executed.

i. MVI A, 00H

ii. MVI B, F8H

iii. MOV C, A

iv. MOV D, B

 v. HLT

 (b)Write instructions to load the hexadecimal number 65H in register C and 92H in accumulator A. Display the number 65H at PORT0 and 92H at PORT1.

44. Draw and explain the block diagram of a microprocessor 8085.

45. (a)Why the lower order address bus is multiplexed with data bus? How they will be de-multiplexed?

(b) Differentiate between maskable and non-maskable interrupts.

46. Write an 8085 assembly language program using minimum number of instructions to

add the 16 bit no. in BC, DE & HL. Store the 16 bit result in DE pair. 47. (a)Explain in detail the following instructions:-

(i) ADC (ii) LHLD (iii) RLC (iv) DI

 (b) Define & explain the term addressing modes.

Microprocessor system peripheral and interface

68. What is interfacing?

69. Explain the concept of Direct Memory Access (DMA).

70. Explain the functions of Handshake signals.

72. List the operating modes of the 8155A programmable device.

73. Write a note on any of the applications of microprocessors.