CSIT 2nd Semester
Microprocessor Board Question Paper 2082

CSC 167-2082 ✡
Tribhuvan University
Institute of Science and Technology
2082
✡
Bachelor Level/First Year/Second Semester/Science
Computer Science Information Technology (CSC 167)
(Microprocessor)
(New Course)
Full Marks:60 Pass Marks:24 Time:3 hours

Candidates are required to give their answers in their own words as for as practicable.
The figures in the margin indicate full marks

Section A
Long Answer Questions
Attempt any Two question.
[2x10=20]
1.

Explain instruction cycle, machine cycle and T-states. Draw timing diagram of instruction cycle of STA instruction with brief description.

2.

Draw block diagram of 8086 microprocessor and explain its main two functional units. Differentiate between Real Address Mode and Protected Virtual address mode of 80286 microprocessor.

3.

Explain the working of PUSH and POP instruction with suitable example. Write an assembly language program using 8085 microprocessor instructions to divide 34h by 08h, store the remainder in memory location 8050h and quotient in memory location 8051h.

Section B

Attempt any Eight questions

[8x5=40]
4.

Differentiate between Isolated mapped and Memory Mapped I/O. Explain basic DMA operation in brief.

5.

What is flag? Explain all the flags available in 8085 microprocessor.

6.

Write an assembly language program for 8086 microprocessor to convert the string "microprocessor is programmable" to uppercase.

7.

What is the use of AD7-AD0 in 8085 microprocessor? Explain address de-multiplexing process in 8085 microprocessor with suitable diagram.

8.

What is interrupt? Explain 8259 interrupt controller in brief with suitable diagram.

9.

Explain Register Organization in 80386 microprocessor.

10.

Draw a logic diagram showing generation of memory and I/O read/write control signals in 8085 microprocessor.

11.

What is Descriptor? How logical address is converted to physical address using Descriptor table with suitable diagram.

12.

Write short notes on:
a)Operating Modes of 8255 PPI
b) Harvard Architecture