Tribhuvan University
Bachelor of Science in Computer Science and Information Technology
Semester 2 · TU Board 2080
Course Title: Microprocessor (CSC167)
Full Marks: 60Pass Marks: 24Time: 3 hours
Candidates are required to give their answers in their own words as far as practicable. The figures in the margin indicate full marks.
Group A
Attempt any two questions.(2 × 10 = 20)
- 1.10
Explain instruction cycle, machine cycle and T-states. Draw timing diagram of fetch and execute of LDA instruction with brief description.
Answer comingAlso asked in 2082, 2080, 2079, 2078, 2075
- 2.10
Draw a well-labeled block diagram of 8086 microprocessor. Explain its Register organization.
Answer comingAlso asked in 2080, 2076, 2075
- 3.10
Explain the working of LHLD and DAA instruction of 8085. An array containing 5 elements is stored from memory location 4000h to 4000h; write an assembly language program for 8085 microprocessor to find largest element of array and store in memory location 4005h.
Group B
Attempt any eight questions.(8 × 5 = 40)
- 4.5
What is ALE? Explain the role of ALE in address/data bus De-multiplexing in 8085 with suitable diagram.
- 5.5
What do you mean by Isolated I/O? Explain basic DMA operation in brief.
Answer comingAlso asked in 2082
- 6.5
What is flag? Explain all the flags present in 8085 microprocessor.
Answer comingAlso asked in 2082, 2076
- 7.5
Write an assembly language program for 16 bit microprocessor to count and display number of occurrence of letter 'o' in string "Microprocessor organization".
- 8.5
What is Descriptor? Explain the use of descriptor in logical to physical address conversion in 80286 microprocessor.
Answer comingAlso asked in 2081
- 9.5
What is mean by addressing mode? Explain different addressing modes in 8085 microprocessor.
Answer comingAlso asked in 2081, 2079, 2078, 2076, 2075
- 10.5
What are various functional units of 80386 microprocessor? Explain function of each unit.
- 11.5
What are different modes of parallel I/O? Differentiate between synchronous serial communication and asynchronous serial communication.
- 12.5
Write short notes on:
a) RS-232
b) Interrupts
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