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NATIONAL OPEN UNIVERSITY OF NIGERIA

UNIVERSITY VILLAGE, PLOT 91, CASDASTRAL ZONE, NNAMDI AZIKIWE EXPRESS WAY, JABI, ABUJA.
FACULTY OF SCIENCES
SEPTEMBER 2020 EXAMINATION

COURSE CODE: CIT 411
COURSE TITLE: MICROCOMPUTERS AND MICROPROCESSORS
CREDIT: 2 Units
TIME ALLOWED: 2 Hours
INSTRUCTION: Answer Question ONE (1) and any other THREE (3) Questions.


Question 1
1a. Distinguish between microprocessorand microcontroller. (4 marks)
1b. Draw the Architecture of Von Neumann microcomputer and describe its components (7 marks)
1c. Discuss four (4) technological innovations of microprocessors (4 marks)
1d. Identify (6) important features of 8085 microprocessor (3 marks)
1e. Examine the Accumulator of 8085 microprocessor (2 marks)
1f. Predict the actions performed by the following microprocessors instructions: (5 marks)
SN INSTRUCTION PREDICTION
i MOV R1, #0A8h
ii POP 9h
iii SUBB A,@5h
iv ORL A,05h
v DIV BC
(Total = 25 marks)


Question 2
2a. Compare x64 with x86micro processor (5marks)
2b.Assume that x86 microprocessors’ Registers R1,R2 and R3 has the values 0FFh, 0FEh and0EDh respectively. Calculate the results of the following operations: (5 marks)
SN OPERATION RESULT
i ADD R1, #1
ii INC R3
Iii PUSH R1
Iv DEC R2
v. SUB R2, #12c. What is a coprocessor? (2 marks)
2d. Examine the fields in the coprocessor instruction.(3 marks)
(Total = 15 marks)


Question 3
3a. Describe coprocessor trap?(3 marks)
3b. Examine the functions of (i).Control Unit (ii). Arithmetic Logic Unit in 8085 Microprocessor (4 marks)
3c. Identify six(6) electronic components that could be connected to a microprocessor(3 marks)
3d. Arrange the actions executed by the microcontroller when an Interrupt Occurs.(5 marks)
(Total = 15 marks)


Question 4
4a. Identifyfour (4) components of microprocessorinterface (2 marks)
4b. Describethe Immediate addressing mode in 8085 microprocessor. (2 marks)
4c.Compare the hardware Characteristics of Reduced Instruction Set Computer (RISC) with Complex Instruction Set Computer (CISC). (6 marks)
4d. How could microprocessors be applied in Digital Signal Processing (5marks)
(Total = 15 marks)


Question 5
5a. Describe an interrupt (2 marks)
5b.List the Major features of Superscalar Microprocessor (The PowerPC 601). (2 marks)
5c. Differentiate between Dual-core and Quad-core processors.(5 marks)
5d. Examine the functions oftheFlag components in 8085 microprocessors(6 marks)
(Total = 15 marks)


Question 6
6a. Describeassembly language?(2 marks)
6b. Criticize the use of low-level language in program development. (4 marks)
6c. Write down and analyze the format of assembly language instruction(8 marks)
(Total = 15 marks)


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