CS1304 – MICROPROCESSORS AND MICROCONTROLLERS Question Papers

B.E/B.TECH.DEGREE EXAM, MAY/JUNE 2007. Fifth Sem
Computer Science and Engineering
CS1304 – MICROPROCESSORS AND MICROCONTROLLERS
(Regulation 2004)

Time: Three hours Maximum: 100 marks
Answer ALL questions
PART A – (10 ´ 2 = 20 marks)
1. How address and data lines are demultiplexed in 8085?
2. What is the function performed by SIM instruction in 8085?
3. What is pipelined architecture?
4. How the interrupts can be masked/unmasked in 8086?
5. What are the signals involved in memory bank selection in 8086
micro processor?
6. How clock signal is generated n 8086? What is the maximum internal clock
frequency of 8086?
7. What is the function of gate signal in 8254 timer?
8. Write the format of KW1 in 8259.
9. List the interrupts of 8051 micro controller.
10. What are register banks in 8051 microcontroller?

PART B – (5 ´ 16 = 80 marks)
11. (a) (i) Explain the various logical and arithmetic instructions available in 8085 microprocessor. (10)
(ii) Explain the function of various flags of 8085 microprocessor (6)

Or

(b) (i) Differentiate between I/O mapped I/O and memory mapped I/O. (6)
(ii) Write an 8085 assembly language program to convert 8 bit binary to ASCII code. (10)

12. (a) (i) Describe the action taken by 8086 when INTR pin is activated. (6)
(ii) Write an assembly language program in 8086j to search the largest data in an array. (10)

Or

(b) (i) Discuss the various addressing modes of 80896 microprocessor. (10)
(ii) Explain the following assembler directives used in 8086
(1) ASSUME
(2) EQU
(3) DW (8)

13. (a) (i) Explain in detail about memory access mechanism in 8086 (8)
(ii) Explain the function of following 8086 signals.
(1) HLDA
(2) RQ/GTO
(3) DEN
(4) ALE. (8)

Or

(b) (i) Draw and explain a block diagram showing 8086 in maximum mode configuration. (12)
(ii) What are the advantages of the multiprocessor systems? (4)

14. (a) (i) With the help of block diagram explain the operation of USART (8251A) (10)
(ii) Discuss the salient features of 8259 – programmable interrupt controller. (6)

Or

(b) (i) Describe the various modes of operations in 8253 programmable intervalTimer. (8)
(ii) Explain the operation of DMA controller (8237).

15. (a) With a suitable block diagram, explain the architecture of 8051 microcontroller. (16)

Or

(b) Discuss in detail about 8051 based stepper motor control along with necessary hardware and software. (16)

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