AU Solved Paper - 7

AU Solved Paper

May-2014

Microprocessors & Microcontrollers

Semester - VI (EEE)

Time: Three Hours]

[Maximum Marks: 100

Answer ALL Questions

PART A (10 × 2 = 20 Marks)

Q.1 To obtain a 320 ns clock, what should be the input clock frequency? What is the frequency of clock signal at CLK OUT ? (Refer Two Marks Q.14 of Chapter - 1)

Q.2 What is meant by level-triggered interrupt? Which of the interrupts in 8085 are level triggered? (Refer section 4.2.2.1)

Q.3 Mention the similarity and difference between compare and subtract instructions. (Refer Example 2.6.2)

Q.4 State the purpose and importance of NOP instruction.  (Refer Two Marks Q.30 of Chapter - 2)

Q.5 What are the salient features of INTEL 8259 programmable interrupt controller? (Refer section 9.2)

Q.6 How data is transmitted in asynchronous serial communication? (Refer Two Marks Q.7 of Chapter - 11)

Q.7 Mention the purpose of  in 8051 microcontroller. (Refer Two Marks Q.14, 15 of Chapter - 14)

Q.8 List the interrupt sources in 8051 microcontroller. (Refer Two Marks Q.6 of Chapter - 16)

Q.9 State the functions performed by JBC and CJNE instructions in 8051 microcontroller. (Refer section 15.8.2)

Q.10 What is program status word? (Refer Two Marks Q.6 of Chapter 14)

PART - B (5 × 16 = 80 Marks)

Q.11 a) Explain how pipelined architecture is implemented in 8086. (Topic not included in new syllabus (course 2013))

OR

b) Draw the signal configuration of 8085 and explain the purpose of each signals. (Refer section 1.3)

Q.12 a) i) Describe the interrupt structure of 8085 microprocessor and compare the same with 8086 microprocessor. (Refer section 4.2) [10]

OR

b) Write an assembly language program with its output to add two 16 bit numbers using 8085. (Refer Lab expt. 2.5.5) [16]

Q.13 a) Explain the 8255 PPI architecture with different modes by neat sketch. (Refer sections 8.3 and 8.4) [16]

OR

b) With neat diagram, explain the architecture and features of 8279 keyboard/display Na in controller. (Refer sections 12.3 and 12.5) [16]

Q.14 a) Discuss about the Timers in 8051 with suitable examples. (Refer section 16.3) [16]

OR

b) Discuss the addressing modes of 8051 microcontroller with suitable examples. (Refer section 15.1) [16]

Q.15 a) Write an 8051 C program that continuously gets a single bit of data from P1.7 and sends it to P1.0, while simultaneously creating a square wave of 200 μs period on on pin P2.5. Use timer 0 to create the square wave. Assume that XTAL = 11.0592 MHz. (Refer Example 16.6.10) [16]

OR

b) A switch is connected to pin P2.7. Write a ALP to monitor the status of SW and perform the following.

i) If SW = 0, the stepper motor moves clockwise

ii) If SW = 1, the stepper motor moves counter clockwise. (Refer Example 17.4.3) [16]