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Thursday, 14 May 2015

Microcontrollers- Model question paper for B.E/B.Tech Engineering



1(a) What are the advantages and disadvantages of using a battery backup RAM? (4 Marks)
(b) What are the various issues while selecting a microcontroller having RISC philosophy? (4 Marks)
(c) Enlist the various flags in the PSW register. (6 Marks)
(d) Discuss the functions of 8051 Boolean processor. (6 Marks)
2(a) Explain how the current sinking capacity is more than the current souring capacity of an 8051 pin. What is the maximum sinking current possible for an 8051 pin without damaging it? (6 Marks)
(b) What do you mean by the term quasi-bi-directional port? Why is port 0 of 8051 true bidirectional? (4 Marks)
(c) What do you mean by the term addressing modes? What are the different addressing modes supported by 8051? (6 Marks)
(d) Explain the difference between MOVX and MOV instructions. (4 Marks)
3(a) What do you mean by the software simulation of 8051? What are the various development tools needed for testing and development of microcontroller boards. (6 Marks)
(b) If two requests of interrupt are received simultaneously, how those are handled in 8051? As a programmer, how will you take care of this while writing an 8051 program? (6 Marks)
(c) Discuss and comment on the program and data memories of 89C2051 and 89C51. (4 Marks)
(d) List the different members of Atmel flash microcontrollers. Compare their salient features. (4 Marks)
4 (a) What are the limitations in designing a frequency counter using 89C51 as far as the operating frequency is concerned? (4 Marks)
(b) What are the various possibilities of the oscillator connections in PIC microcontrollers? How are those selected? How is the frequency of oscillation decided in each of these modes? (6 Marks)
(c) Explain what is an instruction pipelining in PIC? (4 Marks)
(d) Explain what is the meaning of orthogonal instruction set. Is PIC instruction set orthogonal? (6 Marks)
5(a) What are the various functional blocks in PIC 16F877? Discuss the architectural features of PIC 16F877. In what way flash memory devices are useful in designing? (10 Marks)
(b) What is the function of WRT bit in the configuration word? How is a configuration word written? (5 Marks)
(c) State at least one application of PORTB change interrupt. How to enable this interrupt? (5 Marks)
6(a) What kind of interaction is there between CCP modules? How is it taken care of? (4 Marks)
(b) Explain how SPI bus can be used for I/O port expansion. (6 Marks)
(c) What is the difference between the functions of CREN and SREN? What happens if both are set? (6 Marks)
(d) A positive going pulse appears on pin RC2/CCP1. The clock frequency is 4 MHz. Write a PIC 16F877 program segment to measure the pulse width. (4 Marks)
7(a) Built-in PWM module in PIC microcontroller allows generating analog outputs. In this context, what is the meaning of ‘maximum 10-bit resolution’ of PWM? (6 Marks)
(b) What do you mean by the term ‘contact debounce’? How is contact debouncing problem taken care of while interfacing keyboard with a microcontroller? (6 Marks)
(c) Discuss the various selection criteria between an LCD and an LED display. (4 Marks)
(d) What do you mean by the bipolar mode of ADC? (4 Marks)
8(a) If a pneumatic actuator is to be driven by a microcontroller, what kind of interface is needed? (4 Marks)
(b) When is it preferable to have isolation between a microcontroller and rest of the circuitry? (4 Marks)
(c) Why is 8051 more suitable for number crunching applications over any RISC microcontrollers like PIC? (4 Marks)
(d) Write an 8051 program to convert signed 16-bit numbers into sign magnitude form. (8 Marks)

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