MICROPROCESSORS AND MICROCONTROLLERS-OCTOBER-2010

FOURTH SEMESTER DIPLOMA EXAMINATION IN ENGINEERING/TECHNOLOGY-OCTOBER, 2010

MICROPROCESSORS AND MICROCONTROLLERS

PART-A

(Maximum marks:15)

v  Answer the following questions in one or two sentences:

1.What is mmeaant by hardware interrupt?List any two hardware interrupt pins in 8085.

2.What is meant by instruction cycle?

3.What are the power deduction modes of 8051?

4.What is the function of TMOD register in 8051?

5.What is mean by DPTR in 8051?

6.How many location of ROM can be accessed by 8051?

7.What is meant software triggered strobe in 8253?

8.Give control word format of 8253.

9.How does analog to digital conversion is done in ADC?

10.How does a character ‘A’is displayed in seven segmentdisplay in common cathode mode?

PART-B

(Maximum marks:60)

(Answer one full question from each unit)

Unit-1

v  (a)Explain synchronous,asynchronous and interrupt driven data transfer schemes.(6)

          (b)Explain the timing diagram of I/O read operation.(6)

OR

v  (a)Describe cycle stealing and burst mode of data transfer.(6)

(b)Distinguish between maskable and non maskable interrupts.Give examples for each in 8085 microprocessor.(6)

Unit-2

v  (a)Explain the memory organization 8051 microcontroller.(6)

(b)Explain with diagram the pin configuration of 8051 microcontroller.(6)

         

OR

v  (a)Explain different modes of operation of timers/counters of 8051 microcontroller.(6)

          (b)Explain serial data transmission modes of 8051 microcontroller.(6)

UNIT-3

v  (a)Write a 8051 program to convert a hexadecimal number to BCD number.(6)

          (b)Write a 8051 program to find sum of five given numbers.(6)

OR

v  (a)Write a 8051 program to find LCM of two given numbers(6)

          (b)Write a 8051 program to find  largest among given numbers.(6)

UNIT-4

v  (a)Explain different operation modes of 8255.(6)

(b)Explain the block diagram of programmable interval timer 8253.(6)

OR

v  (a)Explain the configuration of DMA controller 8253.(6)

          (b)Explain the block diagram of programmable peripheral interface 8255.(6)

UNIT-5

v  Write a 8051 program to implement a 24 hrs real time clock.(12)

         

OR

v  How does a digitall to analog converter can be implemented?Write a 8051 program to generate a triangular wave using a DAC.(12)

        

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