FOURTH SEMESTER DIPLOMA EXAMINATION IN ENGINEERING/TECHNOLOGY-MARCH, 2010
MICROPROCESSORS AND MICROCONTROLLERS
PART-A
(Maximum marks:15)
v Answer the following questions in one or two sentences:
1.What is meant by burst mode in DMA data transfer modes?
2.What is the function of program counter?
3.What are microcontrollers?
4.What is meant by PSW in 8051?
5.What is the difference in CJNE and DJNZ instructions in 8051?
6.Which instruction is used for external data transfer in 8051?What are the registers that can be used with this instruction?
7.What is meant by hardware triggered stroke mode in 8253?
8.What is the function of TXRDY signal in 8251?
9.How does a time interval of 0.05 seconds can be obtained using 8051 timer?
10.How does a character ‘C’is displayed in seven segment display in common cathode mode?
PART-B
(Maximum marks:60)
(Answer one full question from each unit)
Unit-1
v (a)Explain the interrupts supported by 8085 microprocessor.(6)
(b)Explain the timing diagram of I/O read operation.(6)
OR
v (a)Explain DMA data transfer with neat block diagram.(6)
(b)Explain the architecture of 8085 microprocessor with neat diagram.(6)
Unit-2
v (a)Explain different addressing modes of 8051 microcontrollers(6)
(b)explain the interrupts in 8051.(6)
OR
v (a)Explain different modes of operation of timers/counters in 8051.(6)
(b)Explain the memory organization of 8051 microcontroller.(6)
UNIT-3
v (a)Write a 8051 program to find square root of a given number.(6)
(b)Write a 8051 program to find GCD of two given numbers.(6)
OR
v (a)Write a 8051 program to find LCM of two given numbers.(6)
(b)Write a 8051 program to sort given number in ascending order.(6)
UNIT-4
v (a)Explain the command words of interrupt controller-8259.(6)
(b)Explain the operation modes of programmable peripheral interface 8255.(6)
OR
v (a)Explain modes of operation of 8279.(6)
(b)Explain the block diagram of programmable communication interface 8251.(6)
UNIT-5
v (a)How does a seven segment display can be interfaced with 8051 microcontroller?Write a 8051 program to display ‘CA 78’ continuously on seven segment display.(12)
OR
v Explain how does a stepper motor can be interfaced with 8051.Write a 8051 program to rotate the stepper motor continuously in clockwise direction.(12)
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