MICROPROCESSOR PAPER 1

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MICROPROCESSOR AND APPLICATION EC 301 5th Sem May 2k5
Note: Section A is compulsory. Attempt any Four questions from Section B and any Two questions from Section C.

Section A Marks 2 each
1.
(a) Why are the program counter and the stack pointer 16-bit registers?
(b) Explain the functions of the system controller in the 8080 A MPU.
(c) Define instruction cycle, machine cycle and T-state.
(d) What operation can be performed by using the instruction SUB A?
(e) Specify the condition to start the timer 8253.
(f) Given that the EA of a datum is 2359 and the (DS) = 490B. What is the physical address of the data?
(g) How physical address is generated in 8086?
(h) How Data acquisition and monitoring system works?
(i) Draw flow chart of the temperature controller.
(j) Draw block diagram of a typical MDS.

Section B Marks 5 each
2. What are tri-state devices and why are they essential in bus-oriented systems?

3. Load the Hexadecimal number 65H in register C, and 92H in the accumulator A. Display the number 65H at PORT0 and 92H at PORT1.

4. Write a service routine to:

(i) Read a data type.
(ii) Start conversion for the next reading.

5. Give the difference and the flag settings for SF, ZF, CF, OF and PF after
subtracting 4AE0 from each of the following:
(a) 1234
(b) 5D90
(c) 9090
(d) EA04

6. Mathematically show that an unpacked BCD product is properly adjusted by dividing the (AL) by 10 and putting the quotient in AH and the remainder in AL.

Section C Marks 10 each

7. (a) Explain the principle of operation of the IC temperature transducer.
(b) How can the various registers of the ADC/DAG timer/ counter section be accessed? 4,6

8. Draw block diagram of the level and control system. Also explain the software operation with the help of flow chart.

9. Design a microprocessor based system to monitor the line voltage and line frequency. Use a three 7-segment display to alternately display voltage and frequency.