EC1362 MICROPROCESSOR AND MICROCONTROLLER question papers Anna university APRIL/MAY 2008 question papers Download

B.E/B.Tech DEGREE EXAMINATION APRIL/MAY 2008
Sixt Semester                           
(Regulation 2004)
Electrical and Electronice Engineering

EC1362--MICROPROCESSOR AND MICROCONTROLLER

Time: Three hours                                                    Maximum marks: 100
Answer ALL questions

PART A (10 x 2 =20 marks)

1. What is the significance of I/O ports?

2.What are the different machine cycles in 8085 Microprocessor?

3. Write the difference between opcode and operand?

4.Write the stack related instructions in 8085 Microprocessor?

5. What is the maximum number of I/O devices that can be connected to 8085 Microprocessor using 8259 ICs?

6. What is the bit set reset mode of 8255 PPI?

7. What are the different addressing modes of Microcontroller 8051?

8. Name the interrupts available Microcontroller 8051?

9. Name any four bit manipulation instructions in Microcontroller 8051?

10. How can you perform multiplication using 8051 Microcontroller?

PART B (5 x 16 = 80)

11 (a)  Draw and explain the timing diagram of the following instructions of 8085 Microprocessor,

(i) LDA 2050H

(ii) RET (16)
(or)
(b)With necessary diagrams,write short notes on the following:

 (i) RAM memory interfacing

(ii)ROM memory interfacing

(iii) Interrupt structure of 8085(16) .

12.  (a) Define addressing mode.Explain the different addressing modes of 8085 with examples . (16)
(or)
(b) Write 8085 Assembly language program to perform the following, ab+ac, where a, b and c are 8 bit binary numbers.Explain with algorithm and flowchart. (16)

13 (a)With neat block diagram,explain the architecture of 8251 USART(16)
(or)
(b)With necessary diagrams explain the interfacing of Analog to Digital converter with Microprocessor 8085(16)

14.  (a)  With functional block diagram,explain the architecture of Microcontroller 8051..(16)
(or)
(b) Explain the Timer/Counter functional unit of Microcontroller 8051 with relevant diagrams..(16)

15.  (a)Explain the 4X4 Keyboard interfacing with Microcontroller 8051(16)
(or)
(b) Explain the Microcontroller 8051 based Stepper motor control(16)

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