Anna University Chennai 2011-6th Sem B.E Electrical and Electronics Engineering MICROPROCESSORS AND MICROCONTROLLER / (EEE) - Question Paper

B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2011.
Sixth Semester
Electrical and Electronics Engineering
EE 2354 — MICROPROCESSORS AND MICROCONTROLLER
(Regulation 2008)
Time : 3 hours Maximum : 100 marks
ans ALL ques..
PART A — (10 × two = 20 marks)

1. Draw the schematic of latching low-order address bus in 8085 microprocessor.
2. If the stack segment register contains 3000h and stack pointer register contains 8434h, what is the physical address of the top of the stack in 8086 microprocessor?
3. Why do we need look-up table?
4. How are the 8085 instructions classified according to the functional categories?
5. Draw the Mode Word format of 8251 USART.
6. State the use of ISR and PR registers in 8259 PIC.
7. List the on-chip peripherals of 8051 microcontroller.
8. elaborate the addressing modes of 8051 microcontroller?
9. Why do we need opto-isolator circuit ranging from microcontroller and the Stepper motor?
10. Mention the I/O instructions of 8051 microcontroller.

PART B — (5 × 16 = 80 marks)

11. (a) (i) discuss in detail the 8085 interrupt structure. (8)
(ii) Draw the timing diagram for IN and OUT instruction of 8085 and discuss. (8)
Or
(b) (i) Draw the internal block diagram of 8086 and discuss the bus interface unit and execution unit. (8)
(ii) How address decoding is done in memory Interface. (8)

12. (a) (i) Write a program to count from 0 to nine with 1 2nd delay ranging from every count. At the count of 9, the counter should reset itself to 0 and repeat the sequence continuously. presume the clock frequency is one MHz. (8)
(ii) Write a program with a flowchart to multiply 2 8-bit numbers.(8)
Or



(b) (i) Compare the similarities and differences of CALL and RET instructions with PUSH and POP instructions. (8)
(ii) Sixteen bytes are stored in memory locations at XX50h to XX5Fh. Transfer the entire block of data to new memory locations starting at XX70h. (8)

13. (a) (i) discuss the operating modes of 8255 programmable peripheral interface. (8)
(ii) Draw the logical block diagram of 8279 keyboard display controller and discuss. (8)
Or
(b) (i) Draw the control word of 8253 timer/counter and discuss the operating modes of 8253 timer/counter. (8)
(ii) Why do we need A/D converter and D/A converter? Draw the block diagram to interface 8085 microprocessor with A/D convertor and D/A convertor. (8)

14. (a) (i) discuss the program memory and data memory structure of 8051 microcontroller. (8)
(ii) Draw the pin diagram of 8051 microcontroller and discuss its port structure. (8)
Or
(b) (i) Draw the TMOD register format and discuss the various operating modes of timer in 8051 microcontroller. (8)
(ii) discuss how serial communication is performed in 8051 microcontroller. (8)

15. (a) (i) discuss with a program to rotate the stepper motor in both clockwise and anticlockwise direction using 8051 microcontroller. (8)
(ii) How to interface a seven segment display using 8051 microcontroller. (8)
Or
(b) (i) How 8051 is used in washing machine control? (8)
(ii) How do you interface a four × four matrix keyboard using 8051 microcontroller? (8)

Earning:   Approval pending.