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14 Time : Three hours Reg. No. : B.E./B.Tech. DEGREE EXAMINATION, APRIL/MAY 2011 Sixth Semester Electrical and Electronics Engineering EE 2354 MICROPROCESSORS AND MICROCONTROLLERS (Regulation 2008) Answer ALL questions PART A (10 2 = 20 marks) Maximum : 100 marks 1. Specify the size of data, address, memory word and memory capacity of 8085 microprocessor. 2. How is the memory segment accessed by 8086 microprocessor identified? 3. State the function of given 8085 instructions: JP, JPE, JPO, JNZ. 4. How is PUSH B instruction executed? Find the status after the execution. 5. What are the different ways to end the interrupt execution in 8259 programmable Interrupt controller? 6. What is the function of Scan section in 8279 programmable keyboard/display Controller? 7. List the alternative functions assigned to Port 3 pins of 8051 microcontroller. 8. Mention the size of DPTR and Stack Pointer in 8051 microcontroller. 9. What is the operation of the given 8051 microcontroller instructions: XRL A, direct? 10. What are the different operations performed by Boolean variable instructions of 8051? PART B (5 16 = 80 marks) 11. (a) (i) Explain the architecture, data flow and instruction execution of 8085 microprocessor. (8) (ii) Question Paper Code : With timing diagram, explain the memory read operation in 8085 microprocessor. (8) (b) (i) Show the pin configuration and function of signals of 8086 microprocessor. (8) (ii) Show the memory organization and interfacing with 8086 microprocessor. Explain how the memory is accessed. (8) 12. (a) (i) Describe the instruction format and addressing modes of 8085 microprocessor. (8)
15 (ii) Write an assembly language program based on 8085 microprocessor instruction set to search the smallest data in a set. (8) (b) (i) With suitable example, discuss about 8085 microprocessor instructions used for data manipulation. (8) (ii) Write an assembly language program based on 8085 microprocessor instruction set to find the square root of data from 1 to n using Lookup table. (8 13. (a) (i) Explain the operation of 8255 PPI Port A programmed as input and output in Mode 1 with necessary handshaking signals. (8) (b) (ii) Show and explain the ADC interfacing with 8085 microprocessor. (8) With functional block diagram, explain the operation and programming of 8251 USART in detail. (1 14. (a) Discuss about the organization of Internal RAM and Special function registers of 8051 microcontroller in detail. (16) (b) (i) Explain the Interrupt structure with the associated registers in 8051 microcontroller. (8) (ii) Explain in detail the modes of operation of Timer unit in 8051 microcontroller. (8) 15. (a) (i) Explain the Data transfer instructions and Program control instructions of 8051 microcontroller. (8) (ii) Write an assembly language program based on 8051 microcontroller instruction set to perform four arithmetic operations on 2, 8 bit data. (8 (b) (i) Explain the interfacing of Keyboard/Display with 8051 microcontroller. (8) (ii) Explain the Servomotor control using 8051 microcontroller. (8)
16 Anna University B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER Sixth Semester Electrical and Electronics Engineering EE 2354 MICROPROCESSORS AND MICROCONTROLLER (Regulation 2008) Time : Three hours Maximum : 100 marks Answer ALL questions. PART A (10 2 = 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. What are the addressing modes of 8051 microcontroller? 9. Why do we need opto-isolator circuit between microcontroller and the Stepper motor? 10. Mention the I/O instructions of 8051 microcontroller. PART B (5 16 = 80 marks) 11. (a) (i) Explain in detail the 8085 interrupt structure. (8) (ii) Draw the timing diagram for IN and OUT instruction of 8085 and explain. (8) (b) (i) Draw the internal block diagram of 8086 and explain 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 9 with one second delay between each count. At the count of 9, the counter should reset itself to 0 and repeat the sequence continuously. Assume the clock frequency is 1 MHz. (8) (ii) Write a program with a flowchart to multiply two 8-bit numbers.(8) (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) Explain the operating modes of 8255 programmable peripheral interface. (8) (ii) Draw the logical block diagram of 8279 keyboard display controller and explain. (8) (b) (i) Draw the control word of 8253 timer/counter and explain 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) Explain the program memory and data memory structure of 8051 microcontroller. (8) (ii) Draw the pin diagram of 8051 microcontroller and explain its port structure. (8) (b) (i) Draw the TMOD register format and explain the different operating modes of timer in 8051 microcontroller. (8) (ii) Explain how serial communication is performed in 8051 microcontroller. (8) Page 1
17 15. (a) (i) Explain with a program to rotate the stepper motor in both clockwise and anticlockwise direction using 8051 microcontroller. (8) (ii) How to interface a 7 segment display using 8051 microcontroller. (8) (b) (i) How 8051 is used in washing machine control? (8) (ii) How do you interface a 4 4 matrix keyboard using 8051 microcontroller? (8) Page 2
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