Visvesvaraya Technological University (VTU) 2006 B.E Electrical and Electronics Engineering 7th SEM /E MICRO CONTROLLER AND APPLIACATIONS - Question Paper
Seventh Semester B.E. Degree Examination, May / June 2006 Eiectronics & Communication
Microcontrollers and Applications
Time: 3 hrs.] [Max_ Marks: 100
Note: Answer any FIVE full questions.
1 a. Bring out the architectural differences between a Microprocessor and a
c. Differentiate bervveen the following instructions of 8051 microcontroller. i\ SWAP and XCHG ii. MOVX and MOVC
2 a_ Why microcontroller has different'addressing modes? Explain the different addressing
b. Explain the timing diagram of external .memory cy.cleof 8051 microcontroller.
c. Explain the significance of SCON register. How is it used to control serial data transmission? (O'Marksi
3 a. Explain the organization of Internal RAM of 8051. iCTMarki*
b. Explain the significance of Processor Status Word. Briefly discuss PSW regisier of S051. ' i06Mark5>
c. Write a lookup table using the DPTR as the base, to convert the BCD digits into 7 Segment code. ' (OTMarks)
4 a. What are the different ranges associated with JUMP and CALL instructions of 8051
b. What are external Interrupts? How external interrupts are handled in 8051 ? How level triggered interrupts are reset? Set INTI interrupt as edge triggered. (OTMarks)
c. Write a program in which every 2 seconds, the LED connected to P2.7 is turned ON and OFF four times, while at the same time the 8051 is getting data from PI and sending it to P0 continuously. Make sure the ON and OFF states are 50 ms in duration.
5 a. Discuss the need for stack memory in microcontrollers. How stack is operated in
8051? What is the default location of stack? How programmer can modify it?
b. Find the value of TH1 if the timer 1 is used in timer mode 2 to generate a baud rate of 4800. Assume appropriate oscillator frequency. (06Marksi
Find the address of first two internal RAM locations between 20H and 60H which contain consecutive numbers. If so. set the carry flag to 1 else clear the carry flag.
(07Marks)
.An overrun is said to occur in data reception whenever a new byte of data is received before previously received byte has been read. Discuss two methods by which overrun might be detected by 8051. Write a suitable program for the purpose. (07Marks)
Design an Interfacing circuit to connect a memory of capacity 8K by 8-bit to 8051.
(05Marks)
Interface a 4 x 4 matrix keyboard to 8051. Write the required block schematic and the assembly level program. (OSMarks)
WTiat are the different methods of parameter passing from calling routine to subroutine? Explain with example. (07Marks)
Interface 8255 to the micro controller. Use the controller to read the 8-bit A/D converter(0804). Use I/O mapped l'O technique. Write the required ALP for the purpose. (OSMarks)
Write the Hardware required to demultiplex the address bus of 8051. (05Marks)
Write an ALP for 8051, to receive bytes of DATA serially, and pul them in PI. Set the baud rate at 4S00. 8-bit data, and 1 stop bit. (06Marks)
Design an Interface circuit to connect a 4-Seven segment multiplexed display to 8051. Use memory' mapped memory technique. (OSMarks)
Write an ALP to convert a-2-digit Hex number into its equal BCD number. (06Marks)
|
Attachment: |
| Earning: Approval pending. |
