MICROPROCESSORS AND MICROCONTROLLERS-MARCH-2009

FOURTH SEMESTER DIPLOMA EXAMINATION IN ENGINEERING/TECHNOLOGY-MARCH, 2009

MICROPROCESSORS AND MICROCONTROLLERS

PART-A

(Maximum marks:15)

v  Answer the following questions in one or two sentences:

1.What are the different flags of 8085 PSW?

2.What is the function of program counter in 8085?

3.Why external pull is up needed for Port 0 of 8051?

4.What is the function of EA of 8051?

5.What happens when MOVX a,@DPTR is executed?

6.Write an 8051 assembly instruction to interchange nibbles of register A.

7.State the port status of 8255 in mode 0 operation.

8.State the function of 8257.

9.What is the function of RTC chip?

10.Write the directive to create a look up table starting at code memory 0510H with values 32h,FFh and 6Dh.

PART-B

(Maximum marks:60)

(Answer one full question from each unit)

Unit-1

v  (a)Draw the pin diagram of 8085.(6)

          (b)Explain the functions of each pin.(6)

OR

v  (a)Draw the timing diagram of memory write cycles.(6)

(b)Distinguish between I/O mapped I/O and memory mapped I/O of 8085.(6)

Unit-2

v  (a)Explain the different  addressing modes of 8051 with examples.(8)

(b)Explain the two special function registers used for configuring interrupt in 8051.(4)

         

OR

v  (a)Draw the block diagram of 8051.(8)

          (b)What is the function of DPTR?Explain any two 8051 instructions using DPTR.(4)

UNIT-3

v  (a)Write a program to get Hex data in the range 00 to FFfrom port-1 and convert it to decimal.Save digits in R7,R6 and R5 where the least significant digit is R7.(4)

          (b)Write a program for 8051 to transfer message ‘YES’serially at 9600 baud rate,8 bit,1 stop bit continuously.Assume crystal=11.0592 Mhz.(8)

OR

v  (a)Write a program in which the 8051 gets data from serial port is send to P0 Assume the crystal=11.0592 MHz,set the baud rate at 9600.(6)

          (b)Write an 8051 assembly program to add the unsigned numbers found in RAM locations 25h,26h and 27h together and store the result in 31h(for MSB)and 30h(for LSB)(6)

UNIT-4

v  (a)Explain the two set command word of 8259.(6)

(b)Exploain the pin details of 8279.(6)

OR

v  (a)Draw the connection diagram of 8259 with microprocessor system.(6)

          (b)Explain the pin diagram of 8253.(6)

UNIT-5

v  (a)Draw the schematic diagram for interfacing 3 digit 7 segment display to 8051.(6)

          (b)Write an assembly program to display 1 2  3 on the seven segment display.(6)

OR

v  (a)Draw the schematic diagram for implementing 3 x 4 matrix keyboard with 8051.(6)

(b)Write an assembly program to read the key board to register RO.(6)

        

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