MICROPROCESSORS AND MICROCONTROLLERS-MARCH-2008

FOURTH SEMESTER DIPLOMA EXAMINATION IN ENGINEERING/TECHNOLOGY-MARCH, 2008

MICROPROCESSORS AND MICROCONTROLLERS

PART-A

(Maximum marks:15)

v  Answer the following questions in one or two sentences:

1.How is AD7 to AD0 demultiplexed in 8085?

2.What happens when READY pin of 8085 is activated?

3.Write the bit address of bit 1 of RAM location 20h.

4.What is the vector address of INTO interrupt of 8051?

5.Write an 8051 assembly instruction to copy the content of address in R0 to A register.

6.What happens when DJNZ R0,radar is executed?

7.State the function of 8253.

8.Brief the function of CTS pin of 8251?

9.What is the function of RTC chip?

10.Write the directive to create a look up table starting at location 0800h with values ‘HELLO’.

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 I/O read.(6)

(b)Explain the Registers of 8085.(6)

Unit-2

v  (a)Explain the internal RAM organization of 8051(6)

(b)Describe the bits of the following registers:

(i)SMOD      (ii) PCON(6)

         

OR

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

          (b)Describe the bits of the following registers:

               (i)TMOD           (ii)TCON     (4)

UNIT-3

v  (a)rite a program in which the 8051 gets data from p2 and stores in data memory 20h.continuously while incoming data from the serial port is send to P0.Assume the crystal=11.0592 MHZ,set the baud rate at 9600 .(8)

          (b)Write a program to add two 16 bit numbers 2DF2H 3CE7H anfd 5D9AH                                                     3B8DH.Place the sum in R7,and R6.R6 should be the lower byte.(4)

OR

v  (a)Write a program to get Hex data in the range 00 to FF from 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 “GOOD DAY”serially at 9600 baud rate,8 bit,1 stop bit continuously.Assume crystal=11.0592MHz.(8)

UNIT-4

v  (a)Draw the block diagram of 8279.(6)

(b)Draw the pin diagram of 8257.(6)

OR

v  (a)Draw the block diagram of 8257.(6)

          (b)Explain the control word of 8255.(6)

UNIT-5

v  (a)Draw the circuit diagram for interfacing an 8 bit DAC to 8051..(6)

          (b)Write an assembly code for DAC.(6)

OR

v  (a)Draw the circuit diagram for traffic lightcontroller using 8051.(6)

(b)Write an assembly code for the traffic light controller.(6)

        

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