Shivaji University 2005 B.E Computer Science MicroProcessor-1 - Question Paper

Y-509
SECOND YEAR OF COMPUTER SCIENCE AND ENGINEERING (PART-2) EXAMINATION, 2005
SHIVAJI UNIVERSITY, KOLHAPUR
MICROPROCESSOR-1

Day and Date: Friday, 27-05-2006 Total Marks: 100
Time: 10.00a.m. To 1.00p.m.

Instructions: 1) Q.1 from section-1 and Q.5 from section-2 are compulsory.

2) Solve any 2 ques. from Q.2, Q.3, and Q.4

3) Solve any 2 ques. from Q.6, Q.7, and Q.8

SECTION-1

Q.1 a)State whether true/false. Justify (any five)[Marks 10=2*5]

1) POP D is data transfer of instruction.

2) ALE signal is needed because higher order bus is multiplexed with data in 8085.

3) 'Opcode FetCh ’machine cycle is of 4t states for all instructions.

4) RST 4.5 pin causes microprocessor 8085 to go in to ‘WAIT’ state.

5) If register H=OOH, L=OIH, then by using DCX h instruction will set zero flag.

6) RST5 is a direct addressing mode kind instruction.

b)Accumulator A contains 11H. What flags will be affected by executing subsequent program excerpt?[Marks 4]

MVI B, 2BH
CMP B
HLT

c) discuss the function of READY signal of 8085 with timing diagram.[Marks 6]



Q.2 a) Draw a timing diagram to interface a 4K ROM and a 2K RAM consecutively with microprocessor 8085, starting with ROM interfacing at address 0000 H. discuss.[Marks 9]

b) Draw timing diagrams of

1) ANA B

2) MOV M, A

[Marks 6]

Q.3 a) Draw a diagram to interface two thumbwheel switches to 8085 using 8255.Write a program to initialize 8255 in this case with port numbers from 20 H to 23 H. [Marks 9]

b) State addressing modes of the subsequent modes with instruction with justification:[Marks 6]

1) CMP B

2) JZ address

3) LDAX D



Q.4 a) discuss the memory mapped I/O mode used in 8085. [Marks 6]

b) discuss the execution of the subsequent instruction in every machine cycle.[Marks 9]

8085 H CC 9700 H



SECTION-2


Q.5 Solve any five:[Marks 20=5*4]

1) With the help of SIM instruction format, write the instruction to mask RST 5.5.

2) List 5 interrupt inputs of 8085 with priority..

3) discuss keyboard part of 8279.

4) discuss mode 0 of 8253.

5) discuss bidirectional mode of 8253.

6) What is BSR mode? Write a program to set D5 bit of port C



Q.6 a) Specify handshaking signals and their functions if port A of 8255 is set-up as out-put port in mode 1.[Marks 8]

b) discuss mode 0 and mode one of 8253.[Mark7]



Q.7 a) with the help of 8279 block diagram explains display part of 8279. [Marks 8]

b) Interface ADC 0809 to the microprocessor with 8255 .Select input channel two for conversion.[Marks 7]



Q.8 a) Explains in detail synchronous transmission and synchronous receptors.[Marks 8]


b) With the help of block diagram discuss successive approximation. [Marks 7]

Earning:   Approval pending.