Cochin University of Science and Techology (CUST) 2008 B.Tech Electronics and Communications Engineering MICROPROCESSORS - Question Paper
Microprocessors
BTS (C)IV- OS - 012 - M
B. Tech Degree IV Semester Examination, April 2008
CS/EB/EC/EI402 MICROPROCESSORS (2006 Scheme)
Time: 3 Hours Maximum Marks: 10
PART-A (Answer ALL questions)
(All questions carry EQUAL marks)
(8x5*40)
I- (a) Explain the function of ALE pin present in the 8085 microprocessor. I
(b) Explain in detail about the flag structure of8085. V
(c) Differentiate between CALL and JMP instruction.
(d) Write an ALP to multiply a given number by 10 *
(e) Explain the five vectored interrupts of 8085.
(f) What is stack pointer? What is die relevance of stock pointer in connection with subprograms.
(g) Differentiate between synchronous and asynchronous transmission.
(h) Explain briefly about DMA operation. ' *
PART - B
(All questions cany EQUAL marks) j,
(4x15*60)
II. With the help of neat diagrams, explain the internal architecture of 8085 microprocessor. f *
OR i
III. Explain the function of the following pins present in 8085 microprocessor: %
(i) HOLD (ii) HLDA (iii) READY f
(iv) SID (v) SOD
>
A
I
IV. Explain various addressing modes of 8085.
OR
V. With relevant examples, explain the function of subroutines. Write a subroutine to generate a delay of 1 sec. Explain the instructions used.
VI. Draw and explain the timing diagram of the instruction LDA 8000. , J
OR
VII. Draw and explain the timing diagram of the instruction STA 8000.
$
VIII. Draw the block diagram of 8255 and explain. }
OR
IX. Explain the different modes of operation of 8254.
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