BPUT MCA Micro-processor question paper 2013

Total number of printed pages — 2 MCA
MCC102

First Semester Examination — 2013
MICRO-PROCESSOR AND ASSEMBLY LANGUAGE PROGRAMMING
QUESTION CODE : C- 625 Full Marks -70
Time: 3 Hours

Answer Question No.1 which is compulsory and any five from the rest.

The Figure in the right hand margin indicate marks.

Q1. Answer the following questions: 2*10

(a) Decode the following ASCII message. 10100111010100101010110001001011001 01000001001000100000110100101000100

(b) What is the purpose of Flip-Flop ?

(c) What is the role of memory. ? Classify the memories.

(d) Discuss the significance of flag register employed by different microprocessor

(f) If a typical PC uses a 20-bit address code, how much memory can the CPU address ?

(g) What is a Tri-state device ?

(h) What will be the contents of PC after the execution of RST 6 instruction ?

(i) What will the status of CY flag after execution of CMP L instruction ?

(j) What is DMA data transfer ?

2. (a) Convert the following Octal numbers directly to Hexadecimal numbers without converting to decimal numbers :
i.5525    ii. 777    iii. 234    iv. 120    v.316 5

(b) Determine the output frequency for a frequency division circuit that contains 12 flip-flops with an input clock frequency of 20.48 MHz. 5

3.(a) Explain the addressing mode of 8085 giving one example for each mode.5

(b) What is the use of segment registers ? Explain how the physical address is obtained using segment registers. 5

4. Explain the data related and branch related addressing modes of 8086 (using schematic diagram) in detail. 10

5. (a) Write an assembly language program to multiply the contents of memory location 2040H with 2041H 5

(b) Tabulate differences between I/O mapped I/O and memory mapped I/O.5

6. (a) Write an 8085 based assembly language program to arrange a series of numbers in descending order. 5

(b) Write a detailed note on 8259A programmable interrupt interface. 5

7 (a) Draw the block diagram of a CRT controller and explain its working. Also explain how it can be interfaced to 8085 processor. 5

(b) Draw the timing diagram fo! MV! A, 8CH instruction and explain the operation of the processor T sate by T state. 5

8. Write short notes on any two of the following : 5*2


(a) Demultiplexer
(b) Interrupts
(c) Machine Cycle
(d) USART.






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