LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

FG 29

M.Sc. DEGREE EXAMINATION – PHYSICS

SECOND SEMESTER – APRIL 2008

PH 2807 – MICROPROCESSORS AND MICRO CONTROLLERS

 

 

 

Date : 17/04/2008            Dept. No.                                        Max. : 100 Marks

Time : 1:00 – 4:00

PART – A

Answer ALL Questions.                                                                                            (10×2=20)

1. Write a note on the LDS instruction of m
2. Write a note on ‘W’ and ‘D’ bits in the instructions of m
3. Develop a program segment for mP8086 to complement the contents of memory location with offset 100h with respect to ES.
4. Develop a program for mP8086 to unpack a two digit packed BCD number in AL to unpacked BCD format in AX.
5. Develop a program for mP8086 to accept 20H bytes from an input port with address FFFFH and to store them in a byte array called ARY. Use string primitives.
6. Develop a program segment to set the trap flag of m
7. Develop a program segment for µP8086 to fill a word array ARY with 5005H.
8. With suitable examples explain the LOOP and JCXZ instructions of µP8086.
9. Write a note on the default stack of the microcontroller m
10. Develop a program for mC8051 to multiply 05H and 1AH and to store the result in the internal RAM at an address 10H.

PART – B

Answer any FOUR.                                                                                                   (4×7.5=30)

11. With an example for each, explain the various conditional branch instructions in m
12. Develop an ASM86 program to convert a two digit packed BCD number in memory to binary format and store it in memory.
13. Develop an ASM program for mP8086 to find the number of lowercase alphabets in a byte array.
14. With a block diagram discuss bus buffering and latching in mP8086 operated in minimum mode.
15. Develop a program for mC8051 to add the contents of R0 of bank 0 and R3 of bank 1 and to store the sum in R7 of bank 3 using register mode of addressing.

PART – C

Answer any FOUR.                                                                                                   (4×12.5=50)

16. With three examples each, explain the modes of addressing of data in m
17. DPX and DPY are 32-bit and 16 bit signed numbers. Develop an ASM program for mP8086 to find the product and store the result at DPZ.
18. Develop an ASM program for 8086 to solve, , by defining a procedure for cube. Use register relative mode of addressing for data.
19. Write a note on the DMA controller. With a neat diagram explain the events which take place during DMA transfer using BUS stealing. (4+8.5)
20. With a neat block diagram of the internal architecture of mC8051, explain the role and functioning of the various modules.

 

 

 

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