Microcontrollers and Applications - Dec 2012

Electronics & Telecomm. (Semester 5)

TOTAL MARKS: 80
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Assume data if required.
(4) Figures to the right indicate full marks. 1 (a) Explain need of demultiplexing of ADO-AD7 of 8085 microprocessor(5 marks) 1 (b) Explain difference between AJMP, SJMP, LJMP instruction of 8051 microcontroller(5 marks) 1 (c) Write Program for 8255 PPI to read data from Port C_L and transfer it to Port C_u(5 marks) 1 (d) Decribe features of ARM controller(5 marks) 2 (a) Draw and explain Timming diagram of LDA DOSOH(10 marks) 2 (b) What is difference between memory mapped I/O and I/O mapped I/O? interface 8085-8255 in I/O mapped I/O(10 marks) 3 (a) Draw and explain architecture of 8051 microcontroller (10 marks) 3 (b) Write a 8051 assembly language program to transfer message "WELCOME" serially at 9600 boud 8 bit data, 1stop bit(10 marks) 4 (a) Explain addressing modes of ARM controller with examples(10 marks) 4 (b) Write a program to generate squarewave with pulse width of 100 as using 8155. Assume clock frequency is 3 MHz(10 marks) 5 (a) Interface 16KB EPROM using 8KB chip and 8KB RAM using 4KB chip. Use absolute decoding
(b) Explain interrupt structure of 8051 microcontroller and related SFRs.(20 marks) 6 (a) Explain instruction DAA of 8085 with an example what are the contenst of Reg A after following Program executed :
6000 : MVI A, 11 H
MVI B, 22 H
LXI H, 600 C
CALL ADDs
ADI 33 H
INR A
HLT
ADDS : XTHL
ADDB
RET(10 marks) 6 (b) Explain internal structure of I/O ports of 8051 microcontroller(10 marks) 7 (a) Explain SIM and RIM instruction of 8085 microprocessor(10 marks) 7 (b) Write a program for 8051 microcontroller to count the number of 1's and number of 0's in 8 bit number(10 marks)