Microcontrollers and Applications - May 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) With the help of a diagram explain the architecture of 8055 microprocessor (8 marks) 1 (b) Write an Assembly language program to multiply two 8 bit numbers for execution an 8085 processor(4 marks) 1 (c) Write an assembly level program to enable all interrupts of 8051 and set their priority to low(4 marks) 1 (d) Describe any four features of ARM processor(4 marks) 2 (a) Explain interrupt structure of 8085 with a neat diagram(10 marks) 2 (b) With suitable diagrams explain handshake mode of 8155(10 marks) 3 (a) Describe addressing modes of ARM processor(10 marks) 3 (b) Explain the internal structure of Port 1 and Port 3 of 8051(10 marks) 4 Design a 8085 based microprocessor system with the following specifications : CPU of 6 MHz, EPROM of 8KB using 4KB chips, RAM of 8KB using 4KB chips, one 8255 PPI at address 20 H and one 8279 at address 30h. Discuss the curcuit and show the memory and I/O map(20 marks) 5 (a) Explain ICWs and OCWs of 8259 PIC (10 marks) 5 (b) Write a program to convert hexadecimal number to BCD number without using DAA instruction(10 marks) 6 (a) Discuss relative merits and demerits of various data transfer techniques(6 marks) 6 (b) Write a program to transmit a byte using SOD pin(8 marks) 6 (c) Write a program to generate a 1KHz frequency square wave using 825(6 marks)

Write short notes (any four) :-

7 (a) Serial communication in 8051(5 marks) 7 (b) Memory related instructions of Arm microcontroller(5 marks) 7 (c) 8251 USART(5 marks) 7 (d) Reentrant and recursive subroutines(5 marks) 7 (e) 8085 flags and their usage(5 marks)