Microcontroller and Applications - May 2014

Electronics Engineering (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 the Interrupt structure of 8085 microprocessor(5 marks) 1 (b) Explain the control word format of PPI 8255(5 marks) 1 (c) Explain the interrupt structure of 8051 microcontroller(5 marks) 1 (d) Explain addressing modes of ARM processor(5 marks) 2 Design 8085 based system with following specifications
(i) CPU operating at 3 MHz
(ii) 8KB EPROM using 2KB devices
(iii) 16KB SRAM using 4KB devices
(iv) Two 8 bit ports performing simple I/O data transfer
Draw detail interface diagram and its Memory mapping & I/O mapping using absolute decoding approach.(20 marks) 3 (a) Draw the timing diagram for (i) STA 8000H (ii) IN 85H(10 marks) 3 (b) Explain with the instructions used for serial communication in 8085 microprocessor(10 marks) 4 (a) Explain with SFR used for timers and counters operation in 8051 microcontroller(10 marks) 4 (b) Explain addressing modes with one example of 8051 microcontroller(10 marks) 5 (a) Write the control word format for the I/O mode and BSR mode of the 8255(10 marks) 5 (b) List the various operating modes of 8254? Explain with waveforms mode 2&3 operations(10 marks) 6 (a) Write an assembly language program to sort a given list a of 10 numbers starting at memory location 8000H in ascending order for 8085 microprocessor(10 marks) 6 (b) Write an assembly language program to find biggest number in a block of data stored in the memory location 80H-8FH for 8051 microcontroller(10 marks)

Write a short note on

7 (a) Mapping techniques -I/O mapped I/O and memory mapped -I/O (5 marks) 7 (b) Power saving modes of 8051 microcontroller(5 marks) 7 (c) Addressing modes of ARM processor(5 marks) 7 (d) Salient features of 8051(5 marks)