Microcontroller and Applications - Dec 2011

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 register architecture of ARM processor?(5 marks) 1 (b) Write a program in 8085 to convert a 8 bit ninary number stored at 1000H into equivalent gary number. Store the gray number at the same location(5 marks) 1 (c) Explain hardware connection for accessing external code memory using 8051(5 marks) 1 (d) Explain following assembler directives of ASM51
(i) DBIT (ii) DS (iii) Extrn (iv) public (v) ORG(5 marks) 2 (a) Interface 8155 with 8085 in simple I/O mode. Generate triangular waveform using DAC 0808. the output voltage should swing between 0-5V(10 marks) 2 (b) Explain interrupt structure of 8085 and interrupt related instructions(10 marks) 3 (a) Write a program in 8085 to generate a square wave of 100 Hz frequency on the SOD pin . Assume 1 Mhz operating frequency(10 marks) 3 (b) Explain block diagram of 8155 with control word format and data transfer between 8085 and 8155 in handshaking mode(10 marks) 4 (a) Explain block diagram of 8255 with BSR and I/O modes to interface it with 8085(10 marks) 4 (b) Explain timing diagram of memory read/ write and I/O read/ write cycles of 8085(10 marks) 5 (a) Explain how 8051 interrupt structure allows single step execution also explain implementation of single step operation(10 marks) 5 (b) Explain following pins and instruction of 8051
1. EA 2. PSEN 3. SWAP 4. DAA 5. SUBB(10 marks) 6 (a) Explain addressing modes of 8051 with examples(10 marks) 6 (b) Explain different Timer modes of operations for 8051(10 marks) 7 (a) Explain generation of control signals for 8085 microprocessor(5 marks) 7 (b) Explain the flag register (PSW) of 8051 (5 marks) 7 (c) Design 8031 based an instrusion warning using interrupts that sounds a 400 Hz tone for 1 second (using a loudspeaker connected to P1.7) whenever a door sensor connected to (INTO bar) makes a high to low transition.(10 marks)