Mumbai University Previous year question papers
V Sem Electronics Examination Dec 2007
Microprocessor and Microcontroller
Question No.1 is compulsory.
Attempt any four questions from the remaining six questions.
Assume suitable data if necessary for justification.
Figures to the right indicate full marks.
Answers to questions should be grouped and written together.
Use legible handwriting.
Explain the power saving modes of 8051 microcontroller.
Design the following components for 8086 microprocessor with following specifications:
(i) 64 kb operating software memory using 27128 chip
(ii) 64 kb RAMas data memory using 6264 chip
(iii) 2, 8 bit I/o ports. .
2. Design 8751 based system with following specifications:
(a) CPU clock 12 MHz
(b) 32 kb program memory using 2764 chip
.(c) 32 kb data memory using 62256 chip
(d) 2, 8 bit I/o ports using 8255
(e) One 8 bit DACfor analog o/p
(f) One 8 bit ADC to read analog i/p.
3. (a) Write a assembly language program to generate a square wave of 1 KHz at P1.0 (bit 0 at port 1).
(b) Explain the following instructions:
(i) MOVX, A,
(ii) CJNE A, # OFFH, NEXT
(iii) ANL 32 H, # 32H
(iv) MUL AB
(v) JBC P1.0, NEXT
4. Explain 8086-8087 interfacing with neat diagram. Explain the synchronization between 8086 &8087.
(a) Convert -187.625 in short real format.
(b) Explain the following directive with example
6.Write short notes on any three:
(a) RS-232C bus standard
(b) Interrupt structure of 8051
(c) Interrupt structure of 8086
(d) Serial port of 8051
(e) Data types in 8087.
(a) What are hand-shaking signals? Explain the need for hand-shaking signals.
Explain the various modes of the 8255 PPI with hand-shaking signals.
(b) Explain the string instructions of 8086 microprocessor with short example. 10