Microprocessors and Peripherals - May 2012

Electronics Engineering (Semester 4)

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 addressing modes of 8085 microprocessor with example.(10 marks) 1 (b) What is segmented memory? State the advantages of it w.r.t 8086 microprocessor.(10 marks) 2 (a) What is meant by DMA? Show interfacing of 8237/57 with 8086 and explain.(10 marks) 2 (b) Explain the following instructions with one example each: (i) SAL (ii) TEST (iii) STOS (iv) CMP (v) JC(10 marks) 3 (a) Explain the operation of IC 8259 with block diagram.(10 marks) 3 (b) Write an assembly language program for 8086 to exchange the blocks of 1KB located at 0100H and 0200H using String Instructions.(10 marks) 4 (a) Explain Assembler Directives of 8086.(10 marks) 4 (b) What are the various modes of operation of 8255 PPI?(10 marks) 5 (a) Explain addressing modes of 8085 microprocessor(10 marks) 5 (b) Draw the Timing diagrams and explain for:
(i) Memory read in minimum mode.
(ii) Memory write in maximum mode.(10 marks) 6 (a) Explain interrupts of 8086 in detail.(10 marks) 6 (b) (i) Explain generation of address bus and data bus.(5 marks) 6 (b) (ii) Differentiate between memory mapped I/O and I/O mapped I/O.(5 marks)

Write short notes on any three:-

7 (a) RS 232 serial Interface Standard.(7 marks) 7 (b) Memory Banking in 8086.(7 marks) 7 (c) 8284 Clock Generator.(7 marks) 7 (d) 8288 Bus Controller.(7 marks)