Rajiv Gandhi Proudyogiki Vishwavidyalaya 2007 B.E Electronics & Tele-Communication Engineering EMR 2005 - Question Paper

RGPV Dec 2005

1. (a) discuss the operation of PPI 8255 in mode ‘1’. Draw the timing diagram for ‘in’ and ‘out’ both. 10 marks
(b)draw an interfacing circuitry for eight bit ADC to microprocessor 8086. presume the availability of PPI 8255. Indicating all the necessary signal needed. 10marks

2. (a) how will you measure the width of a pulse using timer 8253/8254? 10
(b) Draw the architecture of PIC 8259 indicating various blocks and their interconnection. discuss its operation. 10marks

3. Distinguish the subsequent :
(a) LDT and GDT of 80286 10marks
(b) Synchronous and asynchronous data transfer 5marks
(c) Static and dynamic memory 5marks

4. Explain the architecture of 16 bit processor 8086 with the help of block diagram indicating every component. How it fetches an instruction from memory in minimum mode? Draw the timing diagram for it also. 20marks

5. (a)discuss the operation of DMA controller 8257. 10marks
(b)discuss the operation of 8155 in timer mode and I/O mode. 10marks

6. (a) specify the different kind of bus standards . discuss RS232. 10marks
(b)discuss the operation of DTE 10marks

7. Describe the pin signal of 8bit microcontroller 89C51 ( a 8051 family microcontroller). 20marks

8. Write short notes on any 3 of the subsequent : 20marks
(a) Interrupts of microcontroller 8051
(b) USRAT
(c) Bit set/reset instruction of 8051
(d) Keyboard interfacing the microprocessor
(e) Assembly language and High level language programming

Earning:   Approval pending.