Jawaharlal Nehru Technological University Kakinada 2010-1st Sem B.E Computer Science and Engineering Code No.V3128 R07 III B.TechRegular s emr, MICROPROCESSORS AND INTERFACING (Common for CSE,

Code No.V3128 R07
III B.Tech I Semester Regular exams November, 2010
MICROPROCESSORS AND INTERFACING
(Common for CSE, IT, ECC & ICE)
Time: three hours Max.Marks: 80
ans any 5 ques.
All ques. carry equal marks
*****
1. discuss various addressing modes of 8086 microprocessors with suitable examples. [16]

2. a) Write an ALP in 8086 for the addition of a series of 8-bit numbers.
b) Write an ALP in 8086 to move a string of data words from offset 2000H to offset 3000H and the length of the string in 0FH. [8+8]

3. a) What is DMA? discuss the need for DMA.
b) discuss the interfacing of 8257 with 8086 microprocessor. [8+8]

4. Interface ADC 0808 with 8086 using 8255 ports. Use port A of 8255 for transferring digital data output of ADC to the CPU and port C for control signals. presume that an analog input is current at I/P2 of the ADC and a clock input of suitable frequency in available for ADC. Draw the schematic and write needed ALP. [16]

5. What is interrupt service routine? Draw the interrupt vector table and discuss various interrupts available in 8086. [16]

6. a) discuss various modes data transmission.
b) Draw and discuss the internal architecture of 8251 USART. [8+8]

7. a) What is meant by paging? discuss its advantages and disadvantages.
b) discuss the procedure of converting linear address into physical address. [8+8]

8. a) explain the advantages of microcontroller based systems over microprocessor based systems.
b) Draw and explain the formats and bit definitions of the subsequent SFRs
i). PCON, ii). TCON and iii). TMOD [4+12]

Earning:   Approval pending.