nithyalakshmi


{ City } vellore
< Country > india
* Profession * thimiri
User No # 8063
Total Questions Posted # 0
Total Answers Posted # 4

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Questions / { nithyalakshmi }
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Answers / { nithyalakshmi }

Question { Wipro, 11031 }

For asynchronous transmission, is it necessary to supply
some synchronizing pulses additionally or to supply or to
supply start and stop bit?


Answer

asynchronous transmission does not required any
syncronizing pulses , instead it needs start and stop bit
to acknowledge the first and last bit of the data which is
transmitted.these bits can be high or low.
In some advanced controllers which has in built UART ,
provide option to select no. of start and stop bits in the
transmission.

Is This Answer Correct ?    30 Yes 1 No

Question { Wipro, 33812 }

which type of architecture 8085 has?
what major and minor differnce of 8086&8085


Answer

8085 is Vonneumann architecture in which data and code is
shared in the by the same memory .
8085 is 16 x 8 bit processor where 8086 is 20 x 16 bit
processor .

Is This Answer Correct ?    19 Yes 2 No


Question { 13708 }

why usb port communication is popular than parallel
port,when serial ports are slower than parallel


Answer

To reduce complexcity in data transmission ,
for long distance communication.
Universal Serial Bus has only 4 data lines for
communication ie. datain,dataout,Vcc,Gnd.where pararllel
port has 25 lines which is more complex .

Is This Answer Correct ?    5 Yes 3 No

Question { Siemens, 19708 }

In the field of microprocessor what is DMA?why it is used?


Answer

DMA-Direct Memory Access.It means microprocessor can access
datas present in the external memory (can be
ROM,DRAM,EEPROM,etc) without CPU.

Is This Answer Correct ?    24 Yes 7 No