Microprocessor And Interfacing Technique Set 1

Computer Science Engineering (CSE)

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This set of Microprocessor and Interfacing Technique Multiple Choice Questions & Answers (MCQs) focuses on Microprocessor And Interfacing Technique Set 1

Q1 | for i/o of 8255,if -----, the word is taken as a bit set/rest word
  • d7=1
  • d7=0
  • d0=1
  • d0=0
Answer: d7=0
Q2 | on activation of ----, 8255 loads data from the input port lines into the input buffer of that port
  • stb#
  • ibf
  • obf#
  • none of these
Answer: ibf
Q3 | 8255 has three ----parrallel port
  • 8bit
  • 16bit
  • 32bit
  • 64bit
Answer: 8bit
Q4 | in ----, bidirectional data transfer is possible
  • mode 0
  • mode1
  • mode2
  • bsr
Answer: mode2
Q5 | walkie-talkie is an example of …..serial communication
  • simplex
  • half duplex
  • full duplex
  • none of these
Answer: half duplex
Q6 | Transmission through telephone lines is an example of….serial commuincation
  • simplex
  • half duplex
  • full duplex
  • none of these
Answer: full duplex
Q7 | Asynchronous serial communication involves
  • start bit
  • stop bits
  • character data
  • all of these
Answer: all of these
Q8 | to configure 8255 with port A output,Port B input port C lower output and port C upper input
  • mov al,0afh
  • mov al,0aeh
  • mov al,0ceh
  • mov a,0aah
Answer: mov al,0aeh
Q9 | A high on ---line indicates that the buffer register is empty
  • txrdy
  • txe
  • txc#
  • both b and c
Answer: txe
Q10 | Adc 0808 uses ----technique
  • successive apraximation
  • single step
  • dual slope
  • flash converter
Answer: successive apraximation
Q11 | the signals provided by ADC are
  • soc
  • eoc
  • ale
  • all of these
Answer: all of these
Q12 | Flash ADC consist of….converters
  • 2^n
  • 2^n -1
  • 2^n +1
  • none of these
Answer: 2^n -1
Q13 | 8253/54 has ----independent timers/counters
  • 1
  • 2
  • 3
  • 4
Answer: 3
Q14 | 8253/54 timers can be programmed in---modes
  • 1
  • 3
  • 6
  • 5
Answer: 6
Q15 | in mode 0 of 8253/54 ----disables counting
  • gate=1
  • gate=0
  • wr#=1
  • wr#=0
Answer: gate=0
Q16 | 8253/54 has c----command that allows the user to check the count value programmed mode and current status of the counter
  • write back
  • write ahead
  • read ahead
  • read back
Answer: read back
Q17 | for mode 3 of 8253/54, if the count is odd the output will be high for---
  • 2/(n+1)
  • (n+1)/2
  • 2/(n-1)
  • (n-1)/2
Answer: (n+1)/2
Q18 | EOC means
  • end of conversion
  • enable output conversion
  • error of conversion
  • none of these
Answer: end of conversion
Q19 | ADC 0808 is ----- pin IC
  • 40
  • 20
  • 24
  • 28
Answer: 28
Q20 | ADC 0808 operates on single ---- power supply
  • 5v
  • 10v
  • 15v
  • 20v
Answer: 5v
Q21 | 8255 has -------- i/o pins
  • 28
  • 26
  • 24
  • 22
Answer: 24
Q22 | 8255 has three ----parallel ports
  • 8 bit
  • 16 bit
  • 32 bit
  • 64 bit
Answer: 8 bit
Q23 | In 8255 ,BSR means -----
  • bit set/reset
  • byteset/reset
  • binary set/reset
  • none
Answer: bit set/reset
Q24 | BSR mode is used to set or reset the bitsin
  • porta
  • portb
  • portc
  • portd
Answer: portc
Q25 | 8255 has ----i/o modes
  • 2
  • 3
  • 4
  • 8
Answer: 3
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