Microprocessors solved MCQs

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for i/o of 8255,if -----, the word is taken as a bit set/rest word for i/o of 8255,if -----, the word is taken as a bit set/rest word D7=1 D7=0 D0=1 D0=0 discuss The answer is: B. D7=0
on activation of ----, 8255 loads data from the input port lines into the input buffer of that port on activation of ----, 8255 loads data from the input port lines into the input buffer of that port STB# IBF OBF# none of these discuss The answer is: B. IBF
8255 has three ----parrallel port 8255 has three ----parrallel port 8bit 16bit 32bit 64bit discuss The answer is: A. 8bit
in ----, bidirectional data transfer is possible in ----, bidirectional data transfer is possible mode 0 mode1 mode2 BSR discuss The answer is: C. mode2
walkie-talkie is an example of …..serial communication walkie-talkie is an example of …..serial communication Simplex Half duplex Full Duplex none of these discuss The answer is: B. Half duplex
Transmission through telephone lines is an example of….serial commuincation Transmission through telephone lines is an example of….serial commuincation Simplex Half duplex Full Duplex none of these discuss The answer is: C. Full Duplex
Asynchronous serial communication involves Asynchronous serial communication involves start bit stop bits character data all of these discuss The answer is: D. all of these
to configure 8255 with port A output,Port B input port C lower output and port C upper input 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 discuss The answer is: B. mov al,0AEH
A high on ---line indicates that the buffer register is empty A high on ---line indicates that the buffer register is empty TXRDY TXE TXC# both B and C discuss The answer is: B. TXE
Adc 0808 uses ----technique Adc 0808 uses ----technique Successive apraximation single step dual slope flash converter discuss The answer is: A. Successive apraximation
the signals provided by ADC are the signals provided by ADC are SOC EOC ALE all of these discuss The answer is: D. all of these
Flash ADC consist of….converters Flash ADC consist of….converters 2^n 2^n -1 2^n +1 none of these discuss The answer is: B. 2^n -1
8253/54 has ----independent timers/counters 8253/54 has ----independent timers/counters 1 2 3 4 discuss The answer is: C. 3
8253/54 timers can be programmed in---modes 8253/54 timers can be programmed in---modes 1 3 6 5 discuss The answer is: C. 6
in mode 0 of 8253/54 ----disables counting in mode 0 of 8253/54 ----disables counting gate=1 gate=0 wr#=1 wr#=0 discuss The answer is: B. gate=0
8253/54 has c----command that allows the user to check the count value programmed mode and current status of the counter 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 discuss The answer is: D. read back
for mode 3 of 8253/54, if the count is odd the output will be high for--- 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 discuss The answer is: B. (n+1)/2
EOC means EOC means End of Conversion Enable output conversion error of conversion one of these discuss The answer is: A. End of Conversion
ADC 0808 is ----- pin IC ADC 0808 is ----- pin IC 40 20 24 24 discuss The answer is: D. 24
ADC 0808 operates on single ---- power supply ADC 0808 operates on single ---- power supply 5V 10V 15V 20V discuss The answer is: A. 5V

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