Question 1

on activation of ----, 8255 loads data from the input port lines into the input buffer of that port

Accepted Answer

A) STB# 
B) IBF 
C) OBF# 
D) none of these 
A) STB# 
B) IBF 
C) OBF# 
D) none of these B

Question 2

8255 has -------- i/o pins

Accepted Answer

A) 28 
B) 26 
C) 24 
D) 22 
A) 28 
B) 26 
C) 24 
D) 22 C

Question 3

BSR mode is used to set or reset the bitsin

Accepted Answer

A) portA 
B) portB 
C) portC 
D) portD 
A) portA 
B) portB 
C) portC 
D) portD C

Question 4

ADC 0808 is ----- pin IC

Accepted Answer

A) 40 
B) 20 
C) 24 
D) 28 
A) 40 
B) 20 
C) 24 
D) 28

Question 5

8253/54 has ----independent timers/counters

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
A) 1 
B) 2 
C) 3 
D) 4

Question 6

for mode 3 of 8253/54, if the count is odd the output will be high for---

Accepted Answer

A) 2/(n+1) 
B) (n+1)/2 
C) 2/(n-1) 
D) (n-1)/2 
A) 2/(n+1) 
B) (n+1)/2 
C) 2/(n-1) 
D) (n-1)/2

Question 7

EOC means

Accepted Answer

A) End of Conversion 
B) Enable output conversion 
C) error of conversion 
D) none of these 
A) End of Conversion 
B) Enable output conversion 
C) error of conversion 
D) none of these

Question 8

ADC 0808 operates on single ---- power supply

Accepted Answer

A) 5V 
B) 10V 
C) 15V 
D) 20V 
A) 5V 
B) 10V 
C) 15V 
D) 20V

Question 9

A high on ---line indicates that the buffer register is empty

Accepted Answer

A) TXRDY 
B) TXE 
C) TXC# 
D) both B and C 
A) TXRDY 
B) TXE 
C) TXC# 
D) both B and C

Question 10

8255 has three ----parallel ports

Accepted Answer

A) 8 bit 
B) 16 bit 
C) 32 bit 
D) 64 bit 
A) 8 bit 
B) 16 bit 
C) 32 bit 
D) 64 bit

Question 11

Adc 0808 uses ----technique

Accepted Answer

A) Successive apraximation 
B) single step 
C) dual slope 
D) flash converter 
A) Successive apraximation 
B) single step 
C) dual slope 
D) flash converter

Question 12

the signals provided by ADC are

Accepted Answer

A) SOC 
B) EOC 
C) ALE 
D) all of these 
A) SOC 
B) EOC 
C) ALE 
D) all of these

Question 13

Transmission through telephone lines is an example of….serial commuincation

Accepted Answer

A) Simplex 
B) Half duplex 
C) Full Duplex 
D) none of these 
A) Simplex 
B) Half duplex 
C) Full Duplex 
D) none of these

Question 14

Asynchronous serial communication involves

Accepted Answer

A) start bit 
B) stop bits 
C) character data 
D) all of these 
A) start bit 
B) stop bits 
C) character data 
D) all of these

Question 15

8255 has three ----parrallel port

Accepted Answer

A) 8bit 
B) 16bit 
C) 32bit 
D) 64bit 
A) 8bit 
B) 16bit 
C) 32bit 
D) 64bit

Question 16

Flash ADC consist of….converters

Accepted Answer

A) 2^? 
B) 2^? -1 
C) 2^? +1 
D) none of these 
A) 2^? 
B) 2^? -1 
C) 2^? +1 
D) none of these

Question 17

8253/54 has c----command that allows the user to check the count value programmed mode and current status of the counter

Accepted Answer

A) write back 
B) write ahead 
C) read ahead 
D) read back 
A) write back 
B) write ahead 
C) read ahead 
D) read back

Question 18

In 8255 ,BSR means -----

Accepted Answer

A) bit set/reset 
B) byteset/reset 
C) binary set/reset 
D) none 
A) bit set/reset 
B) byteset/reset 
C) binary set/reset 
D) none

Question 19

to configure 8255 with port A output,Port B input port C lower output and port C upper input

Accepted Answer

A) Mov al,0AFH 
B) mov al,0AEH 
C) mov Al,0CEH 
D) Mov A,0AAH 
A) Mov al,0AFH 
B) mov al,0AEH 
C) mov Al,0CEH 
D) Mov A,0AAH

Question 20

for i/o of 8255,if -----, the word is taken as a bit set/rest word

Accepted Answer

A) D7=1 
B) D7=0 
C) D0=1 
D) D0=0 
A) D7=1 
B) D7=0 
C) D0=1 
D) D0=0

on activation of ----, 8255 loads data from the input port lines into the input buffer of that port

8255 has -------- i/o pins

BSR mode is used to set or reset the bitsin

ADC 0808 is ----- pin IC

8253/54 has ----independent timers/counters

for mode 3 of 8253/54, if the count is odd the output will be high for---

EOC means

ADC 0808 operates on single ---- power supply

A high on ---line indicates that the buffer register is empty

8255 has three ----parallel ports

Adc 0808 uses ----technique

the signals provided by ADC are

Transmission through telephone lines is an example of….serial commuincation

Asynchronous serial communication involves

8255 has three ----parrallel port

Flash ADC consist of….converters

8253/54 has c----command that allows the user to check the count value programmed mode and current status of the counter

In 8255 ,BSR means -----

to configure 8255 with port A output,Port B input port C lower output and port C upper input

for i/o of 8255,if -----, the word is taken as a bit set/rest word

I/O Mode and Communication in 8255 and ADCS

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Exam 1: I/O, Communication, and Timerscounters of 8255 and ADC 0808

on activation of ----, 8255 loads data from the input port lines into the input buffer of that port

8255 has -------- i/o pins

BSR mode is used to set or reset the bitsin

ADC 0808 is ----- pin IC

8253/54 has ----independent timers/counters

for mode 3 of 8253/54, if the count is odd the output will be high for---

EOC means

ADC 0808 operates on single ---- power supply

A high on ---line indicates that the buffer register is empty

8255 has three ----parallel ports

Adc 0808 uses ----technique

the signals provided by ADC are

Transmission through telephone lines is an example of….serial commuincation

Asynchronous serial communication involves

8255 has three ----parrallel port

Flash ADC consist of….converters

8253/54 has c----command that allows the user to check the count value programmed mode and current status of the counter

In 8255 ,BSR means -----

to configure 8255 with port A output,Port B input port C lower output and port C upper input

for i/o of 8255,if -----, the word is taken as a bit set/rest word

I/O Mode and Communication in 8255 and ADCS

Filters