Home / Engineering / Microprocessors MCQs / Page 1

Microprocessors MCQs | Page - 1

Dear candidates you will find MCQ questions of Microprocessors here. Learn these questions and prepare yourself for coming examinations and interviews. You can check the right answer of any question by clicking on any option or by clicking view answer button.

Q. 1) for i/o of 8255,if -----, the word is taken as a bit set/rest word

(A) D7=1
(B) D7=0
(C) D0=1
(D) D0=0
View Answer Discuss Share

Q. 2) on activation of ----, 8255 loads data from the input port lines into the input buffer of that port

(A) STB#
(B) IBF
(C) OBF#
(D) none of these
View Answer Discuss Share

Q. 3) 8255 has three ----parrallel port

(A) 8bit
(B) 16bit
(C) 32bit
(D) 64bit
View Answer Discuss Share

Q. 4) in ----, bidirectional data transfer is possible

(A) mode 0
(B) mode1
(C) mode2
(D) BSR
View Answer Discuss Share

Q. 5) walkie-talkie is an example of …..serial communication

(A) Simplex
(B) Half duplex
(C) Full Duplex
(D) none of these
View Answer Discuss Share

Q. 6) Transmission through telephone lines is an example of….serial commuincation

(A) Simplex
(B) Half duplex
(C) Full Duplex
(D) none of these
View Answer Discuss Share

Q. 7) Asynchronous serial communication involves

(A) start bit
(B) stop bits
(C) character data
(D) all of these
View Answer Discuss Share

Q. 8) to configure 8255 with port A output,Port B input port C lower output and port C upper input

(A) Mov al,0AFH
(B) mov al,0AEH
(C) mov Al,0CEH
(D) Mov A,0AAH
View Answer Discuss Share

Q. 9) A high on ---line indicates that the buffer register is empty

(A) TXRDY
(B) TXE
(C) TXC#
(D) both B and C
View Answer Discuss Share

Q. 10) Adc 0808 uses ----technique

(A) Successive apraximation
(B) single step
(C) dual slope
(D) flash converter
View Answer Discuss Share