Top 80+ Solved Microprocessor and Interfacing Technique MCQ Questions Answer
Q. 8253/54 has c----command that allows the user to check the count value programmed mode and current status of the counter
a. write back
b. write ahead
c. read ahead
d. read back
Q. for mode 3 of 8253/54, if the count is odd the output will be high for---
a. 2/(n+1)
b. (n+1)/2
c. 2/(n-1)
d. (n-1)/2
Q. EOC means
a. end of conversion
b. enable output conversion
c. error of conversion
d. none of these
Q. A high on ----pin causes all 24 lines of three 8 bit ports to be in the input mode
a. wr\
b. reset
c. gnd
d. vcc
Q. For i/o mode of 8255,if -----,the word is taken as a mode definition word
a. d7=1
b. d7=0
c. d0=1
d. d0=0
Q. For i/o mode of 8255 ,if -----, the word is taken as a bit set/reset word
a. d7=1
b. d7=0
c. d0=1
d. d0=0
Q. 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