Interfacing with 8255 MCQ’s

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This set of Microcontroller Multiple Choice Questions & Answers (MCQs) focuses on “Interfacing with 8255″.

1. Which pins of a microcontroller are directly connected with 8255?
a) RD
b) WR
c) D0-D7
d) All of the mentioned

2. Find the control word for PA= out, PB= in, PCL=out, PCH=out (Mode0)?
a) 0x02H
b) 0x82H
c) 0x83H
d) 0x03H

3. The 8255 is a ______ chip.
a) Input/Output
b) Analog to Digital
c) Digital to analog
d) None of the mentioned

4. Which pins are used to select the ports and the control register?
a) CS
b) A1
c) A0
d) All of the mentioned

5. Why MOVX instruction is being used to access the ports of the 8255?
a) because 8255 is connecting a microcontroller in memory mapped I/O configuration
b) because 8255 is used to access the external communication
c) because 8255 is used to access the data transfer
d) because 8255 is used to access the interfacing of LCD, motor etc

6. How many pins of the 8255 can be used as the I/O ports?
a) 8
b) 16
c) 24
d) 32

7. What is the value of the control register when RESET button is set to zero?
a) 0x00H
b) 0xFFH
c) 0x11H
d) value remains the same

8. What is correct about the BSR mode from below?
a) In BSR mode, only the individual bits of PORT A can be programmed
b) In BSR mode, only the individual bits of PORT B can be programmed
c) In BSR mode, only the individual bits of PORT C can be programmed
d) none of the mentioned

9. 8255 is a ____ pin IC.
a) 16
b) 8
c) 40
d) 60

10. The 8255 can be programmed in any of the __________
a) 2 modes
b) 3 modes
c) 4 modes
d) 5 modes

11. 8255 has handshaking capability?
a) yes
b) no
c) cant be said
d) depends on the conditions

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