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MCQ | 8255 PPI (Programmable peripheral interface)

Multiple choice questions and answers (MCQ) on the 8255 programmable peripheral interface (PPI) with 4 choices, correct answer and explanation.
Submitted by Monika Sharma, on September 01, 2019

Question 1: How many pins does the 8255 PPI IC contains?

  1. 24
  2. 20
  3. 32
  4. 40

Answer: d. 40


Question 2: In which mode do all the Ports of the 8255 PPI work as Input-Output units for data transfer?

  1. BSR mode
  2. Mode 0 of I/O mode
  3. Mode 1 of I/O mode
  4. Mode 2 of I/O mode

Answer: b. Mode 0 of I/O mode


 Question 3: Which of the following pins are responsible for handling the on the Read Write control logic unit of the 8255 PPI?

  1. CS'
  2. RD'
  3. WR'
  4. ALL of the above

Answer: d. All of the above


Question 4: In which of the following modes is the 8255 PPI capable of transferring data while handshaking with the interfaced device?

  1. BSR mode
  2. Mode 0 of I/O mode
  3. Mode 1 of I/O mode
  4. Mode 2 of I/O mode

Answer: c. Mode 1 of I/O mode


Question 5: How many bits of data can be transferred between the 8255 PPI and the interfaced device at a time? or What is the size of internal bus of the 8255 PPI?

  1. 16 bits
  2. 12 bits
  3. 8 bits
  4. None of the above

Answer: c. 8 bits


Question 6: Which port of the 8255 PPI is capable of performing the handshaking function with the interfaced devices?

  1. Port A
  2. Port B
  3. Port C
  4. All of the above

Answer: c. Port C


Question 7: In which of the following modes of the 8255 PPI, only port C is taken into consideration?

  1. BSR mode
  2. Mode 0 of I/O mode
  3. Mode 1 of I/O mode
  4. Mode 2 of I/O mode

Answer: a. BSR mode


Question 8: In mode 2 of I/O mode, which of the following ports are capable of transferring the data in both the directions?

  1. Port A
  2. Port B
  3. Port C
  4. All of the above

Answer: a. Port A


Question 9: In which of the following modes we do not consider the D6, D5 and D4 bits of the control word?

  1. BSR mode
  2. Mode 0 of I/O mode
  3. Mode 1 of I/O mode
  4. Mode 2 of I/O mode

Answer: a. BSR mode


Question 10: How many data lines in total are there in the 8255 PPI IC?

  1. 8 data lines
  2. 32 data lines
  3. 24 data lines
  4. None of the above

Answer: c. 24 data lines






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