MCQs on AVR microcontroller, 8255, 8051 – NPTEL assignment

Last updated on March 10th, 2022 at 05:35 pm

11 ) Find the control word of the 8255 for resetting BIT 7 of Port C.

a) 00001111
b) 10001111
c) 00001110
d) 10001110

Accepted Answers:
00001110

12 ) To get 6 displayed by a 7 Segment display, what should be the combination of 8051 pins (P1.7 – P1.0)?

a) 01111101
b) 10111110
c) 01111111
d) 01100000

Accepted Answers:
01111101

13 ) Which of the following is the correct combination to select Port A in an 8255 chip?

a) CS = 0, A1 = 0, A0 = 0
b) CS = 0, A1 = 0, A0 = 1
c) CS = 0, A1 = 1, A0 = 0
d) CS = 1, A1 = 0, A0 = 0

Accepted Answers:
CS = 0, A1 = 0, A0 = 0

14) With respect to ADC 0804, find out which of the following statement(s) are false.
1. CS is active high pin.
2. D7-D0 are output pins.
3. The Chip has a voltage range of 0 – 5 V.

a) Option 1.
b) Option 2.
c) Option 3.
d) All the options.

Accepted Answers:
Option 1.