Question

What is the use of pin change interrupts?

(a) To change pins during interrupts

(b) To use more pins for interrupts

(c) To disable pin usage during interrupts

(d) To enable pin usage during interrupts

The question was posed to me during a job interview.

The origin of the question is Interrupt Service Routine in portion Arduino Programming of Arduino

Answer 1

Correct answer is (b) To use more pins for interrupts

For explanation: Pin change Interrupts can be used to enable the Arduino to use more than one pin during the interrupt service routine. In ATMega 168 or 328 based Arduino boards, upto 20 pins can be dedicated to interrupts.