External Interrupts INT0/INT1

In this chapter, we will investigate the first pair of external interrupts. External interrupts are triggered by some stimulus applied to the pins in question. External interrupts cover INT0 and INT1, to be discussed in this chapter, and the Pin Change interrupts covered in the following chapter. The Arduino software makes INT0 and INT1 available for use, but hides the names from you. After reading this chapter, you will have a better understanding of what the Arduino is doing behind the scenes and hiding from you.