Interrupts! You use them to detect the change in pin status, timers, communication and so on. I’m sure if you reached this post in need of using interrupts (or having trouble with interrupts), then I assume you know what interrupts are and what you are trying to use. With XC8, using interrupts is programmatically simple, since most of the code layout is given to you by <xc.h>. Now setting up interrupts is as simple as using the keyword “interrupt” before the function which should be called when an interrupt happens. I am not going to cover the difference between C18 and XC8 (XC8 makes your life a lot easier), but I’ll show you how to use interrupts in XC8. This post will have only the input from pin change. The timer interrupt will be covered later in the timer chapter. I encourage you to read the datasheet in order to understand much better about interrupt registers. Make sure the IO pin you are going to use for interrupt actually has interrupt feature. Because I have see...
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