A very well-written tutorial:
http://www.hobbyprojects.com/pic_tut...utorial11.html
...The PIC has 4 sources of interrupt. They can be split into two groups. Two are sources of interrupts that can be applied externally to the PIC, while the other two are internal processes. We are going to explain the two external ones here.
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And a step-by-step tutorial with code examples from Nuts & Volts:
http://www.precision.net.in/picbasic/PIC_INT.PDF
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