Pin Change Interrupts - Difference in PORT Read & DigitalRead - Programming Questions - Arduino Forum
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ATtiny85: Introduction to Pin Change and Timer Interrupts – Embedded Thoughts
Gammon Forum : Electronics : Microprocessors : Interrupts
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ATtiny2313 Alternate Pin Functions | Internal Peripherals
Change default D8 input pin of Input Capture Unit program for AVR Atm 328? - Programming Questions - Arduino Forum
Arduino pin change interruptions ISR Tutorial
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Smiley's Workshop 8: Interrupts, I/O Registers, and the Butterfly Joystick | Nuts & Volts Magazine
AVR Microcontroller with Core Independent Peripherals and PicoPower technology
