PCINT interrupts on Arduino - ElectroSoftCloud
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Gammon Forum : Electronics : Microprocessors : Interrupts
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Pin Change Interrupts on ATtiny85 – The Wandering Engineer
Bare Metal Micro
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Smiley's Workshop 8: Interrupts, I/O Registers, and the Butterfly Joystick | Nuts & Volts Magazine
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ATtiny85 external and pin change interrupt tutorial - Gadgetronicx
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ATtiny85: Introduction to Pin Change and Timer Interrupts – Embedded Thoughts
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