ATtiny85: Introduction to Pin Change and Timer Interrupts – Embedded Thoughts
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LEAP#529
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Pin Change Interrupts on ATtiny85 – The Wandering Engineer
Evan Widloski
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ATtiny85 external and pin change interrupt tutorial - Gadgetronicx
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LEAP#529
Attiny85 – Interrupts and wdt code | Blog.onlinux.fr