# Mysterious behavior of ATTiny85 and hardware interrupts

**URL:** <https://forum.arduino.cc/t/mysterious-behavior-of-attiny85-and-hardware-interrupts/893705>\
**Category:** 3rd Party Boards\
**Created:** [August 8, 2021, 6:59pm UTC](https://forum.arduino.cc/t/mysterious-behavior-of-attiny85-and-hardware-interrupts/893705 "2021-08-08T18:59:26Z")\
**Posts on this page:** 1\
**Showing post:** 8

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**Author:** ![Coding\_Badly](https://avatars.discourse-cdn.com/v4/letter/c/f14d63/32.png) [@Coding\_Badly](https://forum.arduino.cc/u/Coding_Badly)\
**Post date:** [August 9, 2021, 7:26am UTC](https://forum.arduino.cc/t/mysterious-behavior-of-attiny85-and-hardware-interrupts/893705/8 "2021-08-09T07:26:15Z")

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I believe @JChristensen is the reference. Someone found that the documentation is not accurate and posted their findings on this forum. I recall it being @JChristensen.

I found [this](https://forum.arduino.cc/t/i-want-to-change-from-pcint-to-int0-external-int-on-attiny85/562555/6).

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