GitHub - wagiminator/ATtiny84-TinyCalibrator: OSC Calibrator and High-Voltage Fuse Resetter for 8-Pin ATtinys
PB4 pin of ATtiny85 is low when using External Crystal of 16MHz connected on XTAL1 pin. | AVR Freaks
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Mega Tiny Time Watch: a minimalist watch based on an ATtiny414 and 12 LEDs_Hacker News Digest - MdEditor
![41J Blog » Blog Archive » Reprogramming a ATTINY85 to use an external oscillator using the Arduino IDE 41J Blog » Blog Archive » Reprogramming a ATTINY85 to use an external oscillator using the Arduino IDE](http://41j.com/blog/wp-content/uploads/2018/08/IMG_8486.jpg)