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Do I have to use external clock for ATmega ISP programming after changing fuse bits? - Electrical Engineering Stack Exchange
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Arduino Tutorial by Manmohan Pal: Large Seven Segment Digital Clock Using Atmega328/Atmega8 by Manmohan Pal
GitHub - MCUdude/MiniCore: Arduino hardware package for ATmega8, ATmega48, ATmega88, ATmega168, ATmega328 and ATmega328PB
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