spi with bare atmega328 - Project Guidance - Arduino Forum
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Atmega32 - Atmega8 Master-Slave SPI Communication : 4 Steps (with Pictures) - Instructables
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Programming an AVR ATmega328P with an Arduino
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ATmega328P Pinout | IC Packages, Pinouts and Pin Description - ElectronicsHub
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Tutorial 36: ATMEGA328P AVR (Arduino) Programming via GPIO (SPI) - The Zan Show
