First a bit of background: I have an ATmega324a MCU (should be the same as the p and pa variant) with a 8 MHz crystal (should use 18 pF caps, I've put 15 pF). It runs on 5V (supplied by a working Arduino Duemilanove). I have a test LED on PA7, USART0 on PD0/PD1 connected to MAX232 to a real serial…

ATmega324, The Quest of a Bootloader

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