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Arduino Internals by Dale Wheat

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AVR Device Families

The 8-bit AVR family from Atmel has several branches. The ATmega328 at the heart of modern Arduinos is a member of the ATmega family, but so is the ATmega2560, the computer chip of the Arduino Mega. This could possibly lead to the idea that one version is mega and the other one is somehow less than mega, when in truth they’re both technically ATmega.

There is also an AVR tiny family and a classic family. Additionally, Atmel has introduced a USB line (a member of which functions as the USB serial port adapter on the Arduino Uno and Arduino Mega) and an enhanced XMega family, with higher clock speeds and more functionality. More specialized families continue to be developed by Atmel.

Atmel has also designed and produced a 32-bit ...

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