Low level documentation

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hello, want learn ardiono base. mean, not using libraries such servos etc, able understand inside,
and able programming myself. making own interruption handling devices connected etc. (not asm code of cource)
what should read? have seen here learning foundations or hacking didnt find needed information.

start here:

avr-libc: http://www.nongnu.org/avr-libc/user-manual/modules.html
atmega328p: http://www.atmel.com/images/doc8271.pdf

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the gadget shield: accelerometer, rgb led, ir transmit/receive, speaker, microphone, light sensor, potentiometer, pushbuttons


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