![]() Oneline is the clock, the other is for data. ![]() This isa two line bi-directional interface designed for medium speed communications between ICs on a board. The ATmega328P has the ability to communicate to other IC’s using the IIC or I2C serial interface. Forexample, a pin might be used as a general purpose I/O line, or it might be ADC input, but it can’t be bothsimultaneously. Most of the pins on the chip are connectedto multiple functional units and it is up to the programmer to decide what a particular pin does. Not all of these functions are available at the same time.
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