I²C (Inter-Integrated Circuit) is a multi-master serial computer bus.
Read Wikipedia and I2C匯流排介面單元.ppt for more information.
GPIO (General Purpose I/O), can act as input, to read digital signals from other parts of a circuit, or output, to control or signal to other devices. They are similar to 8051 P0 - P3.
Read Wikipedia for more information.
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Heard this many times, but don't know exactly what they are.
So I found some references today.
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