Serial Communication - SparkFun Learn
https://learn.sparkfun.com/tutorials/serial-communication/all
WEBAn 8-bit data bus, controlled by a clock, transmitting a byte every clock pulse. 9 wires are used. Serial interfaces stream their data, one single bit at a time. These interfaces can operate on as little as one wire, usually never more than four. Example of a serial interface, transmitting one bit every clock pulse. Just 2 wires required!
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