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Embedded Systems Architecture by Daniele Lacamera

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Asynchronous UART-based serial communication

Asynchronous communication is provided by the Universal Asynchronous Receiver-Transmitter (UART). These kind of interfaces, commonly simply known as serial ports, are called asynchronous because they do not need to share a clock signal to synchronize the sender and the receiver, but rather work on pre-defined clock rates that can be aligned while the communication is ongoing. Microcontrollers may contain multiple UARTs that can be attached to a specific set of pins upon request. Asynchronous communication is provided by UART as a full-duplex channel, through two independent wires, connecting the RX pin of each endpoint to the TX pin on the opposite side.

To properly understand each other, the systems ...

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