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USART driver
======================
The Universal Synchronous and Asynchronous serial Receiver and Transmitter (USART) peripheral is a
fast and flexible serial communication module. The USART supports full-duplex communication,
asynchronous and synchronous operation and one-wire configurations. The USART can be set in SPI
master mode and used for SPI communication.

Features
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* Initialization

Applications
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* Terminal application
* Low-speed communication between devices.

Dependencies
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* CLKCTRL/CLK for clock
* PORT for I/O lines and connections
* CPUINT/PMIC for Interrupt
* EVSYS for events
* UPDI/PDI/JTAG for debug

Concurrency
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N/A

Limitations
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N/A

Knows issues and workarounds
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N/A

