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-The USART Synchronous Driver
-============================
-
-The universal synchronous and asynchronous receiver and transmitter
-(USART) is usually used to transfer data from one device to the other.
-
-User can set action for flow control pins by function usart_set_flow_control,
-if the flow control is enabled. All the available states are defined in union
-usart_flow_control_state.
-
-Note that user can set state of flow control pins only if automatic support of
-the flow control is not supported by the hardware.
-
-Features
---------
-
-* Initialization/de-initialization
-* Enabling/disabling
-* Control of the following settings:
-
-  * Baudrate
-  * UART or USRT communication mode
-  * Character size
-  * Data order
-  * Flow control
-* Data transfer: transmission, reception
-
-Applications
-------------
-
-They are commonly used in a terminal application or low-speed communication
-between devices.
-
-Dependencies
-------------
-
-USART capable hardware.
-
-Concurrency
------------
-
-Write buffer should not be changed while data is being sent.
-
-
-Limitations
------------
-
-* The driver does not support 9-bit character size.
-* The "USART with ISO7816" mode can be only used in ISO7816 capable devices. 
-  And the SCK pin can't be set directly. Application can use a GCLK output PIN
-  to generate SCK. For example to communicate with a SMARTCARD with ISO7816
-  (F = 372 ; D = 1), and baudrate=9600, the SCK pin output frequency should be
-  config as 372*9600=3571200Hz. More information can be refer to ISO7816 Specification.
-
-Known issues and workarounds
-----------------------------
-
-N/A