Halts the clock supplied to the asynchronous serial interface LIN-UART (UARTF).
Remark         
Calling this API function changes the asynchronous serial interface LIN-UART 
(UARTF) to reset status.
For this reason, writes to the control registers 
after this API function is called are ignored.
[Syntax]
void R_UARTFn_Set_PowerOff ( void );
Remark n is the channel number.
[Argument(s)]
None.
[Return value]
None.