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Я дклаю так как написано вот здесь и все в норме попробуй так же!
• Bit 6 – TXC: UART Transmit Complete
This bit is set (one) when the entire character (including the stop bit) in the Transmit
Shift register has been shifted out and no new data has been written to UDR. This flag is
especially useful in half-duplex communications interfaces, where a transmitting application
must enter receive mode and free the communications bus immediately after
completing the transmission.
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