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0x133B UART Tx (R) :bit 7 = 1 if the Rx is in a break condition ; external device has held Tx=0 for at least 20 bit periods :bit 6 = 1 if the Rx experienced a framing error ; (clears on read, includes parity and stop bit errors) :bit 5 = 1 if the next Rx byte was received after an error condition was detected (framing, overflow) :bit 4 = 1 if the Tx buffer is empty :bit 3 = 1 if the Rx buffer is near full (3/4) :bit 2 = 1 if the Rx buffer overflowed ; (clears on read) :bit 1 = 1 if the Tx buffer is full :bit 0 = 1 if the Rx buffer contains bytes (W) :Send a byte to the connected device.
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