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0x133B UART Tx
: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
:Send a byte to the connected device.
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