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Number $133B
Decimal 4923
Short desc. Sends byte to serial port. If read, tells if data in RX buffer
Bit Mask %0001 0011 0011 1011
Readable Yes
Writable Yes
Subsystem UART


send a byte to the connected device. There is no Tx buffer so the program must make sure the last transmission is completed before sending another byte.


bit 2 = 1 if the read buffer is full
bit 1 = 1 if the transmitter is busy sending a byte
bit 0 = 1 if the read buffer contains received bytes