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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

Write to this port sends the byte to serial port (routed to WiFi module connector). Read from this port returns 0 if there are bytes to read in RX FIFO buffer, or 1 if no RX data.