Flags3

      Has the following bits:

      Bit 0

        Enable Write Infinite Timeout processing. See Note 8.
      Bits 1-2
        Enable Read Timeout processing. See Note 9.

          Bit 2

            Bit 1 Description
          0
            0 Invalid input. Results in a general failure error.
          0
            1 Normal Read Timeout processing
          1
            0 Wait-For-Something Read Timeout processing
          1
            1 No-Wait Read Timeout processing.
          Bits 3-4
            Extended Hardware Buffering. See Note 10.

              Bit 4

                Bit 3 Description
              0
                0 Not supported; ignored. No change to FIFO state.
              0
                1 Disabled
              1
                0 Enabled
              1
                1 Automatic Protocol Override.
              Bits 5-6
                Received trigger level. See Note 11.

                  Bit 6

                    Bit 5 Description
                  0
                    0 1 character
                  0
                    1 4 characters
                  1
                    0 8 characters
                  1
                    1 14 characters
                  Note: The trigger level must be set to 1 character when Enhanced mode is on.
                Bit 7
                  Transmit Buffer Load Count. See Note 12.

                • character 1 =
                    16 characters.
                  Note: When Extended Hardware Buffering is disabled, this bit is set by the device driver.

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