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TUSB5052 Datasheet(PDF) 52 Page - Texas Instruments |
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TUSB5052 Datasheet(HTML) 52 Page - Texas Instruments |
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52 / 82 page ![]() 7−4 Table 7−2. Transmitter Flow-Control Modes MODE 3 2 1 0 MODE DSR CTS TXOA TXOF 0 All flow control is disabled. 0 0 0 0 1 Xon/Xoff flow control is enabled. 0 0 0 1 2 Xon on any/ Xoff flow control 0 0 1 0 3 Not permissible (see Note 1) X X 1 1 4 CTS flow control 0 1 0 0 5 Combination flow control (see Note 2) 0 1 0 1 6 Combination flow control 0 1 1 0 8 DSR flow control 1 0 0 0 9-E Combination flow control NOTES: 1. This is an impermissible combination. If used, TXOA and TXOF are cleared. 2. Combination example: Transmitter stops when either CTS or Xoff is detected. Transmitter resumes when both CTS is negated and Xon is detected. Table 7−3. Receiver Flow-Control Modes MODE 6 5 4 MODE CTS TXOA TXOF 0 All flow control is disabled. 0 0 0 1 Xon/Xoff flow control is enabled. 0 0 1 2 RTS flow control 0 1 0 3 Combination flow control (see Note 3) 0 1 1 4 DTR flow control 1 0 0 5 Combination flow control 1 0 1 6 Combination flow control (see Note 4) 1 1 0 7 Combination flow control 1 1 1 NOTES: 3. Combination example: TRS is asserted and Xoff is transmitted when FIFO is full. TRS is deasserted and Xon is transmitted when FIFO is empty. 4. Combination example: Both DTR and RTS are asserted when FIFO is full. Both DTR and RTS are deasserted when FIFO is empty. 7.1.4.1 Transmitter Flow Control On reset (power-up, USB, or soft-reset) the transmitter defaults to the Xon state and the flow control is set to mode 0 (flow control is disabled). |
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