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TL16C754BFN bảng dữ liệu(PDF) 7 Page - Texas Instruments |
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TL16C754BFN bảng dữ liệu(HTML) 7 Page - Texas Instruments |
7 / 37 page TL16C754B QUAD UART WITH 64-BYTE FIFO SLLS397 – NOVEMBER 1999 7 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 functional description (continued) auto-CTS The transmitter circuitry checks CTS before sending the next data byte. When CTS is active, the transmitter sends the next byte. To stop the transmitter from sending the following byte, CTS must be deasserted before the middle of the last stop bit that is currently being sent. The auto-CTS function reduces interrupts to the host system. When flow control is enabled, the CTS state changes and need not trigger host interrupts because the device automatically controls its own transmitter. Without auto-CTS, the transmitter sends any data present in the transmit FIFO and a receiver overrun error can result. Figure 2 shows CTS functional timing, and Figure 3 shows an example of autoflow control. Byte 0–7 Stop Start Byte 0–7 Stop Start TX CTS NOTES: A. When CTS is low, the transmitter keeps sending serial data out. B. When CTS goes high before the middle of the last stop bit of the current byte, the transmitter finishes sending the current byte, but it does not send the next byte. C. When CTS goes from high to low, the transmitter begins sending data again. Figure 2. CTS Functional Timing Serial to Parallel Flow Control Parallel to Serial Flow Control RX FIFO TX FIFO Parallel to Serial Flow Control Serial to Parallel Flow Control TX FIFO RX FIFO D7–D0 D7–D0 UART 1 UART 2 RX RTS TX CTS TX CTS RX RTS Figure 3. Autoflow Control (Auto-RTS and Auto-CTS) Example software flow control Software flow control is enabled through the enhanced feature register and the modem control register. Different combinations of software flow control can be enabled by setting different combinations of EFR[3–0]. Table 1 shows software flow control options. Two other enhanced features relate to S/W flow control: – Xon Any Function [MCR(5): Operation will resume after receiving any character after recognizing the Xoff character. |
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