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TL16C750FNR Folha de dados(PDF) 6 Page - Texas Instruments |
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TL16C750FNR Folha de dados(HTML) 6 Page - Texas Instruments |
6 / 35 page TL16C750 ASYNCHRONOUS COMMUNICATIONS ELEMENT WITH 64-BYTE FIFOs AND AUTOFLOW CONTROL SLLS191C – JANUARY 1995 – REVISED DECEMBER 1997 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 autoflow control (continued) Serial to Parallel Flow Control Parallel to Serial Flow Control Parallel to Serial Flow Control Serial to Parallel Flow Control XMT FIFO RCV FIFO ACE1 ACE2 D7– D0 D7– D0 SIN SOUT RTS CTS SOUT SIN CTS RTS XMT FIFO RCV FIFO Figure 1. Autoflow Control (auto-RTS and auto-CTS) Example auto-RTS (see Figure 1) Auto-RTS data flow control originates in the receiver timing and control block (see functional block diagram) and is linked to the programmed receiver FIFO trigger level. When the receiver FIFO level reaches a trigger level of 1, 4, 8, or 14 in 16-byte mode or 1, 16, 32, or 56 in 64-byte mode, RTS is deasserted. The sending ACE may send an additional byte after the trigger level is reached (assuming the sending ACE has another byte to send) because it may not recognize the deassertion of RTS until after it has begun sending the additional byte. RTS is automatically reasserted once the receiver FIFO is emptied by reading the receiver buffer register. The reassertion signals the sending ACE to continue transmitting data. auto-CTS (see Figure 1) 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 released 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 does 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. enabling auto-RTS and auto-CTS The auto-RTS and auto-CTS modes of operation are activated by setting bit 5 of the modem control register (MCR) to 1 (see Figure 2). Start Bits 0 – 7 Start Bits 0 – 7 Start Bits 0 – 7 Stop Stop Stop SOUT 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 |
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