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TL16C2552IFN 데이터시트(PDF) 6 Page - Texas Instruments |
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TL16C2552IFN 데이터시트(HTML) 6 Page - Texas Instruments |
6 / 34 page www.ti.com Auto-CTS (See Figure 2) Enabling Autoflow Control and Auto-CTS Auto-CTS and Auto-RTS Functional Timing Start Bits 0 −7 Start Bits 0 −7 Start Bits 0 −7 Stop Stop Stop SOUT CTS Start Byte N Start Byte N+1 Start Byte Stop Stop Stop SIN RTS RD (RD RBR) 1 2 N N+1 Byte 14 Byte 15 SIN RTS RD (RD RBR) Start Byte 18 Stop Start Byte 16 Stop RTS Released After the First Data Bit of Byte 16 TL16C2552 SLWS163A – SEPTEMBER 2005 – REVISED JUNE 2006 The transmitter circuitry checks CTS before sending the next data byte. When CTS is active, it 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 (see Figure 2). The auto-CTS function reduces interrupts to the host system. When flow control is enabled, CTS level changes do 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 may result. Autoflow control is enabled by setting modem control register bits 5 (autoflow enable or AFE) and 1 (RTS) to a 1. Autoflow incorporates both auto-RTS and auto-CTS. When only auto-CTS is desired, bit 1 in the modem control register should be cleared (this assumes that a control signal is driving CTS). Figure 2. CTS Functional Timing Waveforms Figure 3. RTS Functional Timing Waveforms, RCV FIFO Trigger Level = 1, 4, or 8 Bytes Figure 4. RTS Functional Timing Waveforms, RCV FIFO Trigger Level = 14 Bytes 6 Submit Documentation Feedback |
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