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TL16C754BFN bảng dữ liệu(PDF) 7 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  QUAD UART WITH 64-BYTE FIFO
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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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