Datasheet

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
TL16C752B-EP
www.ti.com SGLS153B –FEBRUARY 2003–REVISED DECEMBER 2007
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.
There are two other enhanced features relating to S/W flow control:
• Xon Any Function [MCR(5)]: Operation resumes after receiving any character after recognizing the Xoff
character.
NOTE
It is possible that an Xon1 character is recognized as an Xon Any character which could
cause an Xon2 character to be written to the RX FIFO.
• Special Character [EFR(5)]: Incoming data is compared to Xoff2. Detection of the special character sets the
Xoff interrupt [IIR(4)] but does not halt transmission. The Xoff interrupt is cleared by a read of the IIR. The
special character is transferred to the RX FIFO.
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