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TL16C2550IPFB 数据表(PDF) 6 Page - Texas Instruments

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部件名 TL16C2550IPFB
功能描述  2.5-V to 5-V DUAL UART WITH 16-BYTE FIFOS
Download  34 Pages
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

TL16C2550IPFB 数据表(HTML) 6 Page - Texas Instruments

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RCV
FIFO
Serial to
Parallel
Flow
Control
XMT
FIFO
Parallel
to Serial
Flow
Control
Parallel
to Serial
Flow
Control
Serial to
Parallel
Flow
Control
XMT
FIFO
RCV
FIFO
ACE1
ACE2
D7 −D0
SIN
SOUT
RTS
CTS
SOUT
SIN
CTS
RTS
D7 −D0
Auto-RTS (see Figure 2)
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
TL16C2550
SLWS161 – JUNE 2005
Figure 2. Autoflow Control (Auto-RTS and Auto-CTS) Example
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, or 8 (see Figure 3), RTS is deasserted. With trigger levels of 1, 4, and 8, 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 RCV FIFO is emptied by reading the receiver buffer register.
When the trigger level is 14 (see Figure 4), RTS is deasserted after the first data bit of the 16th character is
present on the RX line. RTS is reasserted when the RCV FIFO has at least one available byte space.
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 3. CTS Functional Timing Waveforms
6


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