參數(shù)資料
型號(hào)： TL16C2552RHB
廠商： Texas Instruments, Inc.
英文描述： 1.8-V to 5-V DUAL UART WITH 16-BYTE FIFOS
中文描述： 1.8 V至5 V雙的UART具有16字節(jié)FIFO
文件頁(yè)數(shù)： 6/34頁(yè)
文件大?。?/td> 407K
代理商： TL16C2552RHB
www.ti.com
Auto-CTS (See
Figure 2
)
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.
Enabling Autoflow Control and Auto-CTS
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).
Auto-CTS and Auto-RTS Functional Timing
Start
Bits 07
Start
Bits 07
Start
Bits 07
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
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
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