參數(shù)資料
型號： XR19L212IL48-F
廠商： Exar Corporation
文件頁數(shù)： 9/52頁
文件大?。?/td> 0K
描述： IC UART/TXRX RS232 48QFN
標(biāo)準(zhǔn)包裝： 260
特點： *
通道數(shù)： 2，DUART
FIFO's： 64 字節(jié)
規(guī)程： RS232
電源電壓： 3.3 V ~ 5.5 V
帶自動流量控制功能： 是
帶IrDA 編碼器/解碼器： 是
帶故障啟動位檢測功能： 是
帶調(diào)制解調(diào)器控制功能： 是
帶CMOS： 是
安裝類型： 表面貼裝
封裝/外殼： 48-VFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 48-QFN-EP（7x7）
包裝： 托盤
XR19L212
17
REV. 1.0.1
TWO CHANNEL INTEGRATED UART AND RS-232 TRANSCEIVER
2.15
Auto CTS Flow Control
Automatic CTS flow control is used to prevent data overrun to the remote receiver FIFO. The CTS input is
monitored to suspend/restart the local transmitter. The auto CTS flow control feature is selected to fit specific
application requirement (see Figure 11):
Enable auto CTS flow control using EFR bit-7.
If using the Auto CTS interrupt:
Enable CTS interrupt through IER bit-7 (after setting EFR bit-4). The UART issues an interrupt when the CTS
pin is de-asserted: ISR bit-5 will be set to 1, and UART will suspend transmission as soon as the stop bit of
the character in process is shifted out. Transmission is resumed after the CTS input is re-asserted, indicating
more data may be sent.
FIGURE 11. AUTO RTS AND CTS FLOW CONTROL OPERATION
The signals shown in this figure are the signals at the UART and not at the RS-232 transceiver.
The local UART (UARTA) starts data transfer by asserting RTSA# (1). RTSA# is normally connected to CTSB# (2) of
remote UART (UARTB). CTSB# allows its transmitter to send data (3). TXB data arrives and fills UARTA receive FIFO
(4). When RXA data fills up to its receive FIFO trigger level, UARTA activates its RXA data ready interrupt (5) and con-
tinues to receive and put data into its FIFO. If interrupt service latency is long and data is not being unloaded, UARTA
monitors its receive data fill level to match the upper threshold of RTS delay and de-assert RTSA# (6). CTSB# follows
(7) and request UARTB transmitter to suspend data transfer. UARTB stops or finishes sending the data bits in its trans-
mit shift register (8). When receive FIFO data in UARTA is unloaded to match the lower threshold of RTS delay (9),
UARTA re-asserts RTSA# (10), CTSB# recognizes the change (11) and restarts its transmitter and data flow again until
next receive FIFO trigger (12). This same event applies to the reverse direction when UARTA sends data to UARTB
with RTSB# and CTSA# controlling the data flow.
RTSA#
CTSB#
RXA
TXB
Transmitter
Receiver FIFO
Trigger Reached
Auto RTS
Trigger Level
Auto CTS
Monitor
RTSA#
TXB
RXA FIFO
CTSB#
Remote UART
UARTB
Local UART
UARTA
ON
OFF
ON
Suspend
Restart
RTS High
Threshold
Data Starts
ON
OFF
ON
Assert RTS# to Begin
Transmission
1
2
3
4
5
6
7
Receive
Data
RTS Low
Threshold
9
10
11
Receiver FIFO
Trigger Reached
Auto RTS
Trigger Level
Transmitter
Auto CTS
Monitor
RTSB#
CTSA#
RXB
TXA
INTA
(RXA FIFO
Interrupt)
RX FIFO
Trigger Level
RX FIFO
Trigger Level
8
12
RTSCTS1
相關(guān)PDF資料
PDF描述
XR19L220IL40-F IC UART/TXRX RS232 40QFN
XR19L222IL64-F IC UART/TXRX RS232 64QFN
XR19L400IL40-F IC UART/TXRX RS485 40QFN
XR19L402IL48-F IC UART/TXRX RS485 48QFN
XR20M1170IL24TR-F IC UART FIFO I2C/SPI 64B 24QFN
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
XR19L212IL48TR-F 制造商:Exar Corporation 功能描述:UART 2-CH 64Byte FIFO 5V 48-Pin QFN EP T/R 制造商:Exar Corporation 功能描述:XR19L212IL48TR-F
XR19L220 制造商:EXAR 制造商全稱:EXAR 功能描述:SINGLE CHANNEL INTEGRATED UART AND RS-232 TRANSCEIVER
XR19L220_07 制造商:EXAR 制造商全稱:EXAR 功能描述:SINGLE CHANNEL INTEGRATED UART AND RS-232 TRANSCEIVER
XR19L220IL40 制造商:EXAR 制造商全稱:EXAR 功能描述:SINGLE CHANNEL INTEGRATED UART AND RS-232 TRANSCEIVER
XR19L220IL40-0A-EB 功能描述:界面開發(fā)工具 Supports L220 40 pin QFN, ISA Interface RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類型:RS-485 工具用于評估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*