REV. 1.0.1 2.10 Auto RTS (Hardware) Flow Control Automatic R" />
參數(shù)資料
型號： XR16M781IB25-F
廠商： Exar Corporation
文件頁數(shù)： 8/52頁
文件大?。?/td> 0K
描述： IC UART FIFO 64B 25BGA
標準包裝： 714
特點： *
通道數(shù)： 1，UART
FIFO's： 64 字節(jié)
規(guī)程： RS232，RS422，RS485
電源電壓： 1.62 V ~ 3.63 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
帶調制解調器控制功能： 是
帶CMOS： 是
安裝類型： 表面貼裝
封裝/外殼： 25-WFBGA
供應商設備封裝： 25-BGA（3x3）
包裝： 托盤
其它名稱： 1016-1462
XR16M781IB25-F-ND
XR16M781
16
1.62V TO 3.63V UART WITH 64-BYTE FIFO AND VLIO INTERFACE
REV. 1.0.1
2.10
Auto RTS (Hardware) Flow Control
Automatic RTS hardware flow control is used to prevent data overrun to the local receiver FIFO. The RTS#
output is used to request remote unit to suspend/resume data transmission. The auto RTS flow control
features is enabled to fit specific application requirement (see Figure 12):
Enable auto RTS flow control using EFR bit-6.
The auto RTS function must be started by asserting RTS# output pin (MCR bit-1 to logic 1 after it is enabled).
If using the Auto RTS interrupt:
Enable RTS interrupt through IER bit-6 (after setting EFR bit-4). The UART issues an interrupt when the
RTS# pin makes a transition from low to high: ISR bit-5 will be set to logic 1.
2.11
Auto RTS Hysteresis
With the Auto RTS function enabled, an interrupt is generated when the receive FIFO reaches the selected RX
trigger level. The RTS# pin will not be forced HIGH (RTS off) until the receive FIFO reaches one trigger level
above the selected trigger level in the trigger table (Table 9). The RTS# pin will return LOW after the RX FIFO
is unloaded to one level below the selected trigger level. Under the above described conditions, the M781 will
continue to accept data until the receive FIFO gets full. The Auto RTS function is initiated when the RTS#
output pin is asserted LOW (RTS On).
TABLE 4: AUTO RTS (HARDWARE) FLOW CONTROL
RX TRIGGER LEVEL
INT PIN ACTIVATION
RTS# DE-ASSERTED (HIGH)
(CHARACTERS IN RX FIFO)
RTS# ASSERTED (LOW)
(CHARACTERS IN RX FIFO)
8
16
0
16
56
8
56
60
16
60
56
2.12
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 12):
Enable auto CTS flow control using EFR bit-7.
If needed, the CTS interrupt can be enabled through IER bit-7 (after setting EFR bit-4). The UART issues an
interrupt when the CTS# pin is de-asserted (HIGH): ISR bit-5 will be set to 1, and UART will suspend
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相關代理商/技術參數(shù)
參數(shù)描述
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