REV. 1.0.0 3.9 Setup/Hysteresis Register (SHR) - Write Onl" />
參數(shù)資料
型號(hào): XR20M1280IL24-F
廠商: Exar Corporation
文件頁(yè)數(shù): 35/63頁(yè)
文件大?。?/td> 0K
描述: IC UART I2C/SPI 128 BYTE 24QFN
產(chǎn)品培訓(xùn)模塊: UART Product Overview
XR21V141x Full-Speed USB UART Family
標(biāo)準(zhǔn)包裝: 490
通道數(shù): 1,UART
FIFO's: 128 字節(jié)
規(guī)程: RS485
電源電壓: 1.62 V ~ 3.63 V
帶自動(dòng)流量控制功能:
帶IrDA 編碼器/解碼器:
帶故障啟動(dòng)位檢測(cè)功能:
帶調(diào)制解調(diào)器控制功能:
安裝類型: 表面貼裝
封裝/外殼: 24-VFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 24-QFN 裸露焊盤(4x4)
包裝: 托盤
其它名稱: 1016-1379
XR20M1280
40
I2C/SPI UART WITH 128-BYTE FIFO AND INTEGRATED LEVEL SHIFTERS
REV. 1.0.0
3.9
Setup/Hysteresis Register (SHR) - Write Only
In the Auto RS-485 half-duplex mode, the RTS# control output can be asserted from 0 to 15 bit times before
data is transmitted to allow for the startup time of an RS-485 transceiver that may be in shutdown mode. The
RTS# control output can also be delayed from 0 to 15 bit times after the last byte has been transmitted to allow
the data to propogate down long data cables.
In the Auto RTS flow control mode, this register selects the hysteresis levels that will be used with
programmable trigger levels (Trigger Table-D).
SHR[3:0]: RS-485 Turn-Around Delay / Auto RTS Hysteresis
When the Auto RS-485 half-duplex mode is enabled (FCTR[3] = 1), the value programmed in these bits will be
the number of bits (0-15) the RTS# pin will wait before it is de-asserted after the last byte that has been
transmitted.
When Auto RTS flow control is enabled (EFR[6] = 1) and programmable trigger levels are used (FCTR[5:4] =
’11’), these bits select the hysteresis levels for the RTS# flow control pin (See Table 15).
TABLE 15: AUTO RTS HYSTERESIS
SHR BIT-3
SHR BIT-2
SHR BIT-1
SHR BIT-0
RTS# HYSTERESIS
(CHARACTERS)
0
1
0
1
0
1
0
±4
±6
±8
0
1
0
1
0
1
0
1
±8
±16
±24
±32
1
0
1
0
1
0
1
±40
±44
±48
±52
1
0
1
0
1
0
1
±12
±20
±28
±36
SHR[7:4]: RS-485 Setup Delay
When the Auto RS-485 half-duplex mode is enabled (FCTR[3] = 1), the value programmed in these bits will be
the number of bits (0-15) the RTS# pin is asserted before the first byte is transmitted.
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