REV. 1.0.2 66MHZ PCI BUS OCTAL UART WITH POWER MANAGEMENT SUPPORT MSR[1]: Delta DSR# Input Flag
參數(shù)資料
型號: XR17V258IVTR-F
廠商: Exar Corporation
文件頁數(shù): 49/69頁
文件大小: 0K
描述: IC UART PCI BUS OCTAL 144LQFP
標(biāo)準(zhǔn)包裝: 750
特點(diǎn): *
通道數(shù): 8
FIFO's: 64 字節(jié)
規(guī)程: RS485
電源電壓: 3.3V,5V
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: 144-LQFP
供應(yīng)商設(shè)備封裝: 144-LQFP(20x20)
包裝: 帶卷 (TR)
XR17V258
53
REV. 1.0.2
66MHZ PCI BUS OCTAL UART WITH POWER MANAGEMENT SUPPORT
MSR[1]: Delta DSR# Input Flag
Logic 0 = No change on DSR# input (default).
Logic 1 = The DSR# input has changed state since the last time it was monitored. A modem status interrupt
will be generated if MSR interrupt is enabled (IER bit [3]).
MSR[0]: Delta CTS# Input Flag
Logic 0 = No change on CTS# input (default).
Logic 1 = The CTS# input has changed state since the last time it was monitored. A modem status interrupt
will be generated if MSR interrupt is enabled (IER bit [3]).
5.11
Modem Status Register (MSR) - Write Only
The upper four bits [7:4] of this register set the delay in number of bits time for the auto RS-485 turn around
from transmit to receive.
MSR [7:4]: Auto RS485 Turn-Around Delay (requires EFR bit [4]=1)
When Auto RS485 feature is enabled (FCTR bit [5]=1) and RTS# output is connected to the enable input of a
RS-485 transceiver. These 4 bits select from 0 to 15 bit-time delay after the end of the last stop-bit of the last
transmitted character. This delay controls when to change the state of RTS# output. This delay is very useful in
long-cable networks. Table 19 shows the selection. The bits are enabled by EFR bit [4].
TABLE 19: AUTO RS485 HALF-DUPLEX DIRECTION CONTROL DELAY FROM TRANSMIT-TO-RECEIVE
DELAY IN DATA BIT(S) TIME
0
1
0
1
0
2
0
1
3
0
1
0
4
9
1
0
1
5
0
1
0
6
0
1
7
1
0
8
1
0
1
9
1
0
1
0
10
1
0
1
11
1
0
12
1
0
1
13
1
0
14
1
15
MSR[7]
MSR[6]
MSR[5]
MSR[4]
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