REV. 1.3.2 44 MSR[5]: DSR Input Status This input may be used for auto DTR/DSR flow control function, see “Sec" />
參數資料
型號: XR17C154IV
廠商: Exar Corporation
文件頁數: 39/62頁
文件大小: 0K
描述: IC UART PCI BUS QUAD 144LQFP
產品變化通告: Leaded UART, V&I Obsolescence 11/Apr/2011
標準包裝: 60
特點: *
通道數: 4,QUART
FIFO's: 64 字節(jié)
規(guī)程: RS485
電源電壓: 5V
帶自動流量控制功能:
帶IrDA 編碼器/解碼器:
帶故障啟動位檢測功能:
帶調制解調器控制功能:
安裝類型: 表面貼裝
封裝/外殼: 144-LQFP
供應商設備封裝: 144-LQFP(20x20)
包裝: 托盤
XR17C154
xr
5V PCI BUS QUAD UART
REV. 1.3.2
44
MSR[5]: DSR Input Status
This input may be used for auto DTR/DSR flow control function, see “Section 4.4, Automatic Hardware
(RTS/CTS or DTR/DSR) Flow Control Operation” on page 29 for complete details. If automatic hardware
flow control is not used, this bit is the compliment of the DSR# input. In the loopback mode, this bit is
equivalent to the DTR# bit in the MCR register. The DSR# input may be used as a general purpose input when
the modem interface is not used.
MSR[6]: RI Input Status
This bit is the compliment of the RI# input. In the loopback mode this bit is equivalent to bit-2 in the MCR
register. The RI# input may be used as a general purpose input when the modem interface is not used.
MSR[7]: CD Input Status
This bit is the compliment of the CD# input. In the loopback mode this bit is equivalent to bit-3 in the MCR
register. The CD# input may be used as a general purpose input
4.8.11
Modem Status Register (MSR) - Write-Only
The upper four bits 4-7 of this register sets the delay in number of bits time for the auto RS485 turn around
from transmit to receive.
MSR [7:4]
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 16 shows the selection. The bits are enabled by EFR bit-4.
TABLE 16: AUTO RS485 HALF-DUPLEX DIRECTION CONTROL DELAY FROM TRANSMIT-TO-RECEIVE
MSR[7]
MSR[6]
MSR[5]
MSR[4]
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
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