參數(shù)資料
型號： XR17D152
廠商： Exar Corporation
英文描述： UNIVERSAL (3.3V AND 5V) PCI BUS DUAL UART
中文描述： 通用（3.3V和5V）PCI總線的雙UART
文件頁數(shù)： 30/68頁
文件大小： 772K
代理商： XR17D152
XR17D152
UNIVERSAL (3.3V AND 5V) PCI BUS DUAL UART
á
REV. 1.2.0
30
5.4
Automatic hardware RTS/CTS or DTR/DSR flow control is used to prevent data overrun to the local receiver
FIFO and remote receiver FIFO. The RTS#/DTR# output pin is used to request the remote unit to suspend/
restart data transmission while the CTS#/DSR# input pin is monitored to suspend/restart the local transmitter.
The auto RTS/CTS or DTR/DSR flow control features are individually selected to fit specific application
requirement and enabled through EFR bit-6 and 7 and MCR bit-2 for either RTS/CTS or DTR/DSR control
signals.
Automatic Hardware (RTS/CTS or DTR/DSR) Flow Control Operation
Auto RTS flow control must be started by asserting the RTS# output pin LOW (MCR bit-1 = 1). Similarly, Auto
DTR flow control must be started by asserting the DTR# output pin LOW (MCR bit-0 = 1).
Figure 16
shows in
detail how automatic hardware flow control works.
Two interrupts associated with auto RTS/CTS and DTR/DSR flow control have been added to give indication
when RTS#/DTR# pin or CTS#/DSR# pin are de-asserted during operation. These interrupts are enabled by:
Setting EFR bit-4 =1 to enable the shaded register bits
Setting IER bit-7 will enable the CTS#/DSR# interrupt when these pins are de-asserted. The selection of
CTS# or DSR# is selected via MCR bit-2. See
Table 10
above for complete details.
Setting IER bit-6 will enable the RTS#/DTR# interrupt when these pins are de-asserted. The selection of
RTS# or DTR# is selected via MCR bit-2. See
Table 10
above for complete details.
Automatic hardware flow control is selected by setting bits 6 (RTS) and 7 (CTS) of the EFR register to logic 1.
If CTS# pin transitions from LOW to HIGH indicating a flow control request, ISR bit-5 will be set to logic 1, (if
enabled via IER bit 6-7), and the UART will suspend TX transmissions as soon as the stop bit of the character
in process is shifted out. Transmission is resumed after the CTS# input returns LOW, indicating more data may
be sent.
T
ABLE
10: A
UTO
RTS/CTS
OR
DTR/DSR F
LOW
C
ONTROL
S
ELECTION
MCR B
IT
-2
EFR B
IT
-7
EFR B
IT
-6
H
ARDWARE
F
LOW
C
ONTROL
S
ELECTION
0
1
X
Auto CTS Flow Control Enabled
0
X
1
Auto RTS Flow Control Enabled
1
1
X
Auto DSR Flow Control Enabled
1
X
1
Auto DTR Flow Control Enabled
X
0
0
No Hardware Flow Control
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
XR17D152CM 制造商:EXAR 制造商全稱:EXAR 功能描述:UNIVERSAL (3.3V AND 5V) PCI BUS DUAL UART
XR17D152CM-0A-EVB 功能描述:界面開發(fā)工具 Supports D152 100 ld TQFP, PCI 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
XR17D152CM-F 功能描述:UART 接口集成電路 3.3V-5V 64B FIFO temp 0C to 70C; UART RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel
XR17D152CMTR-F 功能描述:UART 接口集成電路 UART RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel
XR17D152IM 制造商:EXAR 制造商全稱:EXAR 功能描述:UNIVERSAL (3.3V AND 5V) PCI BUS DUAL UART
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