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参数资料
| 型号： | XR17D152CMTR-F |
| 厂商： | Exar Corporation |
| 文件页数： | 24/68页 |
| 文件大小： | 0K |
| 描述： | IC UART PCI BUS DUAL 100TQFP |
| 标准包装： | 1,000 |
| 特点： | * |
| 通道数： | 2，DUART |
| FIFO's： | 64 字节 |
| 规程： | RS485 |
| 电源电压： | 3.3V，5V |
| 带自动流量控制功能： | 是 |
| 带IrDA 编码器/解码器： | 是 |
| 带故障启动位检测功能： | 是 |
| 带调制解调器控制功能： | 是 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 100-TQFP |
| 供应商设备封装： | 100-TQFP（14x14） |
| 包装： | 带卷 (TR) |
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XR17D152
á
UNIVERSAL (3.3V AND 5V) PCI BUS DUAL UART
REV. 1.2.0
30
5.4
Automatic Hardware (RTS/CTS or DTR/DSR) Flow Control Operation
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.
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.
TABLE 10: AUTO RTS/CTS OR DTR/DSR FLOW CONTROL SELECTION
MCR BIT-2
EFR BIT-7
EFR BIT-6
HARDWARE FLOW CONTROL SELECTION
0
1
X
Auto CTS Flow Control Enabled
0
X
1
Auto RTS Flow Control Enabled
1
X
Auto DSR Flow Control Enabled
1
X
1
Auto DTR Flow Control Enabled
X
0
No Hardware Flow Control
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相关代理商/技术参数 |
参数描述 |
|---|---|
| XR17D152IM | 制造商:EXAR 制造商全称:EXAR 功能描述:UNIVERSAL (3.3V AND 5V) PCI BUS DUAL UART |
| XR17D152IM-F | 功能描述:UART 接口集成电路 UART RoHS:否 制造商:Texas Instruments 通道数量:2 数据速率:3 Mbps 电源电压-最大:3.6 V 电源电压-最小:2.7 V 电源电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:LQFP-48 封装:Reel |
| XR17D154 | 制造商:EXAR 制造商全称:EXAR 功能描述:UNIVERSAL (3.3V AND 5V) PCI BUS QUAD UART |
| XR17D154CV | 功能描述:UART 接口集成电路 UART RoHS:否 制造商:Texas Instruments 通道数量:2 数据速率:3 Mbps 电源电压-最大:3.6 V 电源电压-最小:2.7 V 电源电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:LQFP-48 封装:Reel |
| XR17D154CV-0A-EVB | 功能描述:界面开发工具 Supports D154 144 ld TQFP, PCI Interface RoHS:否 制造商:Bourns 产品:Evaluation Boards 类型:RS-485 工具用于评估:ADM3485E 接口类型:RS-485 工作电源电压:3.3 V |
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