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| 型号： | XR18W750IL48-F |
| 厂商： | Exar Corporation |
| 文件页数： | 15/44页 |
| 文件大小： | 0K |
| 描述： | IC WIRELESS UART CTRLR 48QFN |
| 标准包装： | 260 |
| 功能： | 控制器 |
| RF 型： | 通用 |
| 次要属性： | I²C 接口 |
| 封装/外壳： | 48-VFQFN 裸露焊盘 |
| 包装： | 托盘 |
| 其它名称： | 1016-1473 XR18W750IL48-F-ND |
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XR18W750
REV. 1.0.0
WIRELESS UART CONTROLLER
F IGURE 8. R ECEIVER O PERATION IN FIFO AND A UTO RTS F LOW C ONTROL M ODE
16X Clock
Receive Data Shift
Data Bit
Register (RSR)
Validation
Example
Receive Data Characters
64 bytes by 11-bit
wide
FIFO
- : RX FIFO trigger level selected at 16 bytes
(See Note Below)
Data falls to 8 RTS# re-asserts when data falls below the flow
control trigger level to restart remote transmitter.
Receive Data
Byte and Errors
Receive
Data FIFO
Receive
Data
FIFO
Trigger=16
Data fills to 24
Enable by EFR bit-6=1, MCR bit-1.
RHR Interrupt (ISR bit-2) programmed for
desired FIFO trigger level.
FIFO is Enabled by FCR bit-0=1
RTS# de-asserts when data fills above the flow
control trigger level to suspend remote transmitter.
Enable by EFR bit-6=1, MCR bit-1.
RXFIFO1
N OTE : Table-B selected as Trigger Table for Figure 8 ( Table 10 ).
3.11
Auto RTS (Hardware) Flow Control
Automatic RTS hardware flow control is used to prevent data overrun to the local receiver FIFO. The RTS#
output is used to request remote unit to suspend/resume data transmission. The auto RTS flow control
features is enabled to fit specific application requirement (see Figure 9 ):
? Enable auto RTS flow control using EFR bit-6.
? The auto RTS function must be started by asserting RTS# output pin (MCR bit-1 to logic 1 after it is enabled).
If using the Auto RTS interrupt:
? Enable RTS interrupt through IER bit-6 (after setting EFR bit-4). The UART issues an interrupt when the
RTS# pin makes a transition from low to high: ISR bit-5 will be set to logic 1.
3.12
Auto RTS Hysteresis
With the Auto RTS function enabled, an interrupt is generated when the receive FIFO reaches the
programmed RX trigger level. The RTS# pin will not be forced HIGH (RTS off) until the receive FIFO reaches
the upper limit of the hysteresis level. The RTS# pin will return LOW after the RX FIFO is unloaded to the lower
limit of the hysteresis level. Under the above described conditions, the enhanced UART will continue to accept
data until the receive FIFO gets full. The Auto RTS function is initiated when the RTS# output pin is asserted
LOW (RTS On). Table 13 shows the complete details for the Auto RTS# Hysteresis levels. Please note that
this table is for programmable trigger levels only (Table D). The hysteresis values for Tables A-C are the next
higher and next lower trigger levels in the corresponding table.
15
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相关代理商/技术参数 |
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| XR18W750IL48TR-F | 功能描述:UART 接口集成电路 XR18W750IL48TR-F 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 |
| XR18W753 | 制造商:EXAR 制造商全称:EXAR 功能描述:SINGLE CHIP 868MHZ TO 956MHZ RF TRANSCEIVER |
| XR18W753IL48 | 制造商:EXAR 制造商全称:EXAR 功能描述:SINGLE CHIP 868MHZ TO 956MHZ RF TRANSCEIVER |
| XR18W753IL48-F | 功能描述:射频接收器 UART RoHS:否 制造商:Skyworks Solutions, Inc. 类型:GPS Receiver 封装 / 箱体:QFN-24 工作频率:4.092 MHz 工作电源电压:3.3 V 封装:Reel |
| XR18W753L48-0A-EB | 功能描述:界面开发工具 900MHz RF EVAL Board 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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