收藏本站
MRF89XA
3.10
Buffered Mode
3.10.1
TX PROCESSING
In Buffered mode operation the NRZ data to/from the
modulator or demodulator is not accessed by the host
microcontroller but is stored in the FIFO and accessed
via the SPI data interface. This frees the host
microcontroller for other tasks between processing
data from the MRF89XA. In addition, it simplifies
software development overhead and reduces
microcontroller performance requirements (i.e., speed,
response). Note that in this mode the packet handler
stays inactive. The interface for Buffer mode is shown
in Figure 3-21 .
An important feature is also the ability to empty the
FIFO in Stand-by mode, ensuring low-power
consumption and adding greater software flexibility.
After entering TX in Buffered mode, the MRF89XA
expects the host microcontroller to write to the FIFO,
through the SPI data interface, and all the data bytes to
be transmitted (preamble, Sync word, payload).
Actual transmission of the first byte will start either
when the FIFO is not empty (that is, first byte written by
the host microcontroller) or when the FIFO is full
depending on the IRQ0TXST bit (FTPRIREG<4>) set-
ting.
In Buffered mode the packet length is not limited, as
long as there are bytes inside the FIFO to be sent. When
the last byte is transferred to the SR, the FIFOEMPTY
IRQ source is issued to interrupt the host
microcontroller, when the FIFO can still be filled with
Note:
In this case Bit Synchronizer is automati-
cally enabled in Buffered mode. The Sync
word recognition must be enabled
(SYNCREN = 1 ) independently of the
FIFO filling method selected (FIFOFM).
additional bytes if required.
When the last bit of the last byte has left the Shift
Register (SR) (i.e, eight bit periods later), the TXDONE
interrupt source is issued and the user can exit TX
mode after waiting at least one bit period from the last
bit processed by the modulator. If the transmitter is
switched OFF during transmission (for example,
entering another chip mode), it will stop immediately,
even if there is still unsent data.
FIGURE 3-21:
BUFFERED MODE BLOCK DIAGRAM
MRF89XA
Control
IRQ0
IRQ1
Data
RX
TX
SYNC
Recognition
FIFO
(+SR)
SPI
CONFIG
DATA
CSCON
CSDAT
SCK
SDI
SDO
Datapath
? 2010–2011 Microchip Technology Inc.
Preliminary
DS70622C-page 77
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
MRF89XAM9A-I/RM IC TXRX MOD 915MHZ ULP SUB-GHZ
MRX-001-433DR-B MODULE RECEIVER 433MHZ 18DIP
MRX-002-433DR-B MODULE RECEIVER 433MHZ 18DIP
MRX-002SL-433DR-B MODULE RCVR 433MHZ SAW LN 24DIP
MRX-005-915DR-B MODULE RECEIVER 915MHZ 18DIP
MRX-005SL-915DR-B MODULE RCVR 915MHZ SAW LN 24DIP
MRX-007-433DR-B MODULE RECEIVER 433MHZ 18DIP
MRX-008-433DR-B MODULE RECEIVER 433MHZ 18DIP
相关代理商/技术参数
MRF89XAM8A-I 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Ultra Low-Power, Integrated ISM Band Sub-GHz Transceiver
MRF89XAM8A-I/RM 功能描述:射频模块 868MHz Sub-GHz transceiver module RoHS:否 制造商:Linx Technologies 产品:Transceiver Modules 频带:902 MHz to 928 MHz 输出功率:- 15.5 dBm to + 12.5 dBm 接口类型:UART 工作电源电压:- 0.3 VDC to + 5.5 VDC 传输供电电流:38.1 mA 接收供电电流:22.7 mA 天线连接器类型:U.FL 最大工作温度:+ 85 C 尺寸:1.15 mm x 0.63 mm x 0.131 mm
MRF89XAM8A-I/RM 制造商:Microchip Technology Inc 功能描述:, Leaded Process Compatible:Yes, Peak Re
MRF89XAM9A_12 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:915 MHz Ultra Low-Power Sub-GHz Transceiver Module
MRF89XAM9A-I/RM 功能描述:射频模块 915MHz Sub-GHz Transceiver Mod RoHS:否 制造商:Linx Technologies 产品:Transceiver Modules 频带:902 MHz to 928 MHz 输出功率:- 15.5 dBm to + 12.5 dBm 接口类型:UART 工作电源电压:- 0.3 VDC to + 5.5 VDC 传输供电电流:38.1 mA 接收供电电流:22.7 mA 天线连接器类型:U.FL 最大工作温度:+ 85 C 尺寸:1.15 mm x 0.63 mm x 0.131 mm
MRF89XAM9AT-I/RM 制造商:Microchip Technology Inc 功能描述:915 MHz Ultra Low-Power Sub-GHz Transceiver Module
MRF89XAT-I/MQ 功能描述:射频收发器 868/915/950 MHz Sub-GHz transceiver RoHS:否 制造商:Atmel 频率范围:2322 MHz to 2527 MHz 最大数据速率:2000 Kbps 调制格式:OQPSK 输出功率:4 dBm 类型: 工作电源电压:1.8 V to 3.6 V 最大工作温度:+ 85 C 接口类型:SPI 封装 / 箱体:QFN-32 封装:Tray
MRF8HP21080HR3 功能描述:射频MOSFET电源晶体管 HV8 2.1GHZ 160W NI780H-4 RoHS:否 制造商:Freescale Semiconductor 配置:Single 晶体管极性: 频率:1800 MHz to 2000 MHz 增益:27 dB 输出功率:100 W 汲极/源极击穿电压: 漏极连续电流: 闸/源击穿电压: 最大工作温度: 封装 / 箱体:NI-780-4 封装:Tray