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RFM96 Datasheet(PDF) 29 Page - HOPE Microelectronics CO., Ltd. |
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RFM96 Datasheet(HTML) 29 Page - HOPE Microelectronics CO., Ltd. |
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29 / 121 page  Page 29 RFM95/96/97/98(W) Tel: + 86-755-82973805 Fax: + 86-755-82973550 E-mail: sales@hoperf.com http:/ / www.hoperf.com WIRELESS & SENSING PRELIMINARY DATASHEET 4.1.2. LoRa TM Digital Interface The LoRaTM modem comprises three types of digital interface, static configuration registers, status registers and a FIFO data buffer. All are accessed through the RFM95/96/97/98(W)’s SPI interface - full details of each type of register are given below. Full listings of the register addresses used for SPI access are given in Section 6.4. 4.1.2.1. LoRa TM Configuration Registers Configuration registers are accessed through the SPI interface. Registers are readable in all device mode including Sleep. However, they should be written only in Sleep and Stand-by modes. Please note that the automatic top level sequencer (TLS modes) are not available in LoRa TM mode and the configuration register mapping changes as shown in Table 85. The content of the LoRaTM configuration registers is retained in FSK/OOK mode. For the functionality of mode registers common to both FSK/OOK and LoRaTM mode, please consult the Analog and RF Front End section of this document (Section 5). 4.1.2.2. Status Registers Status registers provide status information during receiver operation. 4.1.2.3. LoRa TM Mode FIFO Data Buffer Overview The RFM95/96/97/98(W) is equipped with a 256 byte RAM data buffer which is uniquely accessible in LoRa mode. This RAM area, thereafter reffered to as the FIFO Data buffer, is fully customizable by the user and allows access to the received, or to be transmitted, data. All access to the LoRaTM FIFO data buffer is done via the SPI interface. A diagram of the user defined memory mapping of the FIFO data buffer is shown below. These FIFO data buffer can be read in all operating modes except sleep and store data related to the last receive operation performed. It is automatically cleared of old content upon each new transition to receive mode. Figure 7. LoRa TM data buffer |
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