Data Sheet

Page 102
RFM95/96/97/98(W)
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WIRELESS & SENSING PRELIMINARY DATASHEET
6.4. LoRa
TM
Mode Register Map
This section details the RFM95/96/97/98(W) register mapping and the precise contents of each register in LoRa
TM
mode.
It is essential to understand that the LoRa modem is controlled independently of the FSK modem. Therefore, care should
be taken when accessing the registers, especially as some register may have the same name in LoRa or FSK mode.
The LoRa registers are only accessible when the device is set in Lora mode (and, in the same way, the FSK register are
only accessible in FSK mode). However, in some cases, it may be necessary to access some of the FSK register while in
LoRa mode. To this aim, the AccesSharedReg bit was created in the RegOpMode register. This bit, when set to ‘1’, will
grant access to the FSK register 0x0D up to the register 0x3F. Once the setup has been done, it is strongly recommended
to clear this bit so that LoRa register can be accessed normally.
Convention: r: read, w: write, c : set to clear and t: trigger.
Name
(Address)
Bits
Variable Name
Mode Reset
LoRa
TM
Description
RegFifo
(0x00)
7-0 Fifo rw 0x00
LoRa
TM
base-band FIFO data input/output. FIFO is cleared an
not accessible when device is in SLEEP mode
Common Register Settings
7 LongRangeMode rw 0x0
0 Æ FSK/OOK Mode
1 Æ LoRa
TM
Mode
This bit can be modified only in Sleep mode. A write operation on
other device modes is ignored.
6 AccessSharedReg rw 0x0
This bit operates when device is in Lora mode; if set it allows
access to FSK registers page located in address space
(0x0D:0x3F) while in LoRa mode
0 Æ Access LoRa registers page 0x0D: 0x3F
1 Æ Access FSK registers page (in mode LoRa) 0x0D: 0x3F
5-4 reserved r 0x00 reserved
3 LowFrequencyModeOn rw 0x01
Access Low Frequency Mode registers
0 Æ High Frequency Mode (access to HF test registers)
1 Æ Low Frequency Mode (access to LF test registers)
RegOpMode
(0x01)
2-0 Mode rwt 0x01
Device modes
000 Æ SLEEP
001 Æ STDBY
010 Æ Frequency synthesis TX (FSTX)
011 Æ Transmit (TX)
100 Æ Frequency synthesis RX (FSRX)
101 Æ Receive continuous (RXCONTINUOUS)
110 Æ receive single (RXSINGLE)
111 Æ Channel activity detection (CAD)
(0x02) 7-0 reserved r 0x00 -
(0x03) 7-0 reserved r 0x00 -
(0x04) 7-0 reserved rw 0x00 -
(0x05) 7-0 reserved r 0x00 -
RegFrMsb
(0x06)
7-0 Frf(23:16) rw 0x6c MSB of RF carrier frequency
RegFrMid
(0x07)
7-0 Frf(15:8) rw 0x80 MSB of RF carrier frequency