RFM95 Datasheet, PDF (60/121 Pages) List of Unclassifed Manufacturers – Low Power Long Range Transceiver Module

WIRELESS & SENSING
RFM95/96/97/98(W)
PRELIMINARY
DATASHEET
4.2.9. Data Processing in FSK/OOK Mode
4.2.9.1. Block Diagram
Figure below illustrates the RFM95/96/97/98(W) data processing circuit. Its role is to interface the data to/from the
modulator/demodulator and the uC access points (SPI and DIO pins). It also controls all the configuration registers.
The circuit contains several control blocks which are described in the following paragraphs.
Tx/Rx
CONTROL
Data
Rx _SYNC
RECOG.
Tx
PACKET
HANDLER
FIFO
(+SR)
DIO0
DIO1
DIO2
DIO3
DIO4
DIO5
SPI
NSS
SCK
MOSI
MISO
Potential datapaths (data operation mode dependant)
Figure 25. RFM95/96/97/98(W) Data Processing Conceptual View
The RFM95/96/97/98(W) implements several data operation modes, each with their own data path through the data
processing section. Depending on the data operation mode selected, some control blocks are active whilst others remain
disabled.
4.2.9.2. Data Operation Modes
The RFM95/96/97/98(W) has two different data operation modes selectable by the user:
Š Continuous mode: each bit transmitted or received is accessed in real time at the DIO2/DATA pin. This mode may be
used if adequate external signal processing is available.
Š Packet mode (recommended): user only provides/retrieves payload bytes to/from the FIFO. The packet is automatically
built with preamble, Sync word, and optional CRC and DC-free encoding schemes The reverse operation is performed
in reception. The uC processing overhead is hence significantly reduced compared to Continuous mode. Depending on
the optional features activated (CRC, etc) the maximum payload length is limited to 255, 2047 bytes or unlimited.
Each of these data operation modes is fully described in the following sections.
Tel: [phone] Fax: [phone] E-mail: [e-mail] http:/ / www.hoperf.com
Page 60