RFM65W Datasheet, PDF (44/71 Pages) List of Unclassifed Manufacturers – ISM RECEIVER MODULE

RFM65W
5.5. Packet Mode
5.5.1. General Description
In Packet mode the NRZ data from the demodulator is not directly accessed by the uC but stored in the FIFO and
accessed via the SPI interface.
In addition, the RFM65W packet handler performs several packet oriented tasks such as Preamble and Sync word check,
CRC check, dewhitening of data, Manchester decoding, address filtering, AES decryption, etc. This simplifies software and
reduces uC overhead by performing these repetitive tasks within the RF chip itself.
Another important feature is ability to empty the FIFO in Sleep/Stdby mode, ensuring optimum power consumption and
adding more flexibility for the software.
5.5.2. Packet Format
5.5.2.1. Fixed Length Packet Format
Fixed length packet format is selected when bit PacketFormat is set to 0 and PayloadLength is set to any value greater
than 0.
In applications where the packet length is fixed in advance, this mode of operation may be of interest to minimize RF
overhead (no length byte field is required). All nodes should be programmed with the same packet length value.
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