RF65 datasheet(44/72 Pages) ETC2

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RF65

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ADVANCED COMMUNICATIONS & SENSING

DATASHEET

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 RF65 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.

CONTROL

DIO0

DIO1

DIO2

DIO3

DIO4

DIO5

Data

SYNC

RECOG.

PACKET

HANDLER

FIFO

(+SR)

SPI

NSS

SCK

MOSI

MISO

Figure 27. Packet Mode Conceptual View

Note

The Bit Synchronizer is automatically enabled in Packet mode.

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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