MRF39RA Datasheet, PDF (36/72 Pages) Microchip Technology – Low-Power, Integrated UHF Receiver

MRF39RA
4.5.2.3 Unlimited Length Packet Format
Unlimited length packet format is selected when bit
PacketFormat is set to ‘0’ and PayloadLength is set to
‘0’.
The user can receive packets of arbitrary length and
PayloadLength register is not used in Rx modes for
counting the length of the bytes received.
The data processing features such as address filtering,
Manchester decoding and data de-whitening are
unavailable if the sync pattern length is set to zero
(SyncOn = ‘0’). The CRC detection is also not
supported in this mode of the packet handler. Interrupts
such as CrcOk and PayloadReady are unavailable
either.
An unlimited length packet shown in Figure 4-11
contains the following fields:
• Preamble (1010...).
• Sync Word (Network ID).
• Optional Address Byte (Node ID).
• Message Data
FIGURE 4-11:
UNLIMITED LENGTH PACKET FORMAT
DC free Data decoding
Preamble
0 to 65535
bytes
Sync Word
0 to 8 bytes
Address
byte
Message
unlimited length
Payload
Fields processed and removed in Rx
Message part of the payload
Optional User provided fields which are part of the payload
DS40001778B-page 36
 2015 Microchip Technology Inc.