MRF39RA datasheet(36/72 Pages) MICROCHIP

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MRF39RA

DS40001778B-page 36

 2015 Microchip Technology Inc.

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

Message

unlimited length

Address

byte

Sync Word

0 to 8 bytes

Preamble

0 to 65535

bytes

Payload

Fields processed and removed in Rx

Optional User provided fields which are part of the payload

Message part of the payload

DC free Data decoding

MRF39RA Datasheet(PDF) 36 Page - Microchip Technology