RF96 datasheet(69/121 Pages) HOPE

69 / 121 page

Page 69

RF96/97/98

Tel: +86-755-82973805

Fax: +86-755-82973550

E-mail: sales@hoperf.com http://www.hoperf.com

WIRELESS & SENSING

PRELIMINARY

DATASHEET

 Optional 2-bytes CRC checksum

Optional DC free data coding

CRC checksum calculation

Preamble

0 to 65536 bytes

Sync Word

0 to 8 bytes

Length

byte

Address

byte

Message

Up to 255 bytes

CRC

2-bytes

Payload

(min 2 bytes)

Fields added by the packet handler in Tx and processed and removed in Rx

Optional User provided fields which are part of the payload

Message part of the payload

Figure 34. Variable Length Packet Format

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

then transmit and receive packet of arbitrary length and PayloadLength register is not used in Tx/Rx modes for counting

the length of the bytes transmitted/received.

In Tx the data is transmitted depending on the TxStartCondition bit. On the Rx side the data processing features like

Address filtering, Manchester encoding and data whitening are not available if the sync pattern length is set to zero

(SyncOn = 0). The filling of the FIFO in this case can be controlled by the bit FifoFillCondition. The CRC detection in Rx is

also not supported in this mode of the packet handler, however CRC generation in Tx is operational. The interrupts like

CrcOk

& PayloadReady are not available either.

An unlimited length packet shown below is made up of the following fields:

 Preamble (1010...).

 Sync word (Network ID).

 Optional Address byte (Node ID).

 Message data

 Optional 2-bytes CRC checksum (Tx only)

DC free Data encoding

Preamble

0 to 65535

bytes

Sync Word

0 to 8

bytes

Address

byte

Message

unlimited length

Payload

Fields added by the packet handler in Tx and processed and removed in Rx

Message part of the payload

Optional User provided fields which are part of the payload

Figure 35. Unlimited Length Packet Format

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