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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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RF96 датащи(PDF) 69 Page - HOPE Microelectronics CO., Ltd. |
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RF96 датащи(HTML) 69 Page - HOPE Microelectronics CO., Ltd. |
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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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