Transceiver Digital Control and Communications
MKW01xxRM Reference Manual, Rev. 3, 04/2016
7-10
Freescale Semiconductor, Inc.
Figure 7-9. Packet Mode Conceptual View
NOTE
The Bit Synchronizer is automatically enabled in Packet mode.
7.5.2
Packet Format
7.5.2.1
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, whether TX only, RX only, or TX/RX
should be programmed with the same packet length value.
The length of the payload is limited to 255 bytes if AES is not enabled else the message is limited to 64
bytes (i.e. max 65 bytes payload if Address byte is enabled).
The length programmed in
PayloadLength
relates only to the payload which includes the message and the
optional address byte. In this mode, the payload must contain at least one byte, i.e. address or message
byte.
An illustration of a fixed length packet is shown below. It contains the following fields:
•
Preamble (1010...)
•
Sync word (Network ID)
•
Optional Address byte (Node ID)
•
Message data
•
Optional 2-bytes CRC checksum
Содержание MKW01Z128
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