Transceiver Digital Control and Communications
MKW01xxRM Reference Manual, Rev. 3, 04/2016
7-18
Freescale Semiconductor, Inc.
Figure 7-14. Manchester Encoding/Decoding
7.5.8.2
Data Whitening
Another technique called whitening or scrambling is widely used for randomizing the user data before
radio transmission. The data is whitened using a random sequence on the TX side and de-whitened on the
RX side using the same sequence. Comparing to Manchester technique it has the advantage of keeping
NRZ data rate i.e. actual bit rate is not halved.
The whitening/de-whitening process is enabled if
DcFree = 10
. A 9-bit LFSR is used to generate a random
sequence. The payload and 2-byte CRC checksum is then XORed with this random sequence as shown
below. The data is de-whitened on the receiver side by XORing with the same random sequence.
Payload whitening/de-whitening is thus made transparent for the user, who still provides/retrieves NRZ
data to/from the FIFO.
Figure 7-15. Data Whitening
7.6
Register Summary
Table 7-4. Registers Summary
Address
Register Name
Reset
(built-in)
Default
(recomme
nded)
Description
0x00
RegFifo
0x00
FIFO read/write access
0x01
RegOpMode
0x04
Operating modes of the transceiver
0x02
RegDataModul
0x00
Data operation mode and Modulation settings
0x03
RegBitrateMsb
0x1A
Bit Rate setting, Most Significant Bits
0x04
RegBitrateLsb
0x0B
Bit Rate setting, Least Significant Bits
Содержание MKW01Z128
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