Texas Instruments SimpleLink CC2620 Technical Reference Manual page 1512

RF Core HAL
23.3.4.17 CMD_UPDATE_FS: Set New Synthesizer Frequency Without Recalibration
Command ID number: 0x0011
CMD_UPDATE_FS is an immediate command that takes the parameters listed in
Byte Index Field Name
0–1 commandNo
2–13
14–15 frequency
16–17 fractFreq
On reception, the radio CPU programs a new frequency in the synthesizer without restarting calibration.
This must be a small change compared to the frequency used under calibration, otherwise the synthesizer
is most likely unable to relock. Extra distortion may occur if the command is done during RX or TX.
The frequency to use is given by frequency and fractFreq, and the frequency must be as close as possible
to (frequency + fractFreq / 65536) MHz.
If the synthesizer is not running and the calibration is done, the radio CPU returns ContextError in
CMDSTA. If frequency is invalid, the radio CPU returns ParError in CMDSTA. Otherwise, the radio CPU
returns Done in CMDSTA when the update is complete.
1512
Radio
Table 23-48. CMD_UPDATE_FS Command Format
Bits Bit Field Name
Copyright © 2015, Texas Instruments Incorporated
Table
Type Description
W The command ID number
Reserved
W The frequency in MHz to tune to
Fractional part of the frequency to
W
tune to
SWCU117C – February 2015 – Revised September 2015
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23-48.