Texas Instruments SimpleLink CC2620 Technical Reference Manual page 1497

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23.3.3.1.5 CMD_FS: Frequency Synthesizer Controls Command
Command ID number: 0x0803
CMD_FS is a radio operation command. In addition to the parameters listed in
structure contains the fields listed in
frequency.
The frequency to use is given by frequency and fractFreq, and must be as close as possible to
(frequency + fractFreq / 65536) MHz.
If calibConf.bOverrideCalib is 1, precalibration is done as given in the command instead of using the
configured settings. In this case, the coarse, mid, and TDC calibration is performed only if the
corresponding bit in calibConf is 0 (see
given in coarsePrecal, midPrecal, or tdcPrecal, respectively, is used.
The synthesizer is set up in RX mode or TX mode, depending on synthConf.bTxMode. This mode may be
changed by radio operation commands when setting up RX or TX. If synthConf.refFreq is nonzero, a
reference frequency of 24 MHz/synthConf.refFreq is used instead of the default one.
If the synthesizer is programmed and reports loss of lock after having been in lock, the radio CPU raises
the Synth_No_Lock interrupt. The synthesizer keeps running, but the system CPU may use this
information to stop and restart the radio. The Synth_No_Lock is not raised more than once for each time
the synthesizer is programmed. The interrupt may also occur for commands with implicit-frequency
programming.
If the command is called with an illegal frequency or divider setting, the command ends with ERROR_PAR
as the status. If the command is called without the radio being configured, it ends with
ERROR_NO_SETUP as the status. If the command is called without the synthesizer being powered up, it
ends with ERROR_NO_FS as status.
Table 23-24. CMD_FS Command Format (please check the accuracy of this table)
Byte Index Field Name
14–15 frequency
16–17 fractFreq
18 synthConf
19
20 midPrecal
21 ktPrecal
22–23 tdcPrecal
23.3.3.1.6 CMD_FS_OFF: Turn Off Frequency Synthesizer
Command ID number: 0x0804
CMD_FS_OFF is a radio operation command that only takes the mandatory arguments listed in
Table 23-8, and turns off the frequency synthesizer if it has been started by CMD_FS or left on by a radio
operation command that does not turn off the synthesizer.
When the command is started, the synthesizer outputs are disabled and the state machine is reset. The
analog parts are still powered; CMD_FS_POWERDOWN (see
synthesizer to further reduce the current consumption.
SWCU117C – February 2015 – Revised September 2015
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Table 23-24, and can program the synthesizer to a specific
Table 23-24). If the calibration is skipped, the precalibration value
Bit Index Bit Field Name
0 bTxMode
1–5 refFreq
0–7 Reserved
Copyright © 2015, Texas Instruments Incorporated
Table
Type Description
The frequency in MHz to which the synthesizer
W
should be tuned
Fractional part of the frequency to which the
W
synthesizer should be tuned
0: Start synthesizer in RX mode.
W
1: Start synthesizer in TX mode.
CC13xx:
W 0: Use default reference frequency.
Others: Use reference frequency 24 MHz/refFreq.
Reserved
Mid precalibration value to use when
W
bOverrideCalib and bSkipMidCalib are both 1.
KT precalibration value to use when
W
bOverrideCalib and bSkipTdcCalib are both 1.
TDC precalibration value to use when
W
bOverrideCalib and bSkipTdcCalib are both 1.
Section 23.3.3.1.4) can power down the
RF Core HAL
23-8, the command
1497
Radio