LR1121
User Manual Rev 1.1
UM.LR1121.W.APP Mar 2023
20 of 130
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2.1.9 FS Mode
Frequency Synthesis (FS) mode is an intermediate mode between standby mode and the RX or TX modes, where the PLL
and the associated regulators are switched on. The BUSY signal goes low as soon as the PLL is locked.
2.1.9.1 SetFs
Command SetFs(...) sets the device in Frequency Synthesis mode.
2.2 Startup Sequence
At power-up or after a reset, the device initiates its startup phase.
• The BUSY signal is set to high, indicating that the device is busy and cannot accept a command.
• When the power management unit and RC oscillator become available, the embedded CPU starts and executes the
internal firmware.
• At the end of the startup sequence, the device is set in Standby RC mode, the BUSY signal goes low and the device
accepts commands.
Table 2-10: SetFsCommand
Byte 0 1
Data from Host 0x01 0x1D
Data to Host Stat1 Stat2
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