Silicon Laboratories EFR32xG14 Wireless Gecko Reference Manual page 288

11.3.2.1.5 AUXHFRCO
The AUXHFRCO can be enabled and disabled by software via the CMU_OSCENCMD register. The AUXHFRCO is disabled automati-
cally when entering EM2, EM3, or EM4. Hardware based AUXHFRCO enabling and disabling is however performed by the ADC mod-
ule when AUXCLK is selected for its operation and by the LESENSE module making it available even when being in EM2/EM3.
The supported AUXHFRCO frequency range is from 1 MHz to 38 MHz. The default AUXHFRCO frequency is 19 MHz
After enabling the AUXHFRCO, it should not be disabled before it has been signaled to be enabled. Similarly, after disabling the
AUXHFRCO, it should not be re-enabled before it has been signaled to be non-enabled. Typical enable and disable sequences are as
follows:
CMU->OSCENCMD = CMU_OSCENCMD_AUXHFRCOEN;
while ((CMU->STATUS & CMU_STATUS_AUXHFRCOENS) != CMU_STATUS_AUXHFRCOENS);
CMU->OSCENCMD = CMU_OSCENCMD_AUXHFRCODIS;
while ((CMU->STATUS & CMU_STATUS_AUXHFRCOENS) == CMU_STATUS_AUXHFRCOENS);
Note:
When using AUXHFRCO as the debug trace clock (as selected in CMU_DBGCLKSEL), it must be stopped before entering EM2 or
EM3.
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