nrf5340

[137] CLOCK: LFRC calibration is not performed

This anomaly applies to Revision 1, build codes CLAA-D00, QKAA-D00.

Domains

Application, Network

Symptoms

The DONE event is missing, and the LFRC clock frequency might be incorrect.

Conditions

The LFRC is used with calibration, and one of the following conditions occurs:
  • The other CPU is requesting a higher priority source (LFSYNTH or LFXO) during the calibration.
  • The user is switching from a higher priority clock source shortly before starting the calibration.

Consequences

The LFRC calibration might not occur, which results in the LFRC not meeting the specified frequency tolerance after calibration.

Workaround

Repeat the calibration every 1 ms until the DONE event is generated.

Parent topic: New and inherited anomalies