[33] CLOCK: LFRC frequency starts drifting even if calibration task is triggered

This anomaly applies to IC Rev. Engineering A, build codes QKAA-AB0.

Domains

Application

Symptoms

LFRC frequency starts drifting even if calibration task is triggered.

Conditions

If any of following takes place:
  • Triggering LFCLKSTOP task during calibration
  • Changing LFCLK source from LFRC to any other source during calibration
  • Starting calibration before LFRC is started

Consequences

LFRC frequency drifts. WDT and RTC may stop working even after soft reset.

Workaround

Avoiding conditions that cause this anomaly. If the anomaly is triggered, do a pin reset, System OFF reset, application watchdog reset, or power cycle.