[192] CLOCK: LFRC frequency offset after calibration

This anomaly applies to IC Rev. Engineering C, build codes CIAA-BA0, QFAA-BB0.


LFRC oscillator frequency is wrong after calibration, exceeding 500 ppm.


On some devices, when entering System ON Idle while calibration is ongoing.


After calibration, LFRC has a frequency offset that is outside specification.


Apply the following code before starting the RCOSC32K calibration:

*(volatile uint32_t *)0x40000C34 = 0x00000002; 
Apply the following code after the RCOSC32K calibration is finished:

*(volatile uint32_t *)0x40000C34 = 0x00000000;
This workaround is included in SDK v15.0.0 and SoftDevices S140, S132, and S112 v6.0.0.