Errata nRF52832 - CLOCK: Calibration values are not correctly loaded from FICR at reset

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

It was inherited from the previous IC revision Engineering B.

Symptoms

RCOSC32KICALLENGTH is initialized with the wrong FICR value.

Always.

RCOSC32KICALLENGTH default value is wrong.

Execute the following code after reset:

 
 *(volatile uint32_t *)0x4000053C = ((*(volatile uint32_t *)0x10000244) & 0x0000E000) >> 13;

This code is already present in the latest system_nrf52.c file.