Allows tuning the output frequency from the target frequency or towards the target
due to the oscillator drift. The number is in 2’s complement format. The nominal
value is ‘0’, indicating no correction from the factory-calibrated
tuning.
When auto-tune is enabled, the OSCHFTUNE
register is locked and will be updated with the latest auto-tune result only after
auto-tune is disabled. If the user tries to write to the OSCHFTUNE register while
auto-tune is enabled, a Peripheral Access Error is asserted (see the PAC -
Peripheral Access Controller chapter for details). Writes to this register are
allowed only if auto-tune is disabled (OSCHFCTRL.AUTOTUNE = ‘0’).
Note that the OSCHFCTRL register is write protected (Local Write-Protection).
