11.2.2 ACT Out-Of-Range Status

When Active Clock Tuning is enabled, module hardware uses the TUN bits to achieve high accuracy levels. If the module requires a TUN value outside of its range, the ACT Out-of-Range Status (ACTORS) bit is set by hardware (ACTORS = 1).

The ACTORS bit will be set when:
  • The HFINTOSC is tuned to its lowest frequency as determined by the TUN bits, and will require a value lower than the TUN bits can provide to achieve accuracy within ± 1%.
  • The HFINTOSC is tuned to its highest frequency as determined by the TUN bits, and will require a value higher than the TUN bits can provide to achieve accuracy within ± 1%.

When an ACT out-of-range event occurs, the HFINTOSC will continue to use the last TUN value until the HFINTOSC frequency returns to the tunable range. Once the HFINTOSC returns to the tunable range, module hardware clears the ACTORS bit.

Important: The ACTORS bit is read-only. Writes to ACTORS are ignored.