# ACT Lock Status

The Active Clock Tuning Lock Status (ACTLOCK) bit can be used to determine when the HFINTOSC has been tuned. When ACTLOCK is set (ACTLOCK = 1), the HFINTOSC frequency has been locked to within ± 1% of the nominal frequency. When ACTLOCK is clear (ACTLOCK = 0), the following conditions may be true:
• The HFINTOSC frequency has not been locked to within ± 1%
• A device Reset occurred
• The ACT feature is disabled
Important: The ACTLOCK bit is read-only. Writes to ACTLOCK are ignored.