Calibration logic of OTTO (HRPWM) can be used to detect incorrect system clock (SYSCLK) frequencies. The clock whose frequency needs to be measured is configured as the system clock and the auto-calibration function is executed. The result obtained from the calibration function can be checked against the predetermined range of value to detect incorrect clock frequency or frequency drift. Error response, diagnostic testability, and any necessary software requirements are defined by the software implemented by the system integrator.