23.7.1.5 Free Running Mode

Free Running Mode causes the FREQM to automatically start a new measurement after each measurement is complete. The Free Running Mode can be disabled by disabling the module, or by setting the Software Reset bit in the Control A register (CTRLA.SWRST = 1).

Important: In free running mode, when a new measurement starts, the VALUE register will follow the MSR counter value. It is not recommended to read the VALUE register when the free running operating mode is enabled.
Note:
  1. In free running mode, the event detection is disabled. As consequence, all incoming events are ignored and no actions will be triggered inside the FREQM module.
  2. Writing to CTRLB.START when a measurement is in progress is ignored. The bit is always read zero.