Timeout Check Mode

In this mode, the counter counts to MAX and wraps around. On the first edge the counter is restarted and on the second edge the counter is stopped. If the count register (TCB.CNT) reaches TOP before the second edge, an interrupt will be generated. In freeze state, the counter will restart on a new edge. Reading count (TCB.CNT) or compare/capture (TCB.CCMP) register, or writing run bit (RUN in TCB.STATUS) in freeze state will have no effect.
Figure 1. Timeout Check Mode