Edit: removed previous post. The increment happens as fast as the clock allows, which means any reasonable rate is much more than the cycle time. It delays 250

Edit: removed previous post. The increment happens as fast as the clock allows, which means any reasonable rate is much more than the cycle time. It delays 250us once it hears a click. I'm not quite sure why we bother with resetting the counter to 0 when it hears a click though.