A channel can be event monitored by configuring limit register CH[n].LIMIT.
If the conversion result is higher than the defined high limit, or lower than the defined low limit, the appropriate event will get fired.
The CH[n].LIMIT.HIGH shall always be higher than or equal to CH[n].LIMIT.LOW . In other words, an event can be generated only when the input signal has been sampled outside of the defined limits. It is not possible to generate an event when the input signal is inside a defined range by swapping high and low limits.
The comparison to limits always takes place, there is no need to enable it. If comparison is not required on a channel, the software shall simply ignore the related events. In that situation, the value of the limits registers is irrelevant, so it does not matter if CH[n].LIMIT.LOW is lower than CH[n].LIMIT.HIGH or not.