An event user is a peripheral module that can make use of an event to trigger an action, referred to as an event action. An event user selects the event source to react to by selecting an event channel. The actual event source is determined by the multiplexer setting in the selected event channel. There are ten asynchronous user channels and two synchronous user channels, corresponding to register ASYNCUSERn and SYNCUSERn (n refers to the channel number).