The Timer-APB core is a 32-bit counter/timer with an APB interface that can be used to schedule periodic tasks, and can act as a high precision time reference.
The timer supports three modes of operation: One-shot, auto-restart and continuous. In one-shot mode the counter runs until it reaches a user-defined value and it is then automatically disabled. In auto-restart mode the counter will reset itself and continue counting after reaching a user-defined value. In continuous mode, the counter is free-running and no special action is taken by the core.