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# 1.2.11 Time System Service

The Timer System Service Library is capable of providing periodic or one-shot alarm and delays to the user. It uses a hardware timer peripheral library for providing it's timing services.

Key Features:

- Periodic notifications

- One-shot/single notification

- Delays

- Support for both tick-based and tickless modes

  - Tick-less mode: Instead of getting interrupted from the hardware timer periodically, the Time System Service manages the hardware timer so as to generate an interrupt only when required and at appropriate times.

  - Tick-based mode: A periodic interrupt is generated by the hardware timer. The tick-rate is configurable by the user and defines the resolution for all the timers.