is not being actively used, in order to maintain a usable battery life.

Asynchronous sequential logic

Asynchronous (clockless or self-timed) sequential logic is not synchronized by a clock signal; the outputs of the circuit change directly in response to changes in inputs. The advantage of asynchronous logic is that it can be faster than synchronous logic, because the circuit doesn't have to wait for a clock signal to process inputs. The speed of the device is potentially limited only by the propagation delays

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