Operating system and control method

An operating system including a first storage circuit, a second storage circuit, a selection circuit, a core circuit, and a trigger-source management circuit is provided. The first storage circuit stores a first control parameter. The second storage circuit stores a second control parameter. When a first trigger source enables a first trigger signal, the trigger-source management circuit directs the selection circuit to serve the first control parameter as an output parameter such that the core circuit enters a first mode to perform a first operation. When a second trigger source enables a second trigger signal, the trigger-source management circuit directs the selection circuit to serve the second control parameter the output parameter such that the core circuit enters a second mode to perform a second operation.