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*Controlling the [[watchdog timer]]<ref name="amikey"/>
As a core system component, the embedded controller is always on when power is supplied to the mainboard. To communicate with the main computer system, several forms of communication can be used, including [[Advanced Configuration and Power Interface|ACPI]], [[SMBus]], or [[Shared memory (interprocess communication)|shared memory]].
The embedded controller has its own [[Random-access memory|RAM]], independent of that used by the main computer system, and almost always its own [[flash ROM]] on which the controller's [[software]] is stored. Many BIOS updates also include upgrades for the embedded controller firmware.
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