Kernel Power Management (Windows Embedded CE 6.0)

1/6/2010

The kernel operates in one of several power states and transitions between them when a trigger event occurs.

The following illustration shows the power states and transitions.

The following table describes the transitions between power states for a Windows Embedded CE–based target device.

Transition	Description
Power-on reset	Target device clears working RAM and initializes the file system.
Cold boot	First application of power, for example, when a backup battery is installed.
Warm boot	Transition from the On power state. A warm boot clears the working RAM.
On-to-Idle	Transition from a fully running state to a state in which the microprocessor is using little power.
Idle-to-On	Transition of the microprocessor from low-power to full-power operation.
On-to-Suspend	Transition to a stopped microprocessor, as a result of certain events.
Suspend-to-On	Transition of a stopped microprocessor to full-power operation based on specific wake-up events.
On-to-Critical off	Transition when critically low battery power is detected. You must implement the function for transitioning to the Critical Off state for your device.

For more information about kernel power management, see the following topics:

• How to Add Power Management to an OS Design

• Power State Transitions

• Critical-to-Off Interrupt Implementation

• Power Management Wake Sources

• Power Management Performance Considerations

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See Also

Concepts

Kernel Overview
Power State Transitions
Critical-to-Off Interrupt Implementation

Other Resources

Kernel