Power management

This callout is specific to the CPU and target. The CPU has the following general power modes:

Active or Running

The system is actively running applications. Some peripherals or devices may be idle or shut down.

Idle

The system isn't running applications; the CPU is halted. Code is all or partially resident in memory.

Standby

The system isn't running applications; the CPU is halted. Code isn't resident in memory.

Shutdown

Minimal or zero-power state. CPU, memory, and devices are all powered off.

These definitions are a guideline only; you can define multiple subsets for each state (e.g., Idle1, Idle2, etc.). Furthermore, not all these CPU power modes may be required or even possible for a specific board or CPU.