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22
MW-520 Application Developer's Guide
Power Management
APM 1.2 System State Machine
The APM 1.2 System State Machine defines the states of all components in the
system.
Windows
Idle
Resume
CPU Idle
Timer or
Suspend key
Suspend
Figure 6
System State Machine
The machine contains three states: On, CPU Idle, and Suspend. All local Standby
modes are canceled.
Table 11
State Definitions
Phoenix
On
CPU idle
Suspend (to RAM)
Suspend (to Disk)
On
Activity
(IRQ)
Functionality
All devices on, full clock
All devices On, reduced clock
Display and Disk power down
Stop Clock, DRAM refresh mode
Memory contents written to disk; power off
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