19
System Power States
The OS (Operating System) has
4 different power states
as for the internal power manager
state machine. The state transition reflects on the system conditions as stated below:
a)
User activities
b)
System activities
c)
Application requests
d)
Timers
The four states are:
On
- In this state, the device is active and user can use all the different peripherals,
and consequently the battery consumption is on maximum level.
User Idle
- When the user is not using the device actively, the display backlight
intensity will decrease and the unused peripherals will be disabled to reduce power
consumption.
System Idle
-When the system is inactive, the power manager switches to this state.
Suspend
– In this state, the device will consume minimal power. Therefore, the device
can’t be used. The processor clock will be weak and the peripherals will be turned off
automatically.
The transition from
On
to
User Idle
and
User Idle
to
Suspend
is done once the timer
expires. The timer value can be set through the power applet in the control panel.
Display
The resolution for the device is 640x480 pixels.
To customize the display screen, go to
->
Settings
->
Control Panel
->
Display
Properties
.
Summary of Contents for ST5e
Page 1: ...0 ST5e Version 3 0 ...
Page 4: ...3 FRONT Knowing Your Device Power Button ...
Page 5: ...4 TOP BOTTOM REAR SIDE ...
