User Interface
2-11
2
System Defaults and Initial Conditions
Power States
There are five power states:
•
ON
•
DOZE
•
SLEEP
•
SUSPEND
•
OFF
SUSPEND and OFF are mutually exclusive and can be set by the developer or
the user. The
L
key can be used at any time in the ON, DOZE or SLEEP state to
enter either SUSPEND or OFF, depending on which is selected, and pressing
the
L
key when in SUSPEND or OFF enters the ON state.
The figure on the next page is a state diagram for the automatic power saving
functions.
Automatic states are reached sequentially on a decreasing power consumption
curve from the first state, ON (CPU at full speed, all systems powered up). The
second state is DOZE (CPU slows to 25% of normal speed). The third state is
SLEEP, (backlight shuts off). The last state is SUSPEND/OFF (everything
powered down, except RTC; if SUSPEND is set, power is retained for RAM).
Note: If any one of the powered-down states time parameters are set to zero, it has the
effect of canceling that particular state as an option and all the other states below it.
That is, if SLEEP is set to zero, the unit will never get to the SUSPEND state, the
backlight will never shut off and there won’t be any auto timeout, and if DOZE is set
to 0, NO power management occurs.
Activities are defined as keypress, disk access, serial communications and the
default video access.
DOZE times can be set in 1/8 second increments, up to 2 seconds, then in one
second increments up to 14 seconds. SLEEP and SUSPEND/OFF can be set
from 0 to 15 minutes.
Current defaults from the factory are:
To enter DOZE from ON:
1/2 second
To enter SLEEP from DOZE:
1 minute
To enter SUSPEND/OFF from SLEEP:
1 minute
Содержание Trakker T2090
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