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4.5. Controlling the Backlight with the Backlight Control Key
The backlight function can be enabled/disabled by pressing the backlight function control key (Default:
Hold down [SF] key and press [M3].).
The illumination time is specified using the BHT_SetSysSettingDW
(BHT_BACKLIGHT_BATT_TIME/BHT_BACKLIGHT_AC_TIME, ...) function. The default value is 3
seconds when powered by the battery, and 60 seconds when placed on the CU. Backlight control is
performed as shown in the flow diagram below.
Press a key other (*3) than the backlight
control key. (*1)
Or alternatively tap the touch panel. (*4)
Press the backlight control key. (*1)
(*1)
Hold down [SF] key and press [M3].
Default:
Setting is possible using the BHT_SetSysSettingDW (BHT_BACKLIGHT_KEY,...
(*2)
The backlight illumination time is set using the BHT_SetSysSettingDW (BHT_BACKLIGHT_BATT_TIME/
BHT_BACKLIGHT_AC_TIME,...
backlight control key is pressed, or if the touch panel is not tapped within this time.
This time is measured from the point all keys are released or the touch panel is last pressed.
(*3)
If key-press has not been set for the key backlight illumination trigger, the key backlight will not illuminate
even if a key is pressed. If, however, the key backlight is already illuminated beforehand, it will not turn
OFF by pressing a key.
(*4)
If touch panel tap has not been set for the key backlight illumination trigger, the key backlight will not
illuminate even if the touch panel is tapped. If, however, the key backlight is already illuminated
beforehand, it will not turn OFF by tapping the touch panel.
(*5)
Cold booting is performed from the status at (1) above.
However, cold booting is performed from the status at (1) when the registry is saved with the status at (1)
or (2), and is performed from the status at (3) when the registry is saved with the status at (3).
(*6)
When performing warm booting or when resuming from the suspend status, the process is performed from
(1) if the status prior to warm boot/suspend is (1) or (2), and is performed from (3) if the status prior to
warm boot/suspend is (3).
(1) Backlight power saving mode
(backlight function ON)
(2) Backlight ON
(3) Backlight power saving mode
(backlight function OFF)
)
function. Power saving mode is enabled if no key other than the
7
Press the backlight control key. (*1)
No key other than the backlight control key (*1) is
pressed and the touch panel is not tapped prior to
the backlight illumination time (*2) elapsing.
Press the backlight contr
)
function.
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