Table of Contents
Advertisement
4.6. Controlling the Backlight with the Backlight Control Function
The backlight function can be controlled using the BHT_SetBltStatus function.
The BHT_SetBltStatus (BHT_BL_ENABLE_ON) function is used to enable the backlight function and turn
the backlight ON.
The backlight power saving mode is enabled if no keys are pressed, or the touch panel tapped from the
point the backlight is turned ON using the BHT_SetBltStatus (BHT_BL_ENABLE_ON) function until the
time set using the BHT_SetSysSettingDW
(BHT_BACKLIGHT_BATT_TIME/BHT_BACKLIGHT_AC_TIME,...) function (Default: 3 seconds when
powered by battery, 60 seconds when placed on CU) elapses, or if the BHT_SetBltStatus
(BHT_BL_ENABLE_OFF) function is executed. (The backlight function remains ON at this time.)
If the BHT_SetBltStatus (BHT_BL_DISABLE) function is executed, the backlight function is disabled, and
the backlight power saving mode is enabled.
Backlight control is performed as shown in the flow diagram below.
BHT_SetBltStatus
(BHT_BL_ENABLE_OFF)
Perform one of the following:
• BHT_SetBltStatus (BHT_BL_ENABLE_ON)
(*5)
• Press a key other (*3) than the backlight control
key. (*1)
• Tap the touch panel. (*4)
(*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 screen tap has not been set for the key backlight illumination trigger, the key backlight will not illuminate
even if the screen is tapped. If, however, the key backlight is already illuminated beforehand, it will not turn
OFF by tapping the screen.
(1) Backlight power saving mode
(backlight function ON)
(2) Backlight ON
BHT_SetBltStatus
(BHT_BL_DISABLE)
(3) Backlight power saving mode
(backlight function OFF)
)
function. Power saving mode is enabled if no key other than the
BHT_SetBltStatus
(BHT_BL_DISABLE)
BHT_SetBltStatus (BHT_BL_ENABLE_OFF)
Furthermore, 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.
BHT_SetBltStatus
(BHT_BL_ENABLE_ON) (*5)
8
)
function.
Advertisement
Table of Contents
