Specifications

Chapter 4. Backlight Control
4.1. Outline
The backlight illumination and power saving modes can be controlled using either of the following
methods.
(1) The backlight can be controlled by pressing the backlight control key.
(2) The backlight can be controlled using the backlight control function (BHT_SetBltStatus).
The following backlight related setting items are also available.
(1) Backlight control key
(2) Backlight illumination time
(3) Backlight brightness
(4) Backlight power saving mode
Furthermore, the BHT-700 keypad is also equipped with a backlight (hereafter referred to as key
backlight) for which the following settings can be made.
(1) Illumination device (when BHT_SetBltStatus is called)
(2) Key backlight illumination trigger
4.2. Setting the Backlight Function On/Off Key
You can assign the backlight function on/off key to other keys by the BHT_SetSysSettingDW
(BHT_BACKLIGHT_KEY...) function or by assigning the backlight control function to the magic key.The
table below lists the relationship between the keys that act as a backlight function on/off key and the set
values in the BHT_SetSysSettingDW (BHT_BACKLIGHT_KEY...) function.
If no key is specified as a backlight function on/off key, the combination of the SF key and M3 key works
as a backlight function on/off key by default.
Backlight control key Set value Backlight control key Set value
[M1] 0x00000201 [SF]+[M1] 0x00010201
[M2] 0x00000202 [SF]+[M2] 0x00010202
[M3] 0x00000203 [SF]+[M3] 0x00010203
[Ex]
Execute function BHT_SetSysSettingDW (BHT_BACKLIGHT_KEY, 0x00010201) when assigning a
simultaneous combination of the [SF] and [M1] keys to the backlight control key.
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