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參數(shù)資料
| 型號： | HE83R540(S) |
| 文件頁數(shù)： | 5/16頁 |
| 文件大?。?/td> | 312K |
| 代理商： | HE83R540(S) |
King Billion Electronics Co., Ltd
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HE83R123
HE80000 Series
4.
LCD Power Supply
April 28, 2003
This specification is subject to change without notice. Please contact sales person for the latest version before use.
5
V1.0E
The LCD power supply is equipped with input power regulator, voltage charge pumt, and bias voltage
generating resistor network. The input power of MCU is regulated and multiplied by 4 times to generate
LCD bias for LCD driver. The regulator output voltage can be adjusted by the resistor between LV1 and
LVF pads.
LV4
LV3
LV2
LV1
LVF
LC2
LC1
104
0.1uF
R
0.1uF
0.1uF
0.1uF
With the regulated LCD power, the LCD display can give steady visual effect over a wide range of
operating voltage. The built-in regulator must be enabled by mask option MO_ LVRG to function.
MO_LVRG Function
0
1
Disable LCD regulator
Enable LCD regulator
Please note that to emulate the visual effect of 1/4 bias on the ICE 3.X version the LR2 and LR3 on the
top board need be shorted.
5.
LCDC Control register
LCD Control Register LCDC controls the functions of LCD driver; such as contrast level, LCD
waveform type, On/Off, Blank, etc.
LCDC
bit 7
-
bit 6
-
bit 5
-
bit 4
-
bit 3
-
bit 2
TYPE
bit 1
BLANK LCDE
bit 0
Field
TYPE
BLANK
Value Function
0
Select Type A LCD waveform
1
Select Type B LCD waveform
0
Normal display
1
LCD display blanked. LCD driver changes only COM output signal, SEG
signal remains unchanged.
0
LCD driver disabled, LCD driver has no output signal.
1
LCD driver Enabled
LCDE
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