King Billion Electronics Co., Ltd.
HE89C21
駿 億 電 子 股 份 有 限 公 司
HE80000 SERIES
6.1. LCDC Control register
LCD Control Register LCDC controls the functions of LCD driver; such as contrast level, LCD
waveform type, On/Off, Blank or not, etc.
LCDC
Field
bit 7
-
bit 6
-
bit 5
-
bit 4
-
bit 3
-
bit 2
bit 1
bit 0
TYPE BLANK LCDE
Field
Value Function
TYPE
0
1
0
1
Select Type A LCD waveform
Select Type B LCD waveform
Normal display
BLANK
LCD display blanked. LCD driver changes only COM output signal, SEG
signal remains unchanged.
LCDE
0
1
LCD driver disabled, LCD driver has no output signal.
LCD driver Enabled
Please note that LCD driver must be turned off before the entering sleep mode. That means user must
clear the bit 0 of LCDC to turn off LCD driving circuit before setting bit6 of OP1 to enter sleep mode.
Large current might happen if the procedure is not followed.
Please also note that LCD driver uses slow clock as clock source. The LCD display will not display
normally if it works in Fast clock only mode because the LCD refresh action is too fast.
7.LCD RAM Map
PP=0 COM3 COM2
COM1 COM0 COM3 COM2 COM1 COM0
bit7(C3) bit6(C2) bit5(C1) bit4(C0) bit3(C3) bit2(C2) bit1(C1) bit0(C0)
F0h
F1h
F2h
F3h
F4h
F5h
F6h
F7h
F8h
F9h
FAh
FBh
FCh
FDh
FEh
FFh
S1
S3
S0
S2
S5
S4
S7
S6
S9
S8
S11
S13
S15
S17
S19
S21
S23
S25
S27
S29
S31
S10
S12
S14
S16
S18
S20
S22
S24
S26
S28
S30
January 20, 2003
6
V1.0E
KB [ King blillion Electronics Co.,Ltd. ]
