EM78860
8-BIT MICRO-CONTROLLER
LCD Bias control
IOCE (Bias Control Register)
7
6
5
4
3
2
1
0
Bias3
Bias2
Bias1
Bit 2~4 (Bias1~Bias3) Control bits used to choose LCD operation voltage .
LCD operate voltage
Vop (VDD 5V)
0.60 VDD
0.66 VDD
0.74 VDD
0.82 VDD
0.87 VDD
0.93 VDD
0.96 VDD
1.00 VDD
VDD=5V
3.0 V
3.3 V
3.7 V
4.0 V
4.4 V
4.7 V
4.8 V
5.0 V
000
001
010
011
100
101
110
111
• Bit 5~7 unused
R=1K
V1
Vop=Vdd-Vlcd
R
Vdd
R
8.2R
V2
Vop
000
001
010
011
100
101
110
111
R
R
V3
Vop=Vdd-Vlcd
R=1K
0.4R
0.4R
0.3R
0.3R
0.2R
0.1R
0.1R
Vlcd
Bias3˜1
MUX
:
Vss
Fig.16 LCD bias circuit
* This specification are subject to be changed without notice.
6.24.1998 21
ELAN [ ELAN MICROELECTRONICS CORP ]
