MC68HC08LT8 Datasheet, PDF (89/156 Pages) Freescale Semiconductor, Inc – Microcontrollers

Table 8-2. Resistor Ladder Selection
FC
LC
Action
X
0
Each resistor is approximately 37 kΩ (default)
0
1
Each resistor is approximately 146 kΩ
1
1
Fast charge mode
I/O Registers
LCCON[3:0] — LCD Contrast Control
These read/write bits select the bias voltage, V_bias. This voltage controls the contrast of the LCD.
Maximum contrast is set when LCCON[3:0] =%0000;
minimum contrast is set when LCCON[3:0] =%1111.
Table 8-3. LCD Bias Voltage Control
LCCON3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
LCCON2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
LCCON1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
LCCON0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Bias Voltage
(approximate % of V_DD)
0.6
2.9
5.2
7.4
9.6
11.6
13.5
15.3
17.2
18.8
20.5
22.0
23.6
25.0
26.4
27.7
MC68HC08LT8 Data Sheet, Rev. 1
Freescale Semiconductor
89