Datasheet

Liquid Crystal Display Driver (LCD)
Technical Data MC68HC908LJ12 — Rev. 2.1
336 Liquid Crystal Display Driver (LCD) Freescale Semiconductor
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 when LCCON[3:0] = 1111.
Table 16-2. Resistor Ladder Selection
FC LC Action
X0
Each resistor is approximately 37 kΩ (default)
01
Each resistor is approximately 146 kΩ
11
Fast charge mode
Table 16-3. LCD Bias Voltage Control
LCCON3 LCCON2 LCCON1 LCCON0
Bias Voltage
(% of V
DD
)
0000 0.6%
0001 2.9%
0010 5.2%
0011 7.4%
0100 9.6%
0101 11.6%
0110 13.5%
0111 15.3%
1000 17.2%
1001 18.8%
1010 20.5%
1011 22.0%
1100 23.6%
1101 25.0%
1110 26.4%
1111 27.7%