Datasheet

Liquid Crystal Display (LCD) Driver
I/O Registers
MC68HC908LJ24/LK24 — Rev. 2.1 Data Sheet
Freescale Semiconductor Liquid Crystal Display (LCD) Driver 369
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 17-2. 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 17-3. 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