mc68hc05l25 Freescale Semiconductor, Inc, mc68hc05l25 Datasheet - Page 103

• Manufacturer Part Number: mc68hc05l25
• Description: M68hc05 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

The LCD uses the three bias voltages typically as follows:
The three voltages shown above are arranged so that the external voltages will have a V
V
11.4.2 Backplane Drivers (BP0–BP3)
Pins BP0–BP3 are the output terminals for the backplane drivers.
These are connected to the backplane of the LCD panel. Depending on the duty, the waveforms in
11-5
11.4.3 Frontplane Drivers
Pins FP0–FP24 are the output terminals for the frontplane drivers. These are connected to the frontplane
of the LCD panel. Depending on the content of the data latch, the waveforms in
11-8
Freescale Semiconductor
LCD3
1. V
2. V
3. V
and
appear on the frontplane drivers.
relationship in a voltage divider configuration.
LCD1
LCD2
LCD3
Figure 11-6
.
= V
= V
= V
DUTY = 1/3
NOTES:
1. BP3 is not used.
2. At 1/3 duty, 1FRAME has three times the cycle of LCD waveform base clock.
DD
DD
DD
BP0
BP1
BP2
— 1/3 V
— 2/3 V
— V
appear on the backplane pins.
Figure 11-5. 1/3 Duty LCD Backplane Driver Waveforms
LCDA
LCDA
LCDA
= V
LCD
(V
(Usually, V
LCDA
MC68HC05L25 Data Sheet, Rev. 3.1
1FRAME
(V
LCD
is the ON voltage for the LCD modules.)
is the external pin.)
LCDA
≤ V
DD
is used.)
Figure 11-7
Terminal Description
V
V
V
V
V
V
V
V
V
V
V
V
DD
LCD1
LCD2
LCD3
DD
LCD1
LCD2
LCD3
DD
LCD1
LCD2
LCD3
LCD1
and
> V
Figure
LCD2
Figure
103
>