MC68HC908LJ24 Datasheet, PDF (359/464 Pages) Motorola, Inc – Microcontrollers

Freescale Semiconductor, Inc.
Liquid Crystal Display (LCD) Driver
I/O Signals
17.7.1 BP0—BP3 (Backplane Drivers)
BP0–BP3 are the backplane driver output pins. These are connected to
the backplane of the LCD panel. Depending on the LCD duty selected,
the voltage waveforms in Figure 17-5, Figure 17-6, and Figure 17-7
appear on the backplane pins.
BP3 pin is only used when 1/4 duty is selected. The pin becomes FP0
for static and 1/3 duty operations.
DUTY = STATIC
BP0
1FRAME
V_LCD
V_LCD1
V_LCD2
V_LCD3
NOTES:
1. BP1, BP2, and BP3 are not used.
2. At static duty, 1FRAME is equal to the cycle of LCD waveform base clock.
Figure 17-5. Static LCD Backplane Driver Waveform
DUTY = 1/3
BP0
1FRAME
V_LCD
V_LCD1
V_LCD2
V_LCD3
V_LCD
BP1
V_LCD1
V_LCD2
V_LCD3
BP2
NOTES:
1. BP3 is not used.
2. At 1/3 duty, 1FRAME has three times the cycle of LCD waveform base clock.
V_LCD
V_LCD1
V_LCD2
V_LCD3
Figure 17-6. 1/3 Duty LCD Backplane Driver Waveforms
MC68HC908LJ24/LK24 — Rev. 2
MOTOROLA
Liquid Crystal Display (LCD) Driver
For More Information On This Product,
Go to: www.freescale.com
Data Sheet
359