Datasheet

Liquid Crystal Display (LCD) Driver
I/O Signals
MC68HC908LJ24/LK24 — Rev. 2.1 Data Sheet
Freescale Semiconductor Liquid Crystal Display (LCD) Driver 359
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.
Figure 17-5. Static LCD Backplane Driver Waveform
Figure 17-6. 1/3 Duty LCD Backplane Driver Waveforms
1FRAME
DUTY = STATIC
BP0
V
LCD
V
LCD1
V
LCD3
V
LCD2
1. BP1, BP2, and BP3 are not used.
2. At static duty, 1FRAME is equal to the cycle of LCD waveform base clock.
NOTES:
1FRAME
DUTY = 1/3
BP0
V
LCD
V
LCD1
V
LCD3
V
LCD
V
LCD2
V
LCD3
V
LCD
V
LCD1
V
LCD2
V
LCD3
V
LCD2
V
LCD1
BP1
BP2
1. BP3 is not used.
2. At 1/3 duty, 1FRAME has three times the cycle of LCD waveform base clock.
NOTES: