mc68hc908lv8 Freescale Semiconductor, Inc, mc68hc908lv8 Datasheet - Page 128

• Manufacturer Part Number: mc68hc908lv8
• Description: M68hc08 Microcontrollers 8-bit Microcontroller With Integrated Lcd Driver
• Manufacturer: Freescale Semiconductor, Inc

Liquid Crystal Display (LCD) Driver
The voltage waveform across the "e" segment of the LCD (between BP2 and FP0) is illustrated in
Figure
therefore, the segment will be OFF.
9.8 I/O Registers
Fifteen (15) registers control LCD driver module operation:
9.8.1 LCD Control Register (LCDCR)
The LCD control register (LCDCR):
LCDE — LCD Enable
FC — Fast Charge
LC — Low Current
128
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This read/write bit enables the LCD driver module; the backplane and frontplane drive LCD waveforms
out of BPx and FPx pins. Reset clears the LCDE bit.
These read/write bits are used to select the value of the resistors in resistor ladder for LCD voltages.
Reset clears the FC and LC bits.
1 = LCD driver module enabled
0 = LCD driver module disabled
LCD control register (LCDCR)
LCD clock register (LCDCLK)
LCD data registers (LDAT1–LDAT13)
Enables the LCD driver module
Selects bias resistor value and fast-charge control
Selects LCD contrast
9-15. As shown in the waveform, the voltage peaks do not reach the LCD-ON voltage, V
Address:
BP2–FP0
Reset:
Read:
Write:
$0051
LCDE
Bit 7
0
Figure 9-15. "e" Segment Voltage Waveform
Figure 9-16. LCD Control Register (LCDCR)
= Unimplemented
6
0
0
MC68HC908LV8 Data Sheet, Rev. 2
FC
5
0
LC
4
0
LCCON3
3
0
LCCON2
2
0
LCCON1
1
0
+V
+V
+V
0
–V
–V
–V
Freescale Semiconductor
LCCON0
LCD2
LCD1
LCD
LCD
LCD1
LCD2
Bit 0
0
LCD
,