Datasheet

Liquid Crystal Display Driver (LCD)
MC68HC908LJ12 — Rev. 2.1 Technical Data
Freescale Semiconductor Liquid Crystal Display Driver (LCD) 335
16.9 I/O Registers
Sixteen (16) registers control LCD driver module operation:
• LCD control register (LCDCR)
• LCD clock register (LCDCLK)
• LCD data registers (LDAT1–LDAT14)
16.9.1 LCD Control Register (LCDCR)
The LCD control register (LCDCR):
• Enables the LCD driver module
• Selects bias resistor value and fast-charge control
• Selects LCD contrast
LCDE — LCD Enable
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.
1 = LCD driver module enabled
0 = LCD driver module disabled
FC — Fast Charge
LC — Low Current
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.
Address: $0051
Bit 7654321Bit 0
Read:
LCDE
0
FC LC LCCON3 LCCON2 LCCON1 LCCON0
Write:
Reset:00000000
= Unimplemented
Figure 16-16. LCD Control Register (LCDCR)