LG C3400 Service Manual page 21

3. TECHNICAL BRIEF
3.5.1 Interconnection with external devices
A. RTC block interface
Countered by external X-TAL
The X-TAL oscillates 32.768KHz
B. LCD module interface
The LCD module is controlled by CAMERA IC, CL761S If CL761S is in the state of by-pass
mode, the LCD control signals from AD6527B are by-passed through CL761S.
In operating mode, the CL761S controls the LCD module through L_MAIN_LCD_CS,
L_SUB_LCD_CS, LCD_RESET, LCD_RS, LCD_WR, LCD_RD, L_DATA[15-00],
2V85_VCAM, IF_MODE, LCD_ID[0:2].
Signals
L_MAIN_LCD_CS
L_SUB_LCD_CS
LCD_RESET
(GPIO 15)
LCD_WR
LCD_RD
LCD_RS
2V85_VCAM
IF_MODE
(GPO_8)
LCD_ID1
(AUXADC1 in ABB)
LCD_ID2(GPIO_16)
LCD_ID3(GPIO_17)
Description
MAIN LCD driver chip enable. MAIN LCD driver IC has own CS pin
This pin resets LCD module.
This pin resets LCD module. This signal comes from DBB directly.
Enable writing to LCD Driver.
Enable reading to LCD Driver.
This pin determines whether the data to LCD module are display data
or control data. LCD_RS can select 16 bit parallel bus.
2.85V voltage is supplied to LCD driver IC.
Select 16bits or 8bits interface mode for MAIN LCD.
For the future
Select LCD module maker(2.4V : SII, 0V : HyeLCD)
For the future.
Table 3-3. LCD CONTRON SIGNALS DISCRIPTION
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