3. TECHNICAL BRIEF
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3.4.1 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 AD6527B(U103),DBB.
In operating mode, the AD6527B(U103) controls the LCD module through _LCD_CS,
LCD_DIM_CTRL, LCD_RESET, _WR, 2V8_VMEM, LCD_ID, LCD_BL_EN.
Signals Description
_LCD_CS MAIN LCD driver chip enable. MAIN LCD driver IC has own CS pin
LCD_DIM_CTRL It controls dimming mode of LCD module.(GPIO_5)
LCD_RESET
This pin resets LCD module. This signal comes from DBB directly.
(GPIO 15)
_WR Enable writing to LCD Driver.
2V8_VMEM 2.8V voltage is supplied to LCD driver IC.
LCD_ID(GPIO_16) It determines the maker of LCD module.
LCD_BL_EN It controls back-light of LCD module.(GPO_23)
Table 3-2. LCD CONTRON SIGNALS DISCRIPTION
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