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3. TECHNICAL BRIEF
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(U101),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
_LCD_CS
LCD_DIM_CTRL
LCD_RESET
(GPIO 15)
_WR
2V8_VMEM
LCD_ID(GPIO_16)
LCD_BL_EN
MAIN LCD driver chip enable. MAIN LCD driver IC has own CS pin
It controls dimming mode of LCD module.(GPIO_5)
This pin resets LCD module. This signal comes from DBB directly.
Enable writing to LCD Driver.
2.8V voltage is supplied to LCD driver IC.
It determines the maker of LCD module.
It controls back-light of LCD module.(GPO_23)
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