3. TECHNICAL BRIEF
Interconnection with external devices
RTC block interface
Countered by external X-TAL
The X-TAL oscillates 32.768KHz.
LCD module interface
Mainly controlled by _LCD_MAIN_CS, LCD_RES, LCD_RS, _WR, DATA [00...15] signals.
Table 3-3.
Description
_LCD_MAIN_CSLCD driver chip enable. LCD driver IC has own CS pin
LCD_RESThis pin resets LCD module.
This pin determines whether the data to LCD module are display data or
LCD_RS (ADD1)control data. ADD1 can select 16 bit parallel bus. ADD1 is also used to
address flash memory.
__WRWrite control. The phone do not read data from LCD chip.
DATA [00...15]Parallel data lines. Color LCD driver chip uses the 16-bit data interface.
3V0_VLCDRegulated 3V voltage is supplied to white colored LED driver for backlighting.
LCD_BACKLIGHT
Control signal of white LED driver IC.
_CTL
RF interface
The AD6522 control RF parts through TXEN, RXON1, RXON2, AGCEN, PLL_DATA, PLL_CLK,
PLL_LE etc.
Table 3-4.
Signal NameDescription
TXENTX Enable/Disable
RXON1LNA, Mixer 1 On/Off
RXON2Mixer 2 On/Off
AGCENAGC Enable/Disable
PLL_DATASerial Data to PLL
PLL_CLKClock to PLL
PLL_LEPLL Enable/Disable
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