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– 5-9 –
To reduce component space, the phone uses a BGA package with Dual operation Flash memory and SRAM MCP.
The following memory configuration is used:
128Mbits
Flash memory
organised as 8M * 16 bits
32Mbits
Pseudo RAM
organised as 2M * 16 bits
The LCD module consists of a LCD glass, white LED and driver chip connection to the Main PCB via a flexible PCB strip.
The resolution
of the LCD is
128x128 pixels. It can accommodate Chinese and large character sets.
The LCD driver is controlled by setting the command register through the U101 u-wire interface and an I/O line that
distinguishes between command and data. To send data or a command to the display driver, the
nDISPLAYCS
line is used for
chip select. LCD_CTL is set high to send data and set low to send commands.
Clock functions are provided by a Real Time Clock built into U101. The module is synchronised by a 32.768 kHz crystal and
has a backup power source provided by a capacitor.
U101 has a clock auto compensation function to take into account any inaccuracies of the crystal. This is able to calibrate out
crystal tolerance / drift by writing to the compensation registers. This functionality allows the application software to implement
standard, calendar, or organiser functions such as:
■
Time and date display
■
Programmable alarm
■
Programmable mobile activation
■
The RTC interrupt is routed through the IRQ-controller to the MCU or the DSP, as defined by software in interrupt
configuration registers.
5.2.7. Real Time Clock (RTC)
5.2.6. LCD
5.2.5. CPU Memory