Cpu Memory; Lcd; Real Tim Clock (Rtc) - Panasonic EB-X300 Service Manual

5.2.5. CPU Memory

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
32Mbits Pseudo RAM

5.2.6. LCD

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.
5.2.7. Real Time Clock (RTC)
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.
organised as 8M * 16 bits
organised as 2M * 16 bits
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