Cpu Memory; Lcd; Real Time Clock (Rtc) - Panasonic EB-G50 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:
64Mbits 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. A 96 x 128 pixels graphical display is used which can display up to 21 characters x 5 rows - plus two rows of icons.
It can accommodate Chinese and large character sets.
Figure 5.8. LCD Dimensions
The LCD driver is controlled by setting the command register through the AD6525 u-wire interface and an I/O
line that distinguishes between command or 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 Tim Clock (RTC)
Clock functions are provided by a Real Time Clock built into AD6525. The module is synchronized by a 32.768 kHz
crystal and has a backup power source provided by a capacitor. AD6525 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 organizer
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.
organized as 4M * 16bits or 8M * 8bits
organized as 2M * 16 bits
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