Cpu Memory; Lcd; Real Tim Clock (Rtc) - Panasonic GSM EB-A100 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.
Resolution: 112 x 64 pixels. It can accommodate Chinese and large character sets.
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 256K * 16 bits
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