Requirements for a Real Time Clock (RTC) implementation are a basic clock (hours and minutes), a calendar and a timer with alarm and power on/off-function and miscellaneous calls. The RTC will contain only the time base and the alarm timer but all other functions (e.g. calendar) are implemented with the MCU software.
The RTC is integrated in the CCONT, because the CCONT already contains the power up/ down functions and a 32kHz sleep-clock, which is always running when the phone battery is connected. The 32 KHz sleep-clock is used as time source to a RTC block.
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You can now recondition your old batteries at home and bring them back to 100 percent of their working condition. This guide will enable you to revive All NiCd batteries regardless of brand and battery volt. It will give you the required information on how to re-energize and revive your NiCd batteries through the RVD process, charging method and charging guidelines.