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S3C6400
RISC MICROPROCESSOR
BACKUP BATTERY OPERATION
The RTC logic can be driven by the backup battery, which supplies the power through the RTCVDD pin into the
RTC block, even if the system power is off. When the system is off, the interfaces of the CPU and RTC logic
must be blocked, and the backup battery only drives the oscillation circuit and the BCD counters to minimize
power dissipation.
ALARM FUNCTION
The RTC generates an alarm signal at a specified time in the power-off mode or normal operation mode. In
normal operation mode, the alarm interrupt (ALMINT) is activated. In the power-off mode, the power
management wakeup (PMWKUP) signal is activated as well as the ALMINT. The RTC alarm register (RTCALM)
determines the alarm enable/disable status and the condition of the alarm time setting.
TICK TIME INTERRUPT
The RTC tick time is used for interrupt request. The TICNT register has an interrupt enable bit and the count
value for the interrupt. The count value reaches '0' when the tick time interrupt occurs. Then the period of
interrupt is as follows:
Period = (n+1)/32768 second ( n= tick counter value)
Note:
This RTC time tick may be used for real time operating system (RTOS) kernel time tick.
If time tick is generated by the RTC time tick, the time related function of RTOS will always synchronized in real
time.
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
Specifications and information herein are subject to change without notice.
Real Time Clock
33-3
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