Rainbow Electronics W90P710CDG - Manual (Page 425)

W90P710CD/W90P710CDG
Publication Release Date: September 19, 2006
- 425 - Revision B2
Tick Time interrupt: RTC block use a counter to calibrate the tick time count value. When the value
in counter reaches zero, RTC will issue an interrupt.
RTC register property: When system power is off but RTC power is on, data stored in RTC registers
will not be lost except RTC_TSSR, RTC_RIER and RTC_RIIR. Because of difference between RTC
clock and system clock, every time user write new data to any one register, the register will be
updated until 2 RTC clock later (60us).
In addition, user must be aware that RTC block does not check whether loaded data is out of bounds.
RTC does not check rationality between RTC_DWR and RTC_CLR either.