Epson RX4111CE Applications Manual

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13. Overview of Functions and RegistersRX4111CE Jump to Top / BottomETM62E-02 Seiko Epson Corporation 1813. Overview of Functions and RegistersNote: The initialization of the register is necessary about the unused function.13.1. Overview of Functions1) Clock functionsThis function is used to set and read out second, minute, hour, day, month, last two digits of the year, and date data.Any two-digit year that is a multiple of 4 is treated as a leap year and calculated automatically as such until the year2099. It corresponds to the writing of 60 seconds for leap second correction.2) Wake-up Timer Interrupt FunctionThe Wake-up timer interrupt function generates an interrupt event periodically at any Wake-up set between 244.14sand 32 years.When an interrupt event is generated, the /INT pin goes to low level and 1 is set to the TF bit to report that an event hasoccurred.It can use Wake-up timer interrupt function as Long-Timer or Wake up timer.This function measures the operation time on the main power supply and the operation time on the backup power supplyand can automatically sum them up.3) Alarm Interrupt FunctionThe alarm interrupt function generates interrupt events for alarm settings such as date, day, hour, minute, and secondsettings. When an interrupt event occurs, the AF bit value is set to 1and the /INT pin goes to low level to indicate that anevent has occurred.4) Voltage Drop Detection FunctionThis is a function to detect a drop in VDD voltage.It is possible to judge whether the timekeeping contents are valid, such as when the initial power is turned on or when thepower supply voltage drops.When a voltage drop is detected, the device enters the initial state (reset state) by the power-on reset function.5) Frequency Stop Detection FunctionThis flag bit indicates the retained status of clock operations or internal data. Its value changes from 0 to 1 when data lossmight have occurred due to a low supply voltage.6) Clock Output FunctionA clock with the same frequency (32.768 kHz) as the built-in crystal resonator can be output from the FOUT pin. Outputcould also be 1 Hz, or 1024 Hz.7) Time Stamp FunctionData can be recorded from 1/10024 second digit to year digit.8) User RAMRAM register is read/write accessible for any data.Built-in 8bit × 64word (512bit) RAMWhen not use Timestamp function, it can use for users memory.