13. Overview of Functions and Registers
RX4111CE
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ETM62E-02
Seiko Epson Corporation
18
13. Overview of Functions and Registers
Note:
The initialization of the register is necessary about the unused function.
13.1. Overview of Functions
1) Clock functions
This 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 year
2099. It corresponds to the writing of 60 seconds for leap second correction.
2) Wake-up Timer Interrupt Function
The 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 has
occurred.
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 supply
and can automatically sum them up.
3) Alarm Interrupt Function
The alarm interrupt function generates interrupt events for alarm settings such as date, day, hour, minute, and second
settings. When an interrupt event occurs, the AF bit value is set to 1
and the
/INT pin goes to low level to indicate that an
event has occurred.
4) Voltage Drop Detection Function
This is a function to detect a drop in V
DD
voltage.
It is possible to judge whether the timekeeping contents are valid, such as when the initial power is turned on or when the
power 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 Function
This flag bit indicates the retained status of clock operations or internal data. Its value changes from 0 to 1 when data loss
might have occurred due to a low supply voltage.
6) Clock Output Function
A clock with the same frequency (32.768 kHz) as the built-in crystal resonator can be output from the FOUT pin. Output
could also be 1 Hz, or 1024 Hz.
7) Time Stamp Function
Data can be recorded from 1/10024 second digit to year digit.
8) User RAM
RAM register is read/write accessible for any data.
Built-in 8bit × 64word (512bit) RAM
When not use Timestamp function, it can use for users memory.
