13.3. Description Of Registers
13.3.1. Clock and Calendar Counter (10h 16h)
This is counter registers from a second to a year.
Please refer to [14.1 Clock calendar explanation] for the details.
13.3.2. Wake-up Timer (Down Counter) (1Ah 1Ch, 2Dh)
Wake-up timer(down counter) data is read and stored in this register., along with TE, TF, TIE, TSEL1, TSEL0, TBKON, TBKEbit.
If user does not use this function, TIE,TE should be reset to ”0. The counter data is unknown.
Please refer to 14.2 Wake-up Timer. for the details.
13.3.3. Alarm Registers (17h 19h)
The alarm interrupt function is used, along with the AIE, AF, and WADA bits, to set alarms for specified date, day, hour, and minute
values. If user does not use this function, AIE should be reset to ”0. The data is unknown.
Please refer to 14.3 Alarm Interrupt. for the details.
13.3.4. Function-Related Register (1Dh 1Fh)
1) FSEL1, FSEL0 bit
A combination of the FSEL1 and FSEL0 bits are used to select the frequency to be output.
If customer does not use this function, FESL1, FSEL0 should be set to ”1”.
Please refer to 14.6 FOUT Function
2) USEL, UF, UIE bit
This bit is used to specify either "second update" or "minute update" as the update generation timing of
the time update interrupt function.
If customer does not use this function, USEL, UIE should be reset to”0. UF do not care.”.
Please refer to [14.4. Update interrupt function] for the details.
3) TE, TF, TIE, TSEL1, TSEL0, TSTP, TBKON, TBKE, TMPIN bit
These bits are used to control operation of the wake-up timer interrupt function.
If customer does not use this function, (TE, TIE, TSTP, TMPIN) should be (0,0,0,0), TSEL1, TSEL0(1,0). TF do not care.
Please refer to [14.2 Wake-up timer interrupt function] for the details.
4) WADA, AF, AIE bit
These bits are used to control operation of the alarm interrupt function.
If customer does not use this function, WADA should be “1”, AIE“0”. AF do not care.
Please refer to [14.3. Alarm interrupt function] for the details.
5) ETS, EVF, EIE bit
These bits are used to control operation of the time stamp function.
If customer does not use this function, ETS, EIE should be reset to “0”. EVF do not care.
Please refer to [14.8. Time Stamp function] for the details.
6) VLF, POR, XST bit
These bits are used to detect RTC inner status and recording.
Ex. During power on resetting , lower voltage detection makes VLF bit “1”.
Please refer to [14.5. RTC inner status detection function] for the details.
7) STOP bit
This bit is to stop a timekeeping operation. In the case of “STOP bit = 1":
All the update of timekeeping (year, month, day, week, hour, minute, second, 1/128, 1/512) operation and the calendar operation
stops. With it, an update interrupt event does not occur at an alarm interrupt and the time stamp data is to be stopping condition.
(Please refer to 14.8.5 )
The part of the fixed-cycle timer interrupt function stops.
A count stops the source clock setting of the timer in case of "64 Hz, 1 Hz, 1 min, 1 h".
(In case of 4096 Hz, it does not stop.)
The effect of STOP bit to FOUT functions.
When STOP = "1", 32.768 kHz and 1024 Hz output is possible. But 1 Hz output is disabled.
4) Switchover function cannot work in order that the V
DD
voltage drop detection stops even if a main power supply falls.
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