Epson RX8130CE - Description of Registers; Clock and Calendar Registers (0 H ~ 16 H); RAM Registers (20 H ~ 23 H); Alarm Registers (17 H ~ 19 H)

13. Overview of Functions and Registers
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ETM50E-07 Seiko Epson Corporation 22
13.3. Description of registers
13.3.1. Clock and calendar registers (0h ~ 16h)
This is counter registers from a second to a year.
See [14.1 Clock calendar explanation] for details.
13.3.2. RAM registers (20h ~ 23h)
This RAM register is read/write accessible for any data in the range from 00h to FFh.
13.3.3. Alarm registers (17h ~ 19h)
The alarm interrupt function is used, along with the AE, AF, and WADA bits, to set alarms for specified date, day, hour,
and minute values. See [14.3. Alarm Interrupt Function ] for the details.
13.3.4. Timer setting and Timer counter register for wakeup timer (1Ah ~ 1Eh)
This register is used to set the default (preset) value for the counter.
To use the wakeup timer interrupt function ,TE,TF,TIE,TSEL2,TSEL1,TSEL0,TBKON,TBKE bits are
set and used. When the wakeup timer interrupt function is not being used, the wakeup timer control register
can be used as a RAM register. In such cases, stop the wakeup timer function by writing "0" to the TE and
TIE bits. See [14.2. Wakeup Timer Interrupt Function ] for the details.
13.3.5. Function-related register 1 (1Ch ~ 1Eh)
1) FSEL1, FSEL0 bit
A combination of the FSEL1 and FSEL0 bits are used to select the frequency to be output.
The choice is possible by a combining FSEL-bits and CE/FOE-pin, select the frequency of clock
output or inhibit the clock output. See [14.6.  FOUT Function ] for the details.
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.
See [14.4. Update interrupt function] for the details.
3) TE, TF, TIE, TSEL2, TSEL1, TSEL0, TSTP,TBKON,TBKE bit
These bits are used to control operation of the wakeup timer interrupt function.
4) WADA, AF, AIE bit
These bits are used to control operation of the alarm interrupt function.
5) TEST bit
These bits are the manufacturer's test bit. Always leave this bit value as "0"..