S-35399A03 Datasheet, PDF (17/51 Pages) Seiko Instruments Inc – 2-WIRE REAL-TIME CLOCK

Rev.1.0_00
2-WIRE REAL-TIME CLOCK
S-35399A03
7. Up counter
The up counter is a 24-bit Read-only register. It starts binary counting from “000000h” from power-on and continues
counting as long as power is being applied. It continues counting when initialization, instead of returning to “000000h”. At
power-on, registers are cleared by the power-on detector so that the up counter is cleared to “000000h”. If the power-on
detector does not operate successfully, the counter may start from the indefinite status. For successful operation of the
power-on detector, refer to “„ Power-on Detection Circuit and Register Status”. Regarding the operation timing of the
up counter, refer to “„ Up-Count Operation”.
C64k C128k C256k C512k C1M C2M C4M C8M
B7
B0
C256 C512 C1k C2k C4k C8k C16k C32k
B7
B0
C1 C2 C4 C8 C16 C32 C64 C128
B7
B0
Figure 18 Up Counter
Table 12 Example of Count Value and Read Data in Register
Count Value
000001h
000002h
•
•
•
EFFFFFh
•
•
•
FFFFFFh
Read data in register
000080h
000040h
•
•
•
F7FFFFh
•
•
•
FFFFFFh
Seiko Instruments Inc.
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