S-35399A02 Datasheet, PDF (19/55 Pages) Seiko Instruments Inc – 2-WIRE REAL-TIME CLOCK

Rev.1.0_00
2-WIRE REAL-TIME CLOCK
S-35399A02
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”.
C6 4k C12 8k C256k C51 2k C1 M C2M C4M C8 M
B7
B0
C2 56 ^{C51 2} C1k C2k C4k C8 k C16k C3 2k
B7
B0
C1
C2 _C4
C8 C16 C32 C64 C128
B7
B0
Figure 21 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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