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參數(shù)資料
| 型號： | R2025S |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | XO, clock |
| 英文描述： | High precision I2C-Bus Real-Time Clock Module |
| 中文描述： | REAL TIME CLOCK, PDSO14 |
| 封裝： | 10.10 X 7.40 MM, 3.10 MM HEIGHT, SOP-14 |
| 文件頁數(shù)： | 42/47頁 |
| 文件大?。?/td> | 524K |
| 代理商： | R2025S |
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R2025S/D
Typical Software-based Operations
Initialization at Power-on
42
Start
*1)
Yes
No
VDET=0
Warning Back-up
Battery Run-down
Set
Control Register 1 and 2,
etc.
Power-on
*2)
*4)
*3)
PON=1
Yes
No
*1) After power-on from 0 volt, the start of oscillation and the process of internal initialization require a time
span on the order of 1 to 2sec, so that access should be done after the lapse of this time span or more.
*2) The PON bit setting of 0 in the Control Register 1 indicates power-on from backup battery and not from 0v.
For further details, see "P.31 Power-on Reset, Oscillation Halt Sensing, and Supply Voltage Monitoring
PON, /XST, and VDET ".
*3) This step is not required when the supply voltage monitoring circuit is not used.
*4) This step involves ordinary initialization including the Oscillation Adjustment Register and interrupt cycle
settings, etc.
Writing of Time and Calendar Data
*1) When writing to clock and calendar counters, do not insert Stop Condition
until all times from second to year have been written to prevent error in
writing time. (Detailed in "P.27 Data Transmission under Special
Condition".
*2) Any writing to the second counter will reset divider units lower than the
second digits.
*3) Please see “P,28
The Necessity for Correction of Time Count
Deviations
”
*4) Take care so that process from Start Condition to Stop Condition will be
complete within 0.5sec. (Detailed in "P.27 Data Transmission under
Special Condition".
The R2025S/D may also be initialized not at power-on but in the process
of writing time and calendar data.
Write to Time Counter and
Calendar Counter
*2)
Stop Condition
*4)
Start Condition
*1)
Write to Clock Adjustment
Register
*3)
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