R2023K datasheet(47/50 Pages) RICOH

47 / 50 page

R2023K/T

Typical Software-based Operations

• Initialization at Power-on

Start

*1)

Yes

VDET=0?

Warning Back-up

Battery Run-down

Set Oscillation Adjustment

Power-on

*2)

*4)

*3)

PON=1?

Yes

*1) After power-on from 0 volt, the start of oscillation and the process of internal initialization require a time

span on 1to 2seconds, 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.36

• PON, XST , 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

Write to Time Counter and

Calendar Counter

*2)

Stop Condition

*3)

Start Condition

*1)

*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.28 Data Transmission

under Special Condition".

*2) Any writing to the second counter will reset divider units lower

than the second digits.

*3) Take care so that process from Start Condition to Stop Condition

will

complete

within

0.5sec.

(Detailed

"P.28

Data

Transmission under Special Condition".

The R2023K/T may also be initialized not at power-on but in the

process of writing time and calendar data.

R2023K Datasheet(PDF) 47 Page - RICOH electronics devices division

R2023K Datasheet(HTML) 47 Page - RICOH electronics devices division

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