R2045S datasheet(44/50 Pages) RICOH

Part #	R2045S

Description	4-wire Serial Interface Real Time Clock Module

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Manufacturer	RICOH [RICOH electronics devices division]

Direct Link	http://www.ricoh.com

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R2045S/D

44

• Writing of Time and Calendar Data

Write to Time Counter and

Calendar Counter

*2)

CE

←L

*1)

CE

← H

*1)

Write to Clock Adjustment

Register

*3)

• Reading Time and Calendar Data

(1) Ordinary Process of Reading Time and Calendar Data

Read from Time Counter

and Calendar Counter

*1)

CE

← L

CE

← H

*1)

*1) When writing to clock and calendar counters, do not drive CE to L until

all times from second to year have been written to prevent error in

writing time.

For more detailed in "P.25

Considerations in Reading

and Writing Time Data under special condition".

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

second digits.

*3) Please see “P,27

The Necessity for Correction of Time Count

Deviations”

The R2045S/D may also be initialized not at power-on but in the

process of writing time and calendar data.

*1) When reading clock and calendar counters, do not drive CE to L until

all times from second to year have been written to prevent error in

writing time.

For more detailed in "P.25

Considerations in Reading

and Writing Time Data under special condition".

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R2045S Datasheet(PDF) 44 Page - RICOH electronics devices division

R2045S Datasheet(HTML) 44 Page - RICOH electronics devices division

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