RV5C387A datasheet(40/42 Pages) RICOH

Part #	RV5C387A

Description	I2C-bus Real-Time Clock ICs with Voltage Monitoring Function?

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Manufacturer	RICOH [RICOH electronics devices division]

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RV5C387A

PRELIMINARY

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14.8.3.

Reading Time and Calendar Data

(1) Ordinary Process of Reading Time and Calendar Data

Read from Time Counter

and Calendar Counter

*2)

Start Condition

*1)

(2) Basic Process of Reading Time and Calendar Data with Periodic Interrupt Function

*2)

Other Interrupt

Processes

Set Periodic Interrupt

Cycle Selection Bits

CTFG=1?

Read from Time Counter

and Calendar Counter

Yes

No

Control Register 2

←(X1X1X011)

Generate Interrupt in CPU

*1)

*3)

*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 "14.1.5. Data Transmission under Special

Condition".

*2) Take care so that process from Start Condition to Stop Condition will be

complete within 0.5sec.

(Detailed in "14.1.5. Data Transmission under

Special Condition".

*1) This step is intended to select the level mode as a

waveform mode for the periodic interrupt function.

*2) This step must be completed within 0.5 second.

*3) This step is intended to set the CTFG bit to 0 in the

Control Register 2 to cancel an interrupt to the CPU.

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RV5C387A Datasheet(PDF) 40 Page - RICOH electronics devices division

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