RV5C338A datasheet(47/52 Pages) RICOH | 3-WIRE SERIAL INTERFACE REAL-TIME CLOCK ICs WITH VOLTAGE MONITORING FUNCTION?

Part No.	RV5C338A

Description	3-WIRE SERIAL INTERFACE REAL-TIME CLOCK ICs WITH VOLTAGE MONITORING FUNCTION?

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Manufacturer	RICOH [RICOH electronics devices division]

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8.3 Reading Time and Calendar Data

8.3-1 Ordinary Process of Reading Time and Calendar Data

Wait for 31

µs

Read from Time Counter

and Calendar Counter

*

1

8.3-2 Basic Process of Reading Time and Calendar Data Synchronized with Periodic Interrupt

CTFG=1?

Other Interrupt

Processes

Generate Interrupt in CPU

Write “

×,1,×,1,×,0,1,1”

to Control Register 2

Set Periodic Interrupt

Cycle Selection Bits

YES

NO

Read from Time Counter

and Calendar Counter

*

1

*

2

*

3

*1) This step of waiting is detailed in “1.5 Considerations in Reading and

Writing Time Data”.

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

periodic interrupt function.

*2) If this step is completed within 1 second, the step of waiting described in

“8.3-1 Ordinary Process of Reading Time and Calendar Data” above need

not be conducted. This step is detailed in “1.5 Considerations in Reading

and Writing Time Data”.

*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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RV5C338A Datasheet(PDF) 47 Page - RICOH electronics devices division

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