RV5C339A datasheet(48/51 Pages) RICOH | 3-WIRE SERIAL INTERFACE REAL-TIME CLOCK ICs WITH VOLTAGE MONITORING FUNCTION???

Part No.	RV5C339A

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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RV5C339A

8.3-3 Applied Process of Reading Time and Calendar Data Synchronized with Periodic Interrupt Function

Time data need not be read from all the time counters when used for such ordinary purposes as time count

indication. This applied process can be used to read time and calendar data with substantial reductions in the load

involved in such reading.

CTFG=1?

Generate Interrupt to CPU

Write “

×,×,×,×,0,1,0,0”

to control Register 1

Write “

×,1,×,1,×,0,1,1”

to Control Register 2

NO

YES

Second Digit=00?

NO

YES

Use Previous Minute,

Hour, Day-of-week,

and Day-of-month Data

Read Minute, Hour, Day-of-week,

and Day-of-month Counters

*

1

*

2

*

4

*

3

Other Interrupt

Processes

Write “

×,1,×,1,×,0,1,1”

to Control Register 2

For Time Indication in “Day-of-month, Day-of-week, Hour,

Minute, and Second” Format:

*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 read time data from all the time counters only in the first session of reading time data after writing time data.

*4) 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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RV5C339A Datasheet(PDF) 48 Page - RICOH electronics devices division

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