RV5C338A-E2 Просмотр технического описания (PDF) - RICOH Co.,Ltd.

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RV5C338A-E2

3-WIRE SERIAL INTERFACE REAL-TIME CLOCK ICS WITH VOLTAGE MONITORING FUNCTION

RICOH Co.,Ltd. 

R×5C338A

8.3 Reading Time and Calendar Data

8.3-1 Ordinary Process of Reading Time and Calendar Data

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

Writing Time Data”.

Wait for 31µs

*1

Read from Time Counter

and Calendar Counter

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

Set Periodic Interrupt

Cycle Selection Bits

*1

Generate Interrupt in CPU

NO

CTFG=1?

YES

Read from Time Counter

Other Interrupt

and Calendar Counter *2 Processes

*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.

Write “×,1,×,1,×,0,1,1” *3

to Control Register 2

44

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