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RV5C386A_03

I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC WITH VOLTAGE MONITORING FUNCTION

RICOH Co.,Ltd. 

RV5C386A

8.3 Reading Time and Calendar Data

8.3-1 Ordinary Process of Reading Time and Calendar Data

Start condition

*1

Read from clock and

calendar counters

*1) When reading from clock and calendar counters, do not insert stop

condition until all times from second to year have been read to prevent

error in reading time. (Detailed in “1.2-6 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 “1.2-6 Data transmission under

special condition”.

Stop condition

*2

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

CTFG=1?

NO

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) 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.

Write “×,1,×,1,×,0,1,1”

to Control Register 2

*3

47

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