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RV5C348B Datasheet(PDF) 43 Page - RICOH electronics devices division |
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RV5C348B Datasheet(HTML) 43 Page - RICOH electronics devices division |
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43 / 47 page  Rx5C348A/B Reading Time and Calendar Data (1) Ordinary Process of Reading Time and Calendar Data Read from Time Counter and Calendar Counter *2) CE ← L CE ← H *1) *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 "P.24 Considerations in Reading and Writing Time Data under special condition". *2) Take care so that process from Start Condition to Stop Condition will be complete within 0.5sec. (Detailed in "P.24 Considerations in Reading and Writing Time Data under special condition". (2) Basic Process of Reading Time and Calendar Data with Periodic Interrupt Function *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 1.0 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. *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) 12345 - 43 - ＊RT5C348B (TSSOP10G) and RS5C348B (SSOP10) are the discontinued products. As of July in 2016. |
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