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RV5C387A Datasheet(PDF) 47 Page - RICOH electronics devices division |
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RV5C387A Datasheet(HTML) 47 Page - RICOH electronics devices division |
47 / 49 page ![]() 47 RV5C387A 8.3 Reading Time and Calendar Data 8.3-1 Ordinary Process of Reading Time and Calendar Data Stop condition Start condition Read from clock and calendar counters * 1 * 2 8.3-2 Basic Process of Reading Time and Calendar Data Synchronized with Periodic Interrupt CTFG=1? 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 Other Interrupt Processes *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”. *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. |
Similar Part No. - RV5C387A_03 |
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Similar Description - RV5C387A_03 |
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