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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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SH7708 数据表(PDF) 336 Page - Renesas Technology Corp |
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SH7708 数据表(HTML) 336 Page - Renesas Technology Corp |
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336 / 633 page  318 11.5 Usage Notes 11.5.1 Writing to Registers Synchronization processing is not performed for timer counting during register writes. When writing to registers, always clear the appropriate start bits for the channel (STR2–STR0) in the timer start register (TSTR) to halt timer counting. 11.5.2 Reading Registers Synchronization processing is performed for timer counting during register reads. When timer counting and register read processing are performed simultaneously, the register value before TCNT counting down (with synchronization processing) is read. 11.5.3 Clearing UNF in the TCR Register When the RTC (realtime clock) is specified for use as the TMU (timer) clock source in the SH7708 and SH7708S the procedure shown in the flowchart below should be used to clear the underflow flag (UNF) in the timer control register (TCR). No Yes Clear UNF flag Read UNF flag UNF = 0? Figure 11.10 UNF Flag Clearing |
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