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SH7708 データシート(PDF) 333 Page - Renesas Technology Corp |
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SH7708 データシート(HTML) 333 Page - Renesas Technology Corp |
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333 / 633 page  315 P φ External clock input pin TCNT input clock TCNT N + 1 N N – 1 Figure 11.5 Count Timing when External Clock Is Operating (Both Edges Detected) • On-Chip RTC Clock Operation: Set the TPSC2–TPSC0 bits in TCR to select the on-chip RTC clock as the timer clock. Figure 11.6 shows the timing. RTC output clock TCNT TCNT input clock N + 1 N N – 1 Figure 11.6 Count Timing when On-Chip RTC Clock Is Operating Input Capture Function: Channel 2 has an input capture function (figure 11.7). When using the input capture function, set the TCLK pin to input mode with the TCOE bit in the timer output control register (TOCR) and set the timer operation clock to internal clock or on-chip RTC clock with the TPCS2–TPCS0 bits in the timer control register (TCR). Also, designate use of the input capture function and whether to generate interrupts on using it with the IPCE1–IPCE0 bits in TCR, and designate the use of either the rising or falling edge of the TCLK pin to set the timer counter (TNCT) value into the input capture register (TCPR) with the CKEG1–CKEG0 bits in TCR. The input capture function cannot be used in standby mode. |
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