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SH7018 Datasheet(PDF) 62 Page - Renesas Technology Corp |
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SH7018 Datasheet(HTML) 62 Page - Renesas Technology Corp |
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62 / 431 page  46 Notes on Duty Adjustment: Duty adjustment circuit is performed on an input clock of 5 MHz or higher. With a frequency of less than 5 MHz, duty adjustment may not be performed, but AC characteristics t CH (clock high-level width) and tCL (clock low-level width) are satisfied, and there is no problem with SH7018 internal operation. Figure 4.6 shows the basic characteristics of the duty adjustment circuit. The duty adjustment circuit does not correct for transient fluctuations or jitter in the input clock. Thus, several tens of µs are required until duty adjustment is performed and a stable clock is obtained. 30 40 50 60 70 70 60 50 40 30 15 Input duty Input frequency (MHz) 210 20 Figure 4.6 Duty Adjustment Circuit Characteristics |
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