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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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H8S/2214 Scheda tecnica(PDF) 673 Page - Renesas Technology Corp |
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H8S/2214 Scheda tecnica(HTML) 673 Page - Renesas Technology Corp |
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673 / 936 page  Section 16 Clock Pulse Generator Rev.4.00 Sep. 18, 2008 Page 613 of 872 REJ09B0189-0400 (3) Note on Switchover of External Clock When two or more external clocks (e.g. 10 MHz and 2 MHz) are used as the system clock, switchover of the input clock should be carried out in software standby mode. An example of an external clock switching circuit is shown in figure 16.7, and an example of the external clock switchover timing in figure 16.8. External clock 1 External clock 2 External clock switchover request External interrupt signal External clock switchover signal Control circuit Port output External interrupt EXTAL H8S/2214 Group Figure 16.7 Example of External Clock Switching Circuit |
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