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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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H8S/2218 数据表(PDF) 654 Page - Renesas Technology Corp |
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H8S/2218 数据表(HTML) 654 Page - Renesas Technology Corp |
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654 / 750 page  Section 19 Clock Pulse Generator Rev.6.00 Jun. 03, 2008 Page 606 of 698 REJ09B0074-0600 This LSI Ouptut port External interrupt EXTAL Request switchover of external clock Interrupted external signal External clock switchover signal External clock 1 External clock 2 Control cycle Figure 19.11 Example of External Clock Switching Circuit 200 ns or more (2) (1) (2) (3) (4) (5) Port setting (clock switchover) Software standby mode transition External clock switchover External interrupt generation (Input interrupt at least 200 ns after transition to software standby mode.) Interrupt exception handling (5) SLEEP instruction execution Interrupt exception handling Operation External clock 1 External clock 2 (1) Port setting (3) External clock switchover signal EXTAL Internal clock φ (4) Wait time External interrupt Active (external clock 2) Software standby mode Active (external clock 1) Clock switchover request Figure 19.12 Example of External Clock Switchover Timing |
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