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H8/3003 数据表(PDF) 525 Page - Renesas Technology Corp |
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H8/3003 数据表(HTML) 525 Page - Renesas Technology Corp |
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525 / 715 page  Table 16-2 Crystal Resonator Parameters Frequency (MHz) 24810 12 16 20 24 Rs max ( Ω) 500 120 80 70 60 50 40 40 Co (pF) 7 pF max Clock-Halving Version: Use a crystal resonator with a frequency equal to twice the system clock frequency (ø). 1:1 Version: Use a crystal resonator with a frequency equal to the system clock frequency (ø). Notes on Board Design: When a crystal resonator is connected, the following points should be noted: Other signal lines should be routed away from the oscillator circuit to prevent induction from interfering with correct oscillation. See figure 16-4. When the board is designed, the crystal resonator and its load capacitors should be placed as close as possible to the XTAL and EXTAL pins. Figure 16-4 Example of Incorrect Board Design XTAL EXTAL CL2 CL1 H8/3003 Avoid Signal A Signal B 507 |
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