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UPD17708 Datasheet(PDF) 353 Page - Renesas Technology Corp |
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UPD17708 Datasheet(HTML) 353 Page - Renesas Technology Corp |
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353 / 358 page  351 µPD17704, 17705, 17707, 17708, 17709 APPENDIX A. CAUTIONS ON CONNECTING CRYSTAL RESONATOR When using the system clock oscillation circuit, wire the portion enclosed by the dotted line in the figure below as follows to prevent adverse influence from wiring capacity. • Keep the wiring length as short as possible. • If capacitances C1 and C2 are too high, the oscillation start characteristics may be degraded or current consumption may increase. • Generally, connect a trimmer capacitor for adjusting the oscillation frequency to the XIN pin. Depending on the crystal resonator to be used, however, the oscillation stability differs. Therefore, evaluate the crystal resonator actually used. • The crystal oscillation frequency cannot be accurately adjusted when an emulation probe is connected to the XOUT and XIN pin, because of the capacitance of the probe. Adjust the frequency while measuring the VCO oscillation frequency. PD17709 4.5-MHz crystal resonator C1 C2 XOUT XIN µ |
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