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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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SH7052 데이터시트(PDF) 85 Page - Renesas Technology Corp |
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SH7052 데이터시트(HTML) 85 Page - Renesas Technology Corp |
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85 / 919 page  59 XTAL EXTAL Open External clock input Figure 4.5 External Clock Input Method (Example) 4.4 Usage Notes Notes on Board Design: When connecting a crystal oscillator, observe the following precautions: • To prevent induction from interfering with correct oscillation, do not route any signal lines near the oscillator circuitry (figure 4.6). • When designing the board, place the crystal oscillator and its load capacitors as close as possible to the XTAL and EXTAL pins. Figure 4.6 shows the precautions regarding oscillator circuit system board design. Crossing of signal lines prohibited CL1 XTAL EXTAL CL2 Figure 4.6 Precautions for Oscillator Circuit System Board Design PLL Oscillation Power Supply: Place oscillation capacitor C1 and resistor R1 close to the PLL CAP pin, and ensure that no other signal lines cross this line. Supply the C1 ground from PLLV SS. Separate PLLV CC and PLLVSS from the other VCC and VSS lines at the board power supply source, and be sure to insert bypass capacitors C PB and CB close to the pins. |
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