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SH7052 Datasheet(PDF) 84 Page - Renesas Technology Corp |
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SH7052 Datasheet(HTML) 84 Page - Renesas Technology Corp |
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84 / 919 page  58 Table 4.3 Damping Resistance Values (Recommended Values) Frequency (MHz) Parameter 5 10 Rd ( Ω) 500 0 Crystal Oscillator: Figure 4.4 shows an equivalent circuit of the crystal oscillator. Use a crystal oscillator with the characteristics listed in table 4.4. C0 EXTAL CL LRs XTAL Figure 4.4 Crystal Oscillator Equivalent Circuit Table 4.4 Crystal Oscillator Parameters (Recommended Values) Frequency (MHz) Parameter 5 10 Rs max ( Ω) 100 50 C0 max (pF) 7 7 The crystal oscillator manufacturer should be consulted concerning the compatibility between the crystal oscillator and the chip. 4.3.2 External Clock Input Method An example of external clock input connection is shown in figure 4.5. When the XTAL pin is placed in the open state, the parasitic capacitance should be 10 pF or less. Even when an external clock is input, provide for a wait of at least the oscillation settling time when powering on or exiting standby mode in order to secure the PLL settling time. |
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