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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SH7124 датащи(PDF) 86 Page - Renesas Technology Corp |
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SH7124 датащи(HTML) 86 Page - Renesas Technology Corp |
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86 / 782 page  Section 4 Clock Pulse Generator (CPG) Rev. 3.00 Sep. 27, 2007 Page 66 of 758 REJ09B0243-0300 4.6 Oscillator Clock pulses can be supplied from a connected crystal resonator or an external clock. 4.6.1 Connecting Crystal Resonator A crystal resonator can be connected as shown in figure 4.2. Use the damping resistance (Rd) listed in table 4.6. Use a crystal resonator that has a resonance frequency of 10 to 12.5 MHz. It is recommended to consult the crystal resonator manufacturer concerning the compatibility of the crystal resonator and the LSI. EXTAL XTAL Rd CL2 CL1 CL1 = CL2 = 18 to 22 pF (Reference values) Figure 4.2 Connection of Crystal Resonator (Example) Table 4.6 Damping Resistance Values (Reference Values) Frequency (MHz) 10 12.5 Rd ( Ω) (Reference Values) 0 0 Figure 4.3 shows an equivalent circuit of the crystal resonator. Use a crystal resonator with the characteristics listed in table 4.7. XTAL CL EXTAL C0 L Rs Figure 4.3 Crystal Resonator Equivalent Circuit |
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