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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SH7041A датащи(PDF) 120 Page - Renesas Technology Corp |
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SH7041A датащи(HTML) 120 Page - Renesas Technology Corp |
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120 / 923 page  82 XTAL EXTAL C L1 C L2 Rd 4–10 MHz C L1 = CL2 = 18–22 pF (Recommended value) Figure 4.2 Connection of the Crystal Oscillator (Example) Table 4.1 Damping Resistance Values (Recommended Values) Frequency (MHz) Parameter 4 8 10 Rd ( Ω) 500 200 0 Crystal Oscillator: Figure 4.3 shows an equivalent circuit of the crystal oscillator. Use a crystal oscillator with the characteristics listed in table 4.2. Co EXTAL C L LRs XTAL Figure 4.3 Crystal Oscillator Equivalent Circuit Table 4.2 Crystal Oscillator Parameters Frequency (MHz) Parameter 4 8 10 Rs max ( Ω) 120 80 60 Co max (pF) 7 7 7 4.2.2 External Clock Input Method Figure 4.4 shows an example of an external clock input connection. In this case, make the external clock high level to stop it when in standby mode. During operation, make the external input clock frequency 4–10 MHz. |
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