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M306V2EEFS 数据表(PDF) 37 Page - Renesas Technology Corp |
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M306V2EEFS 数据表(HTML) 37 Page - Renesas Technology Corp |
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37 / 271 page ![]() Rev.1.40 Oct 06, 2004 page 37 of 269 M306V2ME-XXXFP, M306V2EEFP Microcomputer (Built-in feedback resistor) XCIN XCOUT Externally derived clock Open Vcc Vss Note: Insert a damping resistor if required. The resistance will vary depending on the oscillator and the oscillation drive capacity setting. Use the value recommended by the maker of the oscillator. When the oscillation drive capacity is set to low, check that oscillation is stable. When being specified to connect a feedback resistor externally by the manufacture, connect a feedback resistor between pins XCIN and XCOUT. Microcomputer (Built-in feedback resistor) XCIN XCOUT (Note) CCIN CCOUT RCd Figure 2.5.2 Examples of sub-clock 2.5.1 Example of Oscillator Circuit Figure 2.5.1 shows some examples of the main clock circuit, one using an oscillator connected to the circuit, and the other one using an externally derived clock for input. Figure 2.5.2 shows some examples of sub-clock circuits, one using an oscillator connected to the circuit, and the other one using an externally derived clock for input. Circuit constants in Figures 2.5.1 and 2.5.2 vary with each oscillator used. Use the values recommended by the manufacturer of your oscillator. Figure 2.5.1 Examples of main clock Microcomputer (Built-in feedback resistor) XIN XOUT Externally derived clock Open Vcc Vss Microcomputer (Built-in feedback resistor) XIN XOUT Rd CIN COUT (Note) Note: Insert a damping resistor if required. The resistance will vary depending on the oscillator and the oscillation drive capacity setting. Use the value recommended by the maker of the oscillator. When the oscillation drive capacity is set to low, check that oscillation is stable. When being specified to connect a feedback resistor externally by the manufacture, connect a feedback resistor between pins XIN and XOUT. |
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