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7721 Datasheet(PDF) 79 Page - Renesas Technology Corp |
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7721 Datasheet(HTML) 79 Page - Renesas Technology Corp |
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79 / 577 page  CLOCK GENERATING CIRCUIT 7721 Group User’s Manual 5–2 5.1 Oscillation circuit examples To the oscillation circuit, a ceramic resonator or a quartz-crystal oscillator can be connected, or the clock which is externally generated can be input. Oscillation circuit examples are shown below. 5.1.1 Connection example using resonator/oscillator Figure 5.1.1 shows an example when connecting a ceramic resonator/quartz-crystal oscillator between pins XIN and XOUT. The circuit constants such as Rf, Rd, CIN, and COUT (shown in “Figure 5.1.1”) depend on the resonator/ oscillator. These values shall be set to the values recommended by the resonator/oscillator manufacturer. 5.1.2 Externally generated clock input example Figure 5.1.2 shows an input example of the clock which is externally generated. The external clock must be input from the XIN pin, and the XOUT pin must be left open. 5.1 Oscillation circuit examples Fig. 5.1.1 Connection example using resonator/oscillator Fig. 5.1.2 Externally generated clock input example M37721 XIN XOUT Rf CIN COUT Rd M37721 XIN XOUT Vcc Vss Externally generated clock Open |
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