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H8/3003 Datasheet(PDF) 524 Page - Renesas Technology Corp |
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H8/3003 Datasheet(HTML) 524 Page - Renesas Technology Corp |
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524 / 715 page  16.2 Oscillator Circuit Clock pulses can be supplied by connecting a crystal resonator, or by input of an external clock signal. 16.2.1 Connecting a Crystal Resonator Circuit Configuration: A crystal resonator can be connected as in the example in figure 16-2. The damping resistance Rd should be selected according to table 16-1. An AT-cut parallel- resonance crystal should be used. Figure 16-2 Connection of Crystal Resonator (Example) Table 16-1 Damping Resistance Value Frequency (MHz) 2 4 8 10 12 16 20 24 Rd ( Ω) 1 k 500 200 70 0 0 0 0 Crystal Resonator: Figure 16-3 shows an equivalent circuit of the crystal resonator. The crystal resonator should have the characteristics listed in table 16-2. Figure 16-3 Crystal Resonator Equivalent Circuit EXTAL XTAL CL1 CL2 C = C = 10 pF to 22 pF L1 L2 XTAL LRs CL CO EXTAL AT-cut parallel-resonance type 506 |
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