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H8/3021 Datasheet(PDF) 527 Page - Renesas Technology Corp |
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H8/3021 Datasheet(HTML) 527 Page - Renesas Technology Corp |
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527 / 712 page  16. Clock Pulse Generator Rev.2.00 Mar. 22, 2007 Page 503 of 684 REJ09B0352-0200 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. EXTAL XTAL CL1 CL2 C = C = 10 pF to 22 pF L1 L2 Rd Figure 16.2 Connection of Crystal Resonator (Example) Table 16.1 Damping Resistance Value (Example) Frequency (MHz) 2 4 8 10 12 16 18 Rd ( Ω) 1 k 500 200 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. XTAL LRs CL CO EXTAL AT-cut parallel-resonance type Figure 16.3 Crystal Resonator Equivalent Circuit |
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