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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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H8SX/1663 데이터시트(PDF) 1016 Page - Renesas Technology Corp |
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H8SX/1663 데이터시트(HTML) 1016 Page - Renesas Technology Corp |
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1016 / 1158 page  Section 22 Clock Pulse Generator Rev.1.00 Jun. 07, 2006 Page 964 of 1102 REJ09B0294-0100 Figure 22.3 shows an equivalent circuit of the crystal resonator. Use a crystal resonator that has the characteristics shown in table 22.3. XTAL CL AT-cut parallel-resonance type EXTAL C0 LRs Figure 22.3 Crystal Resonator Equivalent Circuit Table 22.3 Crystal Resonator Characteristics Frequency (MHz) 8 12 16 18 R S Max. (Ω) 80 60 50 40 C 0 Max. (pF) 7 22.2.2 External Clock Input An external clock signal can be input as the examples in Figure 22.4. When the XTAL pin is left open, make the parasitic capacitance less than 10 pF. When the counter clock is input to the XTAL pin, put the external clock in high level during standby mode. EXTAL XTAL External clock input Open (a) XTAL pin left open EXTAL XTAL External clock input (b) Counter clock input on XTAL pin Figure 22.4 External Clock Input (Examples) |
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