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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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H8SX/1663M 데이터시트(PDF) 1260 Page - Renesas Technology Corp |
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H8SX/1663M 데이터시트(HTML) 1260 Page - Renesas Technology Corp |
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1260 / 1504 page  Section 27 Clock Pulse Generator Rev. 2.00 Sep. 24, 2008 Page 1228 of 1468 REJ09B0412-0200 Table 27.3 Crystal Resonator Characteristics Frequency (MHz) 8 12 16 18 R S Max. (Ω) 80 60 50 40 C 0 Max. (pF) 7 27.2.2 External Clock Input An external clock signal can be input as the examples in Figure 27.4. 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 27.4 External Clock Input (Examples) EXTAL t EXH t EXL t EXr t EXf Vcc × 0.5 Figure 27.5 External Clock Input Timing |
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