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H8S/2240 数据表(PDF) 590 Page - Renesas Technology Corp |
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H8S/2240 数据表(HTML) 590 Page - Renesas Technology Corp |
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590 / 818 page ![]() Section 17 Clock Pulse Generator Rev.3.00 Mar. 26, 2007 Page 548 of 772 REJ09B0355-0300 17.3.2 External Clock Input Circuit Configuration An external clock signal can be input as shown in the examples in figure 17.5. If the XTAL pin is left open, make sure that stray capacitance is no more than 10 pF. In example (b), make sure that the external clock is held high in standby mode. EXTAL XTAL External clock input Open (a) XTAL pin left open EXTAL XTAL External clock input (b) Complementary clock input at XTAL pin Figure 17.5 External Clock Input (Examples) |
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