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SH7243 Datasheet(PDF) 119 Page - Renesas Technology Corp |
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SH7243 Datasheet(HTML) 119 Page - Renesas Technology Corp |
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119 / 1726 page  Section 4 Clock Pulse Generator (CPG) Rev. 1.00 Jun. 26, 2008 Page 89 of 1692 REJ09B0393-0100 Table 4.6 Crystal Resonator Characteristics Frequency (MHz) 10 12.5 R s max. (Ω) (reference value) 60 50 C 0 max. (pF) (reference value) 7 7 4.6.2 External Clock Input Method Figure 4.4 shows an example of an external clock input connection. Drive the external clock high when it is stopped in software standby mode. During operation, input an external clock with a frequency of 10 to 12.5 MHz. Make sure the parasitic capacitance of the XTAL pin is 10 pF or less. Even when inputting an external clock, be sure to wait at least for the oscillation settling time in power-on sequence or in canceling software standby mode, in order to ensure the PLL settling time. EXTAL XTAL External clock input Open state Figure 4.4 Example of External Clock Connection |
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