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SH7616 Datasheet(PDF) 138 Page - Renesas Technology Corp |
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SH7616 Datasheet(HTML) 138 Page - Renesas Technology Corp |
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138 / 935 page  Section 3 Oscillator Circuits and Operating Modes Rev. 2.00 Mar 09, 2006 page 112 of 906 REJ09B0292-0200 3.2.3 Connecting a Crystal Resonator Connecting a Crystal Resonator: Figure 3.2 shows an example of crystal resonator connection. The values of damping resistance R and load capacitances CL1 and CL2 should be decided after investigating the components in collaboration with the manufacturer of the crystal oscillator to be used. The crystal resonator should be an AT-cut parallel-oscillator type. Place the crystal resonator and its load capacitors as close as possible to the XTAL and EXTAL pins. Other signal lines should be routed away from the oscillator circuit to prevent induction from interfering with correct oscillation. High level Notes: 1. The CKIO pin is an output in clock modes 0,1, and 2. In mode 3, it is high impedance. 2. The values for CL1, CL2, and the damping resistance should be determined after consultation with the crystal resonator manufacturer. CL1 R CKPREQ/CKM CKIO EXTAL XTAL Output or high impedance CL2 Figure 3.2 Example of Crystal Oscillator Connection |
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