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SH7021 Datasheet(PDF) 108 Page - Renesas Technology Corp |
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SH7021 Datasheet(HTML) 108 Page - Renesas Technology Corp |
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108 / 509 page  90 RENESAS XTAL EXTAL C L1 = CL2 = IC–22 pF C L1 C L2 Rd Figure 7.2 Connection of the Crystal Resonator (Example) Table 7.1 Damping Resistance Frequency [MHz] 24812 16 20 Rd [ Ω] 1k 500 200 0 0 0 Crystal Resonator: Figure 7.3 shows an equivalent circuit of the crystal resonator. Use a crystal resonator with the characteristics listed in table 7.2. C 0 XTAL EXTAL C L LRs Figure 7.3 Crystal Resonator Equivalent Circuit Table 7.2 Crystal Resonator Parameters Frequency (MHz) Parameter 2 4 8 12 16 20 Rs max [ Ω] 500 120 80 60 50 40 Co max [pF] 7 7 7 7 7 7 Value to be determined (TBD) 7.2.2 External Clock Input An external clock signal can be input at the EXTAL pin as shown in figure 7.6. The XTAL pin should be left open. The frequency must be equal to the system clock (CK) frequency. The specifications for the waveform of the external clock input are given below. Make the external clock frequency the same as the system clock (CK). |
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