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H8S2245 Datasheet(PDF) 588 Page - Renesas Technology Corp |
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H8S2245 Datasheet(HTML) 588 Page - Renesas Technology Corp |
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588 / 818 page  Section 17 Clock Pulse Generator Rev.3.00 Mar. 26, 2007 Page 546 of 772 REJ09B0355-0300 of the oscillator's built-in feedback resistor and duty adjustment circuit. Software standby mode should then be exited by means of an external interrupt. Bit 5 RFCUT Description 0 Oscillator's built-in feedback resistor and duty adjustment circuit are used (Initial value) 1 Oscillator's built-in feedback resistor and duty adjustment circuit are not used Bits 4 to 0—Reserved: These bits can be read or written to, but do not affect operation. 17.3 Oscillator Clock pulses can be supplied by connecting a crystal resonator, or by input of an external clock. 17.3.1 Connecting a Crystal Resonator Circuit Configuration A crystal resonator can be connected as shown in the example in figure 17.2. Select the damping resistance R d according to table 17.2. An AT-cut parallel-resonance crystal should be used. EXTAL XTAL Rd CL2 CL1 CL1 = CL2 = 10 to 22 pF Figure 17.2 Connection of Crystal Resonator (Example) Table 17.2 Damping Resistance Value Frequency (MHz) 24812 16 20 R d (Ω Ω Ω Ω) 1 k 500 200 0 0 0 |
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