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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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H8S/2218 数据表(PDF) 651 Page - Renesas Technology Corp |
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H8S/2218 数据表(HTML) 651 Page - Renesas Technology Corp |
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651 / 750 page  Section 19 Clock Pulse Generator Rev.6.00 Jun. 03, 2008 Page 603 of 698 REJ09B0074-0600 19.6 Subclock Oscillator 19.6.1 Connecting 32.768-kHz Crystal Resonator supply a clock to the subclock divider, connect a 32.768-kHz crystal resonator, as shown in figure 19.6. Figure 19.7 shows the equivalence circuit for a 32.768-kHz oscillator. OSC1 OSC2 Note: C 1 and C2 are reference values including the floating capacitance of the board. C 1 C 2 C 1 = C2 = 15 pF (typ.) Figure 19.6 Example Connection of 32.768-kHz Quartz Oscillator OSC1 OSC2 Cs Ls Rs Co Co = 1.5 pF (typ.) Rs = 14 k Ω (typ.) fw = 32.768 kHz Type name = C001R (SEIKO EPSON) Figure 19.7 Equivalence Circuit for 32.768-kHz Oscillator 19.6.2 Handling Pins when Subclock Not Required If no subclock is required, connect the OSC1 pin to Vss and leave OSC2 open, as shown in figure 19.8. Set the SUBSTP bit of LPWRCR to 1. If this setting is not made, transition to power-down mode may not complete properly in some cases. OSC1 OSC2 Open state Figure 19.8 Pin Handling when Subclock Not Required |
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