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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PPC34C60 датащи(PDF) 33 Page - SMSC Corporation |
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PPC34C60 датащи(HTML) 33 Page - SMSC Corporation |
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33 / 58 page  SMSC DS – PPC34C60 Page 33 Rev. 06/01/2001 ADVANCED INFORMATION SUGGESTED OSCILLATOR CIRCUITS The PPC34C60 requires two frequency sources. The 24MHz clock is supplied with a parallel resonant 24MHz crystal oscillator connected as shown in FIGURE 9. It is important that the board designer place the crystal oscillator close to the PPC34C60 maintaining the shortest possible traces. The 24MHz clock is used by much of the internal circuitry and provides the time base used by the Bus Interface circuitry. The second clock source is provided by an RC circuit and should be connected as shown in FIGURE 10. This clock is used primarily by the Watch Dog Timer and Piezo Driver functional blocks. PPC34C60 Xin Xout 24MHz Crystal 20 pF 20 pF FIGURE 9 - SUGGESTED 24 MHZ OSCILLATOR CIRCUIT FIGURE 10 - SUGGESTED 32 KHZ OSCILLATOR CIRCUIT PPC34C60 Yin Yout R 2.2 K 100 .068 uF |
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