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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATmega169P датащи(PDF) 33 Page - ATMEL Corporation |
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ATmega169P датащи(HTML) 33 Page - ATMEL Corporation |
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33 / 393 page  33 8018N–AVR–08/09 ATmega169P 8.5 Crystal Oscillator XTAL1 and XTAL2 are input and output, respectively, of an inverting amplifier which can be con- figured for use as an On-chip Oscillator, as shown in Figure 8-2. Either a quartz crystal or a ceramic resonator may be used. C1 and C2 should always be equal for both crystals and resonators. The optimal value of the capacitors depends on the crystal or resonator in use, the amount of stray capacitance, and the electromagnetic noise of the environment. Some initial guidelines for choosing capacitors for use with crystals are given in Table 8-5. For ceramic resonators, the capacitor values given by the manufacturer should be used. Figure 8-2. Crystal Oscillator Connections The Oscillator can operate in three different modes, each optimized for a specific frequency range. The operating mode is selected by the fuses CKSEL3:1 as shown in Table 8-5. Notes: 1. This option should not be used with crystals, only with ceramic resonators. Table 8-5. Crystal Oscillator Operating Modes CKSEL3:1 Frequency Range (MHz) Recommended Range for Capacitors C1 and C2 for Use with Crystals (pF) 100(1) 0.4 - 0.9 – 101 0.9 - 3.0 12 - 22 110 3.0 - 8.0 12 - 22 111 8.0 - 12 - 22 XTAL2 (TOSC2) XTAL1 (TOSC1) GND C2 C1 |
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