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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATMEGA16 датащи(PDF) 24 Page - ATMEL Corporation |
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ATMEGA16 датащи(HTML) 24 Page - ATMEL Corporation |
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24 / 315 page  24 ATmega16(L) 2466E–AVR–10/02 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 environ- ment. Some initial guidelines for choosing capacitors for use with crystals are given in Table 4. For ceramic resonators, the capacitor values given by the manufacturer should be used. For more information on how to choose capacitors and other details on Oscilla- tor operation, refer to the Multi-purpose Oscillator application note. Figure 12. Crystal Oscillator Connections The Oscillator can operate in three different modes, each optimized for a specific fre- quency range. The operating mode is selected by the fuses CKSEL3..1 as shown in Table 4. Note: 1. This option should not be used with crystals, only with ceramic resonators. Table 4. Crystal Oscillator Operating Modes CKOPT CKSEL3..1 Frequency Range (MHz) Recommended Range for Capacitors C1 and C2 for Use with Crystals (pF) 1 101 (1) 0.4 - 0.9 – 1 110 0.9 - 3.0 12 - 22 1 111 3.0 - 8.0 12 - 22 0 101, 110, 111 1.0 ≤ 12 - 22 XTAL2 XTAL1 GND C2 C1 |
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