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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATtiny87-15XZ датащи(PDF) 28 Page - ATMEL Corporation |
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ATtiny87-15XZ датащи(HTML) 28 Page - ATMEL Corporation |
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28 / 282 page  28 7728D–AVR–07/09 ATtiny87/ATtiny167 4.2.4 Crystal Oscillator XTAL1 and XTAL2 are input and output, respectively, of an inverting amplifier which can be configured for use as an On-chip Oscillator, as shown in Figure 4-2. 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 4-6. For ceramic resonators, the capacitor values given by the manufacturer should be used. Figure 4-2. Crystal Oscillator Connections The Oscillator can operate in three different modes, each optimized for a specific frequency range. The operating mode is selected by CKSEL3..1 fuses or by CSEL3..1 field as shown in Table 4-6. Notes: 1. Flash Fuse bits. 2. CLKSELR register bits. 3. This option should not be used with crystals, only with ceramic resonators. Table 4-6. Crystal Oscillator Operating Modes CKSEL3..1(1) CSEL3..1(2) Frequency Range (MHz) Recommended Range for Capacitors C1 and C2 for Use with Crystals (pF) 100(3) 0.4 - 0.9 – 101 0.9 - 3.0 12 - 22 110 3.0 - 8.0 12 - 22 111 8.0 - 16.0 12 - 22 XTAL2 XTAL1 GND C2 C1 |
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