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ATMEGA8535-16PC Datasheet(PDF) 26 Page - ATMEL Corporation |
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ATMEGA8535-16PC Datasheet(HTML) 26 Page - ATMEL Corporation |
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26 / 321 page  26 ATmega8535(L) 2502K–AVR–10/06 This mode has a limited frequency range and it can not be used to drive other clock buffers. For resonators, the maximum frequency is 8 MHz with CKOPT unprogrammed and 16 MHz with CKOPT programmed. 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 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. 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. 2. 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(2) 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 - 16.0 12 - 22 XTAL2 XTAL1 GND C2 C1 |
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