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ATMEGA325P Folha de dados(PDF) 31 Page - ATMEL Corporation |
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ATMEGA325P Folha de dados(HTML) 31 Page - ATMEL Corporation |
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31 / 336 page  31 8023A–AVR–12/06 ATmega325P/3250P 7.4 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 7-2. 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 7-3. For ceramic resonators, the capacitor values given by the manufacturer should be used. Figure 7-2. 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 7-3. Note: 1. This option should not be used with crystals, only with ceramic resonators. The CKSEL0 Fuse together with the SUT1..0 Fuses select the start-up times as shown in Table 7-4. Table 7-3. 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 Table 7-4. Start-up Times for the Crystal Oscillator Clock Selection CKSEL0 SUT1..0 Start-up Time from Power-down and Power-save Additional Delay from Reset (V CC = 5.0V) Recommended Usage 000 258 CK(1) 14CK + 4.1 ms Ceramic resonator, fast rising power 001 258 CK(1) 14CK + 65 ms Ceramic resonator, slowly rising power 010 1K CK(2) 14CK Ceramic resonator, BOD enabled XTAL2 XTAL1 GND C2 C1 |
Nº de peça semelhante - ATMEGA325P_06 |
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Descrição semelhante - ATMEGA325P_06 |
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