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ATMEGA325P Folha de dados(PDF) 33 Page - ATMEL Corporation |
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ATMEGA325P Folha de dados(HTML) 33 Page - ATMEL Corporation |
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33 / 336 page  33 8023A–AVR–12/06 ATmega325P/3250P Figure 7-3. Crystal Oscillator Connections Table 7-6. Low-frequency Crystal Oscillator Internal load Capacitance Crystals specifying load capacitance (CL) higher than 6 pF, require external capacitors applied as described in Figure 7-2 on page 31. To find suitable load capacitance for a 32.768 kHz crystal, please consult the crystal datasheet. The Low-frequency Crystal Oscillator must be selected by setting the CKSEL Fuses to “0110” or “0111” as shown in Table 7-8. Start-up times are determined by the SUT Fuses as shown in Table 7-7. Note: 1. This option should only be used if frequency stability at start-up is not important for the application 7.6 Calibrated Internal RC Oscillator By default, the Internal RC Oscillator provides an approximate 8 MHz clock. Though voltage and temperature dependent, this clock can be very accurately calibrated by the user. See Table 25-1 on page 308 for more details. The device is shipped with the CKDIV8 Fuse programmed. See ”System Clock Prescaler” on page 36 for more details. This clock may be selected as the system clock by programming the CKSEL Fuses as shown in Table 7-9 on page 34. If selected, it will operate with no external components. During reset, hardware loads the pre-programmed calibration value into the OSCCAL Register and thereby Min. (pF) Typ. (pF) Max. (pF) TBD 6 TBD Table 7-7. Start-up Times for the Low-frequency Crystal Oscillator Clock Selection SUT1..0 Additional Delay from Reset (VCC = 5.0V) Recommended Usage 00 4 CK Fast rising power or BOD enabled 01 4 CK + 4.1 ms Slowly rising power 10 4 CK + 65 ms Stable frequency at start-up 11 Reserved Table 7-8. Start-up Times for the Low-frequency Crystal Oscillator Clock Selection CKSEL3..0 Start-up Time from Power-down and Power-save Recommended Usage 0110(1) 1K CK 0111 32K CK Stable frequency at start-up XTAL2 (TOSC2) XTAL1 (TOSC1) |
Nº de peça semelhante - ATMEGA325P_06 |
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Descrição semelhante - ATMEGA325P_06 |
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