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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATmega328P датащи(PDF) 30 Page - ATMEL Corporation |
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ATmega328P датащи(HTML) 30 Page - ATMEL Corporation |
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30 / 345 page  30 7810A–AVR–11/09 ATmega328P [Preliminary] Figure 8-3. Crystal Oscillator Connections Notes: 1. These options should only be used when not operating close to the maximum frequency of the device, and only if frequency stability at start-up is not important for the application. These options are not suitable for crystals. 2. These options are intended for use with ceramic resonators and will ensure frequency stability at start-up. They can also be used with crystals when not operating close to the maximum fre- quency of the device, and if frequency stability at start-up is not important for the application. Table 8-6. Start-up Times for the Full Swing Crystal Oscillator Clock Selection Oscillator Source / Power Conditions Start-up Time from Power-down and Power-save Additional Delay from Reset (VCC = 5.0V) CKSEL0 SUT1..0 Ceramic resonator, fast rising power 258 CK 14CK + 4.1 ms(1) 000 Ceramic resonator, slowly rising power 258 CK 14CK + 65 ms(1) 001 Ceramic resonator, BOD enabled 1K CK 14CK(2) 010 Ceramic resonator, fast rising power 1K CK 14CK + 4.1 ms(2) 011 Ceramic resonator, slowly rising power 1K CK 14CK + 65 ms(2) 100 Crystal Oscillator, BOD enabled 16K CK 14CK 1 01 Crystal Oscillator, fast rising power 16K CK 14CK + 4.1 ms 1 10 Crystal Oscillator, slowly rising power 16K CK 14CK + 65 ms 1 11 XTAL2 (TOSC2) XTAL1 (TOSC1) GND C2 C1 |
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