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Документ 2543H–AVR–02/05, стр.22:
Default Clock Source The device is shipped with CKSEL = “0100”, SUT = “10”, and CKDIV8 programmed. The default clock source setting is the Internal RC Oscillator with longest start-up time and an initial system clock prescaling of 8. This default setting ensures that all users can make their desired clock source setting using an In-System or Parallel programmer.
Device Clocking Option CKSEL3..0:
Calibrated Internal RC Oscillator 4MHz: 0010
Calibrated internal RC Oscillator 8MHz: 0100
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