Rainbow-electronics ATmega3290P_V Instrukcja Użytkownika Pobierz pdf (Strona 366)

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ATmega329/3290/649/6490

2552H–AVR–11/06

ATmega649 rev. A

• Interrupts may be lost when writing the timer registers in the asynchronous timer

1. Interrupts may be lost when writing the timer registers in the asynchronous

timer

If one of the timer registers which is synchronized to the asynchronous timer2 clock

is written in the cycle before a overflow interrupt occurs, the interrupt may be lost.

Problem Fix/Wortkaround

Always check that the Timer2 Timer/Counter register, TCNT2, does not have the

value 0xFF before writing the Timer2 Control Register, TCCR2, or Output Compare

ATmega6490 rev. A

• Interrupts may be lost when writing the timer registers in the asynchronous timer

1. Interrupts may be lost when writing the timer registers in the asynchronous

timer

If one of the timer registers which is synchronized to the asynchronous timer2 clock

is written in the cycle before a overflow interrupt occurs, the interrupt may be lost.

Problem Fix/Wortkaround

Always check that the Timer2 Timer/Counter register, TCNT2, does not have the

value 0xFF before writing the Timer2 Control Register, TCCR2, or Output Compare

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