23

8021AS–AVR–12/06

ATmega329P/3290P

9.

Errata

9.1

ATmega329P rev. A

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 writ-

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

Problem Fix/ Workaround

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 Register, OCR2.

9.2

ATmega3290P rev. A

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 writ-

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

Problem Fix/ Workaround

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 Register, OCR2.