ATMEGA329 データシートの表示（PDF） - Atmel Corporation

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ATMEGA329

8-bit Microcontroller with In-System Programmable Flash

Atmel Corporation 

35.3 ATmega649

35.3.1

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 writ-

ten 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 Register, OCR2.

35.4 ATmega6490

35.4.1

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 writ-

ten 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 Register, OCR2.

382 ATmega329/3290/649/6490

2552J–AVR–08/07

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