ATMEGA645V-8MU Ver la hoja de datos (PDF) - Atmel Corporation

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ATMEGA645V-8MU

8-bit Microcontroller with In-System Programmable Flash

Atmel Corporation 

ATmega325/3250/645/6450

10.2.3

ATmega3250 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/ 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.

10.3 Errata ATmega645

The revision letter in this section refers to the revision of the ATmega645 device.

10.3.1

ATmega645 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/ 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.

10.4 Errata ATmega6450

The revision letter in this section refers to the revision of the ATmega6450 device.

10.4.1

ATmega6450 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/ 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.

25

2570LS–AVR–08/07

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