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ATMEGA645V-8MU

8-bit Microcontroller with In-System Programmable Flash

Atmel Corporation 

10. Errata

10.1 Errata ATmega325

The revision letter in this section refers to the revision of the ATmega325 device.

10.1.1

ATmega325 Rev. C

• 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.

10.1.2

ATmega325 Rev. B

Not sampled.

10.1.3

ATmega325 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.

10.2 Errata ATmega3250

The revision letter in this section refers to the revision of the ATmega3250 device.

10.2.1

ATmega3250 Rev. C

• 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.

10.2.2

ATmega3250 Rev. B

Not sampled.

24 ATmega325/3250/645/6450

2570LS–AVR–08/07

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