Datasheet

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ATmega169A/PA/329A/PA/649A/P/3290A/PA/6490A/P [SUMMARY]
8284ES–AVR–02/2013
9.9 Atmel ATmega3290A/3290PA 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
The interrupt will be lost if a timer register that is synchronous timer clock is written when the asynchronous
Timer/Counter register (TCNTx) is 0x00.
Problem Fix/ Workaround
Always check that the asynchronous Timer/Counter register neither have the value 0xFF nor 0x00 before writ-
ing to the asynchronous Timer Control Register (TCCRx), asynchronous Timer Counter Register (TCNTx), or
asynchronous Output Compare Register (OCRx).
9.10 Atmel ATmega649A/649P/ATmega6490A/6490P
No known errata.