ATMEGA325P_09 Datasheet, PDF (23/25 Pages) ATMEL Corporation – 8-bit Microcontroller with 32K Bytes In-System Programmable Flash

ATmega325P/3250P
32. Errata
32.1 ATmega325P rev. A
• Interrupts may be lost when writing the timer registers in the asynchronous timer.
• Using BOD disable will make the chip reset.
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 writing to the asynchronous Timer Control Register (TCCRx), asynchronous
Timer Counter Register (TCNTx), or asynchronous Output Compare Register (OCRx).
2. Using BOD disable will make the chip reset.
If the part enters sleep with the BOD turned off with the BOD disable option
enabled, a BOD reset will be generated at wakeup and the chip will reset.
Problem Fix/Workaround
Do not use BOD disable
32.2 ATmega325P rev. B
• 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 writing to the asynchronous Timer Control Register (TCCRx), asynchronous
Timer Counter Register (TCNTx), or asynchronous Output Compare Register (OCRx).
32.3 ATmega325P 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/Workoround
Always check that the asynchronous Timer/Counter register neither have the value 0xFF nor
0x00 before writing to the asynchronous Timer Control Register (TCCRx), asynchronous
Timer Counter Register (TCNTx), or asynchronous Output Compare Register (OCRx).
8023FS–AVR–07/09
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