ATmega325P datasheet(355/364 Pages) ATMEL

355 / 364 page

355

8023F–AVR–07/09

ATmega325P/3250P

32.4

ATmega3250P rev. A

• Interrupts may be lost when writing the timer registers in the asynchronous timer.

• Using BOD disable will make the chip reset.

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).

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

32.5

ATmega3250P rev. B

• Interrupts may be lost when writing the timer registers in the asynchronous timer.

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).

32.6

ATmega3250P rev. C

• Interrupts may be lost when writing the timer registers in the asynchronous timer.

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).

ATmega325P Datasheet(PDF) 355 Page - ATMEL Corporation