ATMEGA168V-10MI【PDF 16/36 页】IC AVR MCU 16K 10MHZ 32-QFN

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Sheet目录3834

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2545TS–AVR–05/11

ATmega48/88/168

11. Errata

11.1

Errata Atmel ATmega48

The revision letter in this section refers to the revision of the ATmega48 device.

11.1.1

Rev. D

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).

11.1.2

Rev. C

Reading EEPROM when system clock frequency is below 900kHz may not work

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

Reading EEPROM when system clock frequency is below 900kHz may not work

Reading Data from the EEPROM at system clock frequency below 900kHz may result in

wrong data read.

Problem fix/workaround

Avoid using the EEPROM at clock frequency below 900kHz.

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).

11.1.3

Rev. B

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).

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