ATMEGA168V-10MI【PDF 19/36 页】IC AVR MCU 16K 10MHZ 32-QFN

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2545TS–AVR–05/11

ATmega48/88/168

11.2

Errata Atmel ATmega88

The revision letter in this section refers to the revision of the ATmega88 device.

11.2.1

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).

11.2.2

Rev. B/C

Not sampled.

11.2.3

Rev. A

Writing to EEPROM does not work at low operating voltages

Part may hang in reset

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

Writing to EEPROM does not work at low operating voltages

Writing to the EEPROM does not work at low voltages.

Problem fix/workaround

Do not write the EEPROM at voltages below 4.5 Volts.

This will be corrected in rev. B.

Part may hang in reset

Some parts may get stuck in a reset state when a reset signal is applied when the internal

reset state-machine is in a specific state. The internal reset state-machine is in this state for

approximately 10ns immediately before the part wakes up after a reset, and in a 10ns win-

dow when altering the system clock prescaler. The problem is most often seen during In-

System Programming of the device. There are theoretical possibilities of this happening also

in run-mode. The following three cases can trigger the device to get stuck in a reset-state:

- Two succeeding resets are applied where the second reset occurs in the 10ns window

before the device is out of the reset-state caused by the first reset.

- A reset is applied in a 10ns window while the system clock prescaler value is updated by

software.

- Leaving SPI-programming mode generates an internal reset signal that can trigger this

case.

The two first cases can occur during normal operating mode, while the last case occurs only

during programming of the device.

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