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Atmel ATmega48/88/168 Automotive
33. Errata ATmega48
The revision letter in this section refers to the revision of the ATmega48 device.
33.1
Rev. E
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
If one of the timer registers which is synchronized to the asynchronous timer2 clock is written in
the cycle before an overflow interrupt occurs, the interrupt may be lost.
Problem Fix/Workaround
Always check that the Timer2 Timer/Counter register, TCNT2, does not have the value 0xFF
before writing the Timer2 Control Register, TCCR2, or Output Compare Register, OCR2.
33.2
Rev. D
Interrupts may be lost when writing the timer registers in the asynchronous timer
POR sensitivity with Vcc ramp up from a very low supply voltage
1. Interrupts may be lost when writing the timer registers in the asynchronous timer
If one of the timer registers which is synchronized to the asynchronous timer2 clock is written in
the cycle before an overflow interrupt occurs, the interrupt may be lost.
Problem Fix/Workaround
Always check that the Timer2 Timer/Counter register, TCNT2, does not have the value 0xFF
before writing the Timer2 Control Register, TCCR2, or Output Compare Register, OCR2.
2. POR sensitivity with Vcc ramp up from a very low supply voltage
If Vcc ramp up from a stable 150mV to 300mV plateau, the Power On Reset (POR) may not
reset the device properly.
Problem Fix/Workaround
None.
33.3
Rev. A
Interrupts may be lost when writing the timer registers in the asynchronous timer
POR sensitivity with Vcc ramp up from a very low supply voltage
1. Interrupts may be lost when writing the timer registers in the asynchronous timer
If one of the timer registers which is synchronized to the asynchronous timer2 clock is written in
the cycle before an overflow interrupt occurs, the interrupt may be lost.
Problem Fix/Workaround
Always check that the Timer2 Timer/Counter register, TCNT2, does not have the value 0xFF
before writing the Timer2 Control Register, TCCR2, or Output Compare Register, OCR2.
2. POR sensitivity with Vcc ramp up from a very low supply voltage
If Vcc ramp up from a stable 150mV to 300mV plateau, the Power On Reset (POR) may not
reset the device properly.
鐩搁棞(gu膩n)PDF璩囨枡
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