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Errata

12. Wake-up from Power Save Executes Instructions before Interrupt

When waking up from power save, some instructions are executed before the

interrupt is called. If the device is woken up by an external interrupt, 2 instruction

cycles are executed. If it is woken up by the asynchronous timer, 3 instructions

are executed before the interrupt.

Problem Fix/Workaround

Make sure that the first two or three instructions following sleep are not dependent

on the executed interrupt.

11. The SPI can Send Wrong Byte

If the SPI is in Master mode, it will restart the old transfer if new data is written on

the same clock edge as the previous transfer is finished.

Problem Fix/Workaround

When writing to the SPI, first wait until it is ready, then write the byte to transmit.

10. Wrong Clearing of EXTRF in MCUSR

The EXTRF flag in MCUSR will be cleared when clearing the PORF-flag. The flag

does not get cleared by writing a “0” to it.

Problem Fix/Workaround

Finish the test of both flags before clearing any of them. Clear both flags simulta-

neously by writing “0” to both PORF and EXTRF in MCUCR.

9.

Reset during EEPROM Write

If reset is activated during EEPROM write, the result is not what should be

expected. The EEPROM write cycle completes as normal, but the address regis-

ters are reset to 0. The result is that both the address written and address 0 in the

EEPROM can be corrupted.

Problem Fix/Workaround

Avoid using address 0 for storage, unless you can guarantee that you will not get

a reset during EEPROM write.

8-bit

Microcontroller

with 128K Bytes

In-System

Programmable

Flash

ATmega103L

Rev. F/G

Errata Sheet

Rev. 1197D–12/99