Datasheet

30
7593LS–AVR–09/12
AT90USB64/128
Problem fix/workaround
No known workaround, enable Atmel AT90USB64/128 TWI first versus the others nodes of
the TWI network.
2. High current consumption in sleep mode
If a pending interrupt cannot wake the part up from the selected mode, the current consump-
tion will increase during sleep when executing the SLEEP instruction directly after a SEI
instruction.
Problem fix/workaround
Before entering sleep, interrupts not used to wake up the part from the sleep mode should
be disabled.
1. Asynchronous timer interrupt wake up from sleep generates multiple interrupts
If the CPU core is in sleep and wakes-up from an asynchronous timer interrupt and then go
back in sleep again it may wake up multiple times.
Problem fix/workaround
A softw are w orkaround is to w ait w ith performing the sleep instruction until
TCNT2>OCR2+1.