25

7593GS–AVR–03/08

AT90USB64/128

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 s o ft wa r e wo r k ar o un d i s to w ai t wi t h pe r fo r mi n g th e s l ee p i n st r uc t io n u nt i l

TCNT2>OCR2+1.