ATtiny40 RAMDR register cannot be written from Atmel Studio's I/O view. Workaround: write SRAM directly via the
memory view.
Selecting ATtiny10 external clock in simulator will cause Atmel Studio to hang (#9349).
PRR register of ATtiny25/45/85 does not work (#5584, it works with
the other devices having PRR).
ATtiny25/45/85: Watchdog timeout too long (~64 times longer than it should be @1MHz).
System clock prescaler not included in simulator models, writing
CLKPR will not affect system clock. (all devices except
ATtiny10/9/5/4, ATtiny20, ATtiny40)
CLKPR is not updated when debugging if CKDIV8 fuse
is programmed (#10515)