Stimuli generator from AVR Studio 4 not yet implemented in Atmel Studio 6.1
The simulator settings dialog is not yet implemented (#13412)
xmegaB1, UC3 except UC3A and UC3L, and many tiny/mega devices not yet supported in Atmel Studio 6.1. See "Tools and device support" in the Atmel Studio Introduction.
AT90CAN*/ATmega*C*, AT90USB*/ATmega*U*, AT90PWM*, and ATtiny87/167 devices will never be supported by simulator models, for these devices the 8-bit instruction set simulator will have to be used.
External memory is not supported by simulator (#7570, #9442)
When writing to I/O PORT registers and the port is configured as output, the change may show up immediately in the PIN register, not one cycle delayed as on the real chip (#7188). This only affects the Atmel Studio I/O view, not the execution of programs.
The AVR32 Studio instruction set simulator still not implemented in Atmel Studio 6.1 (#11557).
If the simulated device is put to sleep, single-stepping will not promote the program counter. Like a real device, this state will remain until something wakes it up from sleep. The reason for this behaviour is that the CPU is not executing code when asleep, the alternative would be having the single step hang until the device wakes up, which would hang the entire Atmel Studio until that happens (maybe never).


