Special Considerations
Even though the ICE200 is highly accurate in it's emulation of the AVR devices it is supporting, there are some differences worth noticing. Most of these differences apply to the ability of controlling the program flow i.e. single stepping and so on. Program flow control is an extension to the normal functions of the microcontroller that allows the user to do the debugging. This extension must not interfere with the normal program execution (run mode). If the program execution is stopped (stopped mode) and then restarted, or the program is executed line by line (single-stepping), the program functionality can, in some cases, be affected.

See Also