Hello, Without interupts, sw is running ok. When I apply the interupts (archEnableInt), the sw is doing crazy stuff - some of the data is overrun, code sections are executed even though it is not supposed to. But, the sw is alive, doing other things it is supposed to!! It behaves as if some code lines are ignored! I check the stack: STACK IS OK. (I filled end-of stack with known data, and checked it - it was not overrun -> no stack overflow) - thanks for the suggestion. I'll appriciate more ideas and suggestions. :-) 10x boaz |