i am not sure if the stack is overflow in my project. thank a lot!
In C51.pdf it is said: The contents of the SFR ACC, B, DPH, DPL, and PSW, when required, are saved on the stack at the function invocation time. And I try to analyze stack while enterd ISR function, it make me so comfused. I want to konw what infomation is pushed to stack while enter ISR. thx for you so quickly replies. I am a fresh, i want to study assemble. wu~~~