I got confused. The setting for internal OSC actually works. The actual problem is the PIC doesn't response to delay routine. I try to make a LED blinks by turning on the LED, delay and turn off, and repeat.But the LED just stays on all the time. But if I use the simulator and put a stop watch on to monitor the time delay, it actual shows the delay function is working (delay time is about half second).
I 've tried using internal and external OSC, same result.
I still think the settup in the configuration still not right.
Please help....