用MPLAB IDE编程时，软件总是弹出一个窗口提示：
“the extended cpu mode configuration bit is enabled,but the program that was loaded was not built using extended cpu instructions.
therefore,your code may not work properly.”
怎么办？
在main函数前加一句伪指令:#pragma config XINST=OFF即可。
原文：http://www.cnblogs.com/jinxueHou/p/6708339.html