#warning Header file pic18f452.h included directly. Use #include <htc.h> instead.调用的头文件中开头为以下代码,不知道什么意思?
#ifndef _PIC18F452_H_
#define _PIC18F452_H_
/*
* C Header file for the Microchip PIC Microcontroller
* PIC18F452
*/
#ifndef _HTC_H_
#warning Header file pic18f452.h included directly. Use #include <htc.h> instead.
#endif
求大神解释一下。
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