STC单片机头文件-stc.h，有了这个头文件就不需要reg51.h、reg52.h之类的头文件了，并且里面包含了STC单片机特有的寄存器如CLK_DIV。-STC SCM header files-stc.h, with this header file does not need reg51.h, reg52.h the class header file, and the STC microcontroller which contains a unique register as CLK