How to implement hybrid programming for C51 and assembly

The compiler used in this article is Keil
The first is an example, and from this example unfolds the description:
......//c51 Code Here
#pragma ASM
.....//here is the the assembler Code.
#pragma endasm
......//c51 Code Here

Oh, in fact, C51 and assembly of mixed programming is just such a thing.
But we also have to do some premise work, first in the Project window containing assembly code (ASM) C file Right-click, select "Options for ...", and then click "Generate assembler src File" and "Assemble SRC File "

According to the selected compilation mode, the corresponding library files are added to the project, it should be noted that this file must be the last file of the project

        is a complete routine
#i nclude <reg51.h>
void main (void)
{
     p2=1;
     #pragma asm
          MOV R7, #10
& nbsp;    Del:mov R6, #20
          DJNZ r6,$
          DJNZ r7,del
     #pragma endasm
     p2=0;
}