How to use c language in multisim for 8051

Multisim is best simulator for electronics circuits and MCU devices with high accuracy. but there is a problem for microcontroller with mutisim, that is they  not give any user manual for 8051 with c language. this post give a basic idea how to use c language in multisim for 805x mcu devices.

Header file: multisim use a different header file for 8051 & 8051 [reg51.h and reg51x.h used in keil ]
 it use htc.h with automatically include 805x.h to your program as need... so use this at top of code.

                          
#include<htc.h>


 you can also use #include<805x.h> but i think htc.h is best. Rest of things is remain same as c language
               



  some of tips for newbies

• use 'unsigned char' instead of char data type 
• use 'unsigned int' instead of  int data type
• use P00 to define port bit instead of P0.0 [ P0.0 is used in asm]
• #define NewPinName P11 to define port bit
• const unsigned char array[ ] to declare array and store it in  ROM . its value should not changed in program else it cause error
• multisim use HI-TECH c compiler and it manual can be find  at C:\Program Files (x86)\HI-TECH Software\HC51\lite\9.60\docs folder [ in windows 7 for me, some where else for you ]

If you face some problem you can contact me or leave a comment