hi, i have many function in asm now i start write coading in 'c' & i want to include this routien in my 'c' coading how can i include this routien in 'c'
You can call assembler routines from 'C', and vice-versa - see: http://www.keil.com/support/man/docs/c51/c51_ap_ctoasm.htm
If your existing ASM functions haven't been written to be compatible with C51, you could write a suitable "interface" layer - probably in assembler...
write a 'skeleton' function in C and use the generated assembler as a template.
Erik