here is the solution about the question in thread http://www.keil.com/forum/msgpage.asp?MsgID=4407
;ASM-File 1 ... public SYMBOL SYMBOL equ 5 ...
;ASM-File 2 ... extrn number (SYMBOL) ... mov a,#SYMBOL ...
// C-File ... extern SYMBOL unsigned char myVar; myVar = (unsigned char)&myConst; ...