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gentlemen,thing is as following: in Cmnd.c file, a struct is defined: typedef struct { unsigned char arg1; unsigned char arg2; unsigned char arg3; unsigned int arg4; unsigned int arg5; }para; and then three para type variables: para data Strt1,Strt2,Strt3; and I have 2 place where the para type variables are accessed. in Reset.c file,three routines: ResetParse(para data*data StructPtr); ColdReset(para data*data StructPtr); HotReset(para data*data StructPtr); compile,pass. but in another file Cmnd.c where the para is defined. It just doesnt work:( the routine ExeCmnd(uint len,uchar xdata*data Cmnd,para data*data StructPtr); compile,an err occurs;( CMND.C(24): error C141: syntax error near 'data', expected ')' and if I change it to this: ExeCmnd(uint len,uchar xdata*data Cmnd,uchar data*data StuctPtr); compile,done! faint,anybody help me,and tell me what's going on:( I thought it was probably coz there are too many parameters than 3 parameters that couldb be passed thru registers,but I change parameters number,not yet work:(, then I come here for help, the basic project setup is: mcu: Ram 256, large mode, and nothing special; thanks in advance:) ---going to mad:(