When i add the ISD module to my fine project,L5 error popups at building target file. I believe that it can not be simply overlooked in that the overlap occurs in the code space memory. I am not very familiar with Keil C and do not know how to adjust the source code or compiler's configuration. Anybody here can offer me some advice? BTW, the program size: data=10.1,xdata=0,code=1083 For LPC922, it has spacious code memory for compiler to work around.