Hallo I want to establish a bus communication between the C167 and a peripheral circuit. E.g. I want to write the Number 17 to the address 0x100000. I have written a header file myheader.h with the following content: " #define reg0 0x100000" In the .C programm I have included this header file #include<myheader.h>. Problem: I can not write a value to reg0. When I'm writing reg0=17; in the .C programm then I get the error massage C100. Please help me! Thank you