diff --git a/inc/macro_define.h b/inc/macro_define.h
new file mode 100644
index 0000000..e3e422d
--- /dev/null
+++ b/inc/macro_define.h
@@ -0,0 +1,8 @@
+#ifndef _MACRO_DEFINE_
+#define _MACRO_DEFINE_
+
+#define _HIRCC_8M 1
+#define _HIRCC_4M 0
+#define _HIRCC_2M 0
+
+#endif
\ No newline at end of file