diff --git a/inc/osc_configuration.h b/inc/osc_configuration.h
new file mode 100644
index 0000000..b975c4c
--- /dev/null
+++ b/inc/osc_configuration.h
@@ -0,0 +1,6 @@
+#ifndef _OSC_CONFIGURATION_
+#define _OSC_CONFIGURATION_
+
+void osc_init();
+
+#endif
\ No newline at end of file
diff --git a/src/osc_configuration.c b/src/osc_configuration.c
new file mode 100644
index 0000000..abc2fa1
--- /dev/null
+++ b/src/osc_configuration.c
@@ -0,0 +1,23 @@
+#include "BA45F5250.h"
+#include "stdint.h"
+#include "build-in.h"
+#include "osc_configuration.h"
+#include "macro_define.h"
+
+void osc_init()
+{
+	// Control system clock
+    _scc = 0b00000000;
+
+    // Control HIRC clock
+    #if _HIRCC_8M
+        _hircc = 0b00001001;
+    #elif _HIRCC_4M
+        _hircc = 0b00000101;
+    #else
+        _hircc = 0b00000001;
+    #endif
+
+    // Control watchdog timer
+    _wdtc = 0b01010111;
+}
\ No newline at end of file