diff --git a/sysmoOCTSIM/config/peripheral_clk_config.h b/sysmoOCTSIM/config/peripheral_clk_config.h
index 8078e4b..c9852b6 100644
--- a/sysmoOCTSIM/config/peripheral_clk_config.h
+++ b/sysmoOCTSIM/config/peripheral_clk_config.h
@@ -12,6 +12,86 @@
 #define CONF_CPU_FREQUENCY 120000000
 #endif
 
+// <y> Core Clock Source
+// <id> core_gclk_selection
+
+// <GCLK_PCHCTRL_GEN_GCLK0_Val"> Generic clock generator 0
+
+// <GCLK_PCHCTRL_GEN_GCLK1_Val"> Generic clock generator 1
+
+// <GCLK_PCHCTRL_GEN_GCLK2_Val"> Generic clock generator 2
+
+// <GCLK_PCHCTRL_GEN_GCLK3_Val"> Generic clock generator 3
+
+// <GCLK_PCHCTRL_GEN_GCLK4_Val"> Generic clock generator 4
+
+// <GCLK_PCHCTRL_GEN_GCLK5_Val"> Generic clock generator 5
+
+// <GCLK_PCHCTRL_GEN_GCLK6_Val"> Generic clock generator 6
+
+// <GCLK_PCHCTRL_GEN_GCLK7_Val"> Generic clock generator 7
+
+// <GCLK_PCHCTRL_GEN_GCLK8_Val"> Generic clock generator 8
+
+// <GCLK_PCHCTRL_GEN_GCLK9_Val"> Generic clock generator 9
+
+// <GCLK_PCHCTRL_GEN_GCLK10_Val"> Generic clock generator 10
+
+// <GCLK_PCHCTRL_GEN_GCLK11_Val"> Generic clock generator 11
+
+// <i> Select the clock source for CORE.
+#ifndef CONF_GCLK_SERCOM2_CORE_SRC
+#define CONF_GCLK_SERCOM2_CORE_SRC GCLK_PCHCTRL_GEN_GCLK2_Val
+#endif
+
+// <y> Slow Clock Source
+// <id> slow_gclk_selection
+
+// <GCLK_PCHCTRL_GEN_GCLK0_Val"> Generic clock generator 0
+
+// <GCLK_PCHCTRL_GEN_GCLK1_Val"> Generic clock generator 1
+
+// <GCLK_PCHCTRL_GEN_GCLK2_Val"> Generic clock generator 2
+
+// <GCLK_PCHCTRL_GEN_GCLK3_Val"> Generic clock generator 3
+
+// <GCLK_PCHCTRL_GEN_GCLK4_Val"> Generic clock generator 4
+
+// <GCLK_PCHCTRL_GEN_GCLK5_Val"> Generic clock generator 5
+
+// <GCLK_PCHCTRL_GEN_GCLK6_Val"> Generic clock generator 6
+
+// <GCLK_PCHCTRL_GEN_GCLK7_Val"> Generic clock generator 7
+
+// <GCLK_PCHCTRL_GEN_GCLK8_Val"> Generic clock generator 8
+
+// <GCLK_PCHCTRL_GEN_GCLK9_Val"> Generic clock generator 9
+
+// <GCLK_PCHCTRL_GEN_GCLK10_Val"> Generic clock generator 10
+
+// <GCLK_PCHCTRL_GEN_GCLK11_Val"> Generic clock generator 11
+
+// <i> Select the slow clock source.
+#ifndef CONF_GCLK_SERCOM2_SLOW_SRC
+#define CONF_GCLK_SERCOM2_SLOW_SRC GCLK_PCHCTRL_GEN_GCLK3_Val
+#endif
+
+/**
+ * \def CONF_GCLK_SERCOM2_CORE_FREQUENCY
+ * \brief SERCOM2's Core Clock frequency
+ */
+#ifndef CONF_GCLK_SERCOM2_CORE_FREQUENCY
+#define CONF_GCLK_SERCOM2_CORE_FREQUENCY 100000000
+#endif
+
+/**
+ * \def CONF_GCLK_SERCOM2_SLOW_FREQUENCY
+ * \brief SERCOM2's Slow Clock frequency
+ */
+#ifndef CONF_GCLK_SERCOM2_SLOW_FREQUENCY
+#define CONF_GCLK_SERCOM2_SLOW_FREQUENCY 32768
+#endif
+
 // <y> USB Clock Source
 // <id> usb_gclk_selection