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diff --git a/lib/samd21/samd21a/include/instance/pac2.h b/lib/samd21/samd21a/include/instance/pac2.h
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+/**
+ * \file
+ *
+ * \brief Instance description for PAC2
+ *
+ * Copyright (c) 2018 Microchip Technology Inc.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the Licence at
+ * 
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an AS IS BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _SAMD21_PAC2_INSTANCE_
+#define _SAMD21_PAC2_INSTANCE_
+
+/* ========== Register definition for PAC2 peripheral ========== */
+#if (defined(__ASSEMBLY__) || defined(__IAR_SYSTEMS_ASM__))
+#define REG_PAC2_WPCLR             (0x42000000) /**< \brief (PAC2) Write Protection Clear */
+#define REG_PAC2_WPSET             (0x42000004) /**< \brief (PAC2) Write Protection Set */
+#else
+#define REG_PAC2_WPCLR             (*(RwReg  *)0x42000000UL) /**< \brief (PAC2) Write Protection Clear */
+#define REG_PAC2_WPSET             (*(RwReg  *)0x42000004UL) /**< \brief (PAC2) Write Protection Set */
+#endif /* (defined(__ASSEMBLY__) || defined(__IAR_SYSTEMS_ASM__)) */
+
+/* ========== Instance parameters for PAC2 peripheral ========== */
+#define PAC2_WPROT_DEFAULT_VAL      0x00800000 // PAC protection mask at reset
+
+#endif /* _SAMD21_PAC2_INSTANCE_ */