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diff --git a/libmaple/stm32f1/include/series/pwr.h b/libmaple/stm32f1/include/series/pwr.h
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+++ b/libmaple/stm32f1/include/series/pwr.h
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+/******************************************************************************
+ * The MIT License
+ *
+ * Copyright (c) 2012 LeafLabs, LLC.
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy,
+ * modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *****************************************************************************/
+
+/**
+ * @file stm32f1/pwr.h
+ * @author Marti Bolivar <mbolivar@leaflabs.com>
+ * @brief STM32F1 Power control (PWR) support.
+ */
+
+#ifndef _LIBMAPLE_STM32F1_PWR_H_
+#define _LIBMAPLE_STM32F1_PWR_H_
+
+/*
+ * Register bit definitions
+ */
+
+/* Control register */
+
+/* PVD level selection */
+#define PWR_CR_PLS_2_2V (0x0 << 5)
+#define PWR_CR_PLS_2_3V (0x1 << 5)
+#define PWR_CR_PLS_2_4V (0x2 << 5)
+#define PWR_CR_PLS_2_5V (0x3 << 5)
+#define PWR_CR_PLS_2_6V (0x4 << 5)
+#define PWR_CR_PLS_2_7V (0x5 << 5)
+#define PWR_CR_PLS_2_8V (0x6 << 5)
+#define PWR_CR_PLS_2_9V (0x7 << 5)
+
+#endif