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diff --git a/libmaple/pwr.h b/libmaple/pwr.h
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+/******************************************************************************
+ * The MIT License
+ *
+ * Copyright (c) 2010 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 pwr.h
+ * @brief Power control (PWR) defines.
+ */
+
+#define PWR_BASE 0x40007000
+
+#define PWR_CR      (PWR_BASE + 0x0)
+#define PWR_CR_DBP  8 /* Disable backup domain write protection bit */
+#define PWR_CR_PVDE 4 /* Power voltage detector enable bit */
+#define PWR_CR_CSBF 3 /* Clear standby flag bit */
+#define PWR_CR_CWUF 2 /* Clear wakeup flag bit */
+#define PWR_CR_PDDS 1 /* Power down deepsleep bit */
+#define PWR_CR_LPDS 0 /* Low-power deepsleep bit */
+
+#define PWR_CSR      (PWR_BASE + 0x4)
+#define PWR_CSR_EWUP 8          /* Enable wakeup pin bit */
+#define PWR_CSR_PVDO 2          /* PVD output bit */
+#define PWR_CSR_SBF  1          /* Standby flag bit */
+#define PWR_CSR_WUF  0          /* Wakeup flag bit */