diff --git a/arch/arm/src/sam3u/sam3u_rtc.h b/arch/arm/src/sam3u/sam3u_rtc.h
new file mode 100755
index 0000000000000000000000000000000000000000..479afb04548c72855aa87c26b6d079247d02a7f6
--- /dev/null
+++ b/arch/arm/src/sam3u/sam3u_rtc.h
@@ -0,0 +1,184 @@
+/****************************************************************************************
+ * arch/arm/src/sam3u/sam3u_rtc.h
+ *
+ *   Copyright (C) 2009 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************************/
+
+#ifndef __ARCH_ARM_SRC_SAM3U_SAM3U_RTC_H
+#define __ARCH_ARM_SRC_SAM3U_SAM3U_RTC_H
+
+/****************************************************************************************
+ * Included Files
+ ****************************************************************************************/
+
+#include <nuttx/config.h>
+
+#include "chip.h"
+#include "sam3u_memorymap.h"
+
+/****************************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************************/
+
+/* RTC register offsets *****************************************************************/
+
+#define SAM3U_RTC_CR_OFFSET            0x00 /* Control Register */
+#define SAM3U_RTC_MR_OFFSET            0x04 /* Mode Register */
+#define SAM3U_RTC_TIMR_OFFSET          0x08 /* Time Register */
+#define SAM3U_RTC_CALR_OFFSET          0x0c /* Calendar Register */
+#define SAM3U_RTC_TIMALR_OFFSET        0x10 /* Time Alarm Register */
+#define SAM3U_RTC_CALALR_OFFSET        0x14 /* Calendar Alarm Register */
+#define SAM3U_RTC_SR_OFFSET            0x18 /* Status Register */
+#define SAM3U_RTC_SCCR_OFFSET          0x1c /* Status Clear Command Register */
+#define SAM3U_RTC_IER_OFFSET           0x20 /* Interrupt Enable Register */
+#define SAM3U_RTC_IDR_OFFSET           0x24 /* Interrupt Disable Register */
+#define SAM3U_RTC_IMR_OFFSET           0x28 /* Interrupt Mask Register */
+#define SAM3U_RTC_VER_OFFSET           0x2c /* Valid Entry Register */
+
+/* RTC register adresses ****************************************************************/
+
+#define SAM3U_RTC_CR                   (SAM3U_RTC_BASE+SAM3U_RTC_CR_OFFSET)
+#define SAM3U_RTC_MR                   (SAM3U_RTC_BASE+SAM3U_RTC_MR_OFFSET)
+#define SAM3U_RTC_TIMR                 (SAM3U_RTC_BASE+SAM3U_RTC_TIMR_OFFSET)
+#define SAM3U_RTC_CALR                 (SAM3U_RTC_BASE+SAM3U_RTC_CALR_OFFSET)
+#define SAM3U_RTC_TIMALR               (SAM3U_RTC_BASE+SAM3U_RTC_TIMALR_OFFSET)
+#define SAM3U_RTC_CALALR               (SAM3U_RTC_BASE+SAM3U_RTC_CALALR_OFFSET)
+#define SAM3U_RTC_SR                   (SAM3U_RTC_BASE+SAM3U_RTC_SR_OFFSET)
+#define SAM3U_RTC_SCCR                 (SAM3U_RTC_BASE+SAM3U_RTC_SCCR_OFFSET)
+#define SAM3U_RTC_IER                  (SAM3U_RTC_BASE+SAM3U_RTC_IER_OFFSET)
+#define SAM3U_RTC_IDR                  (SAM3U_RTC_BASE+SAM3U_RTC_IDR_OFFSET)
+#define SAM3U_RTC_IMR                  (SAM3U_RTC_BASE+SAM3U_RTC_IMR_OFFSET)
+#define SAM3U_RTC_VER                  (SAM3U_RTC_BASE+SAM3U_RTC_VER_OFFSET)
+
+/* RTC register bit definitions *********************************************************/
+
+#define RTC_CR_UPDTIM                  (1 << 0)  /* Bit 0:  Update Request Time Register */
+#define RTC_CR_UPDCAL                  (1 << 1)  /* Bit 1:  Update Request Calendar Register */
+#define RTC_CR_TIMEVSEL_SHIFT          (8)       /* Bits 8-9:  Time Event Selection */
+#define RTC_CR_TIMEVSEL_MASK           (3 << RTC_CR_TIMEVSEL_SHIFT)
+#  define RTC_CR_TIMEVSEL_MIN          (0 << RTC_CR_TIMEVSEL_SHIFT)
+#  define RTC_CR_TIMEVSEL_HOUR         (1 << RTC_CR_TIMEVSEL_SHIFT)
+#  define RTC_CR_TIMEVSEL_MIDNIGHT     (2 << RTC_CR_TIMEVSEL_SHIFT)
+#  define RTC_CR_TIMEVSEL_NOON         (3 << RTC_CR_TIMEVSEL_SHIFT)
+#define RTC_CR_CALEVSEL_SHIFT          (16)      /* Bits 16-17:  Calendar Event Selection */
+#define RTC_CR_CALEVSEL_MASK           (3 << RTC_CR_CALEVSEL_SHIFT)
+#  define RTC_CR_CALEVSEL_WEEK         (0 << RTC_CR_CALEVSEL_SHIFT)
+#  define RTC_CR_CALEVSEL_MONTH        (1 << RTC_CR_CALEVSEL_SHIFT)
+#  define RTC_CR_CALEVSEL_YEAR         (2 << RTC_CR_CALEVSEL_SHIFT)
+
+#define RTC_MR_HRMOD                   (1 << 0)  /* Bit 0:  12-/24-hour Mode */
+
+#define RTC_TIMR_SEC_SHIFT             (0)       /* Bits 0-6:  Current Second */
+#define RTC_TIMR_SEC_MASK              (0x7f << RTC_TIMR_SEC_SHIFT)
+#define RTC_TIMR_MIN_SHIFT             (8)       /* Bits 8-14:  Current Minute */
+#define RTC_TIMR_MIN_MASK              (0x7f <<  RTC_TIMR_MIN_SHIFT)
+#define RTC_TIMR_HOUR_SHIFT            (16)      /* Bits 16-21: Current Hour */
+#define RTC_TIMR_HOUR_MASK             (0x3f << RTC_TIMR_HOUR_SHIFT)
+#define RTC_TIMR_AMPM                  (1 << 22) /* Bit 22: Ante Meridiem Post Meridiem Indicator */
+
+#define RTC_CALR_CENT_SHIFT            (0)       /* Bits 0-6:  Current Century */
+#define RTC_CALR_CENT_MASK             (0x7f << RTC_TIMR_HOUR_SHIFT)
+#define RTC_CALR_YEAR_SHIFT            (8)       /* Bits 8-15:  Current Year */
+#define RTC_CALR_YEAR_MASK             (0xff << RTC_CALR_YEAR_SHIFT)
+#define RTC_CALR_MONTH_SHIFT           (16)      /* Bits 16-20: Current Month */
+#define RTC_CALR_MONTH_MASK            (0x1f << RTC_CALR_MONTH_SHIFT)
+#define RTC_CALR_DAY_SHIFT             (21)      /* Bits 21-23: Current Day in Current Week */
+#define RTC_CALR_DAY_MASK              (7 << RTC_CALR_DAY_SHIFT)
+#define RTC_CALR_DATE_SHIFT            (24)      /* Bits 24-29: Current Day in Current Month */
+#define RTC_CALR_DATE_MASK             (0x3f << RTC_CALR_DATE_SHIFT)
+
+#define RTC_TIMALR_SEC_SHIFT           (0)       /* Bits 0-6:  Second Alarm */
+#define RTC_TIMALR_SEC_MASK            (0x7f << RTC_TIMALR_SEC_SHIFT)
+#define RTC_TIMALR_SECEN               (1 << 7)  /* Bit 7:  Second Alarm Enable */
+#define RTC_TIMALR_MIN_SHIFT           (8)       /* Bits 8-14:  Minute Alarm */
+#define RTC_TIMALR_MIN_MASK            (0x7f << RTC_TIMALR_MIN_SHIFT)
+#define RTC_TIMALR_MINEN               (1 << 15) /* Bit 15: Minute Alarm Enable */
+#define RTC_TIMALR_HOUR_SHIFT          (16)      /* Bits 16-21:  Hour Alarm */
+#define RTC_TIMALR_HOUR_MASK           (0x3f << RTC_TIMALR_HOUR_SHIFT)
+#define RTC_TIMALR_AMPM                (1 << 22) /* Bit 22: AM/PM Indicator */
+#define RTC_TIMALR_HOUREN              (1 << 23) /* Bit 23: Hour Alarm Enable */
+
+#define RTC_CALALR_MONTH_SHIFT         (16)      /* Bits 16-20:  Month Alarm */
+#define RTC_CALALR_MONTH_MASK          (0x1f << RTC_CALALR_MONTH_SHIFT)
+#define RTC_CALALR_MTHEN               (1 << 23) /* Bit 23: Month Alarm Enable */
+#define RTC_CALALR_DATE_SHIFT          (24)      /* Bits 24-29:  Date Alarm */
+#define RTC_CALALR_DATE_MASK           (0x3c << RTC_CALALR_DATE_SHIFT)
+#define RTC_CALALR_DATEEN              (1 << 31) /* Bit 31: Date Alarm Enable */
+
+#define RTC_SR_ACKUPD                  (1 << 0)  /* Bit 0:  Acknowledge for Update */
+#define RTC_SR_ALARM                   (1 << 1)  /* Bit 1:  Alarm Flag */
+#define RTC_SR_SEC                     (1 << 2)  /* Bit 2:  Second Event */
+#define RTC_SR_TIMEV                   (1 << 3)  /* Bit 3:  Time Event */
+#define RTC_SR_CALEV                   (1 << 4)  /* Bit 4:  Calendar Event */
+
+#define RTC_SCCR_ACKCLR                (1 << 0)  /* Bit 0:  Acknowledge Clear */
+#define RTC_SCCR_ALRCLR                (1 << 1)  /* Bit 1:  Alarm Clear */
+#define RTC_SCCR_SECCLR                (1 << 2)  /* Bit 2:  Second Clear */
+#define RTC_SCCR_TIMCLR                (1 << 3)  /* Bit 3:  Time Clear */
+#define RTC_SCCR_CALCLR                (1 << 4)  /* Bit 4:  Calendar Clear */
+
+#define RTC_IER_ACKEN                  (1 << 0)  /* Bit 0:  Acknowledge Update Interrupt Enable */
+#define RTC_IER_ALREN                  (1 << 1)  /* Bit 1:  Alarm Interrupt Enable */
+#define RTC_IER_SECEN                  (1 << 2)  /* Bit 2:  Second Event Interrupt Enable */
+#define RTC_IER_TIMEN                  (1 << 3)  /* Bit 3:  Time Event Interrupt Enable */
+#define RTC_IER_CALEN                  (1 << 4)  /* Bit 4:  Calendar Event Interrupt Enable */
+
+#define RTC_IDR_ACKDIS                 (1 << 0)  /* Bit 0:  Acknowledge Update Interrupt Disable */
+#define RTC_IDR_ALRDIS                 (1 << 1)  /* Bit 1:  Alarm Interrupt Disable */
+#define RTC_IDR_SECDIS                 (1 << 2)  /* Bit 2:  Second Event Interrupt Disable */
+#define RTC_IDR_TIMDIS                 (1 << 3)  /* Bit 3:  Time Event Interrupt Disable */
+#define RTC_IDR_CALDIS                 (1 << 4)  /* Bit 4:  Calendar Event Interrupt Disable */
+
+#define RTC_IMR_ACK                    (1 << 0)  /* Bit 0:  Acknowledge Update Interrupt Mask */
+#define RTC_IMR_ALR                    (1 << 1)  /* Bit 1:  Alarm Interrupt Mask */
+#define RTC_IMR_SEC                    (1 << 2)  /* Bit 2:  Second Event Interrupt Mask */
+#define RTC_IMR_TIM                    (1 << 3)  /* Bit 3:  Time Event Interrupt Mask */
+#define RTC_IMR_CAL                    (1 << 4)  /* Bit 4:  Calendar Event Interrupt Mask */
+
+#define RTC_VER_NVTIM                  (1 << 0)  /* Bit 0:  Non-valid Time */
+#define RTC_VER_NVCAL                  (1 << 1)  /* Bit 1:  Non-valid Calendar */
+#define RTC_VER_NVTIMALR               (1 << 2)  /* Bit 2:  Non-valid Time Alarm */
+#define RTC_VER_NVCALALR               (1 << 3)  /* Bit 3:  Non-valid Calendar Alarm */
+
+/****************************************************************************************
+ * Public Types
+ ****************************************************************************************/
+
+/****************************************************************************************
+ * Public Data
+ ****************************************************************************************/
+
+/****************************************************************************************
+ * Public Functions
+ ****************************************************************************************/
+
+#endif /* __ARCH_ARM_SRC_SAM3U_SAM3U_RTC_H */