diff --git a/arch/arm/src/lpc313x/lpc313x_pwm.h b/arch/arm/src/lpc313x/lpc313x_pwm.h
new file mode 100755
index 00000000000..94552d7c10d
--- /dev/null
+++ b/arch/arm/src/lpc313x/lpc313x_pwm.h
@@ -0,0 +1,97 @@
+/************************************************************************************************
+ * arch/arm/src/lpc313x/lpc313x_pwm.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_LPC313X_PWM_H
+#define __ARCH_ARM_SRC_LPC313X_PWM_H
+
+/************************************************************************************************
+ * Included Files
+ ************************************************************************************************/
+
+#include <nuttx/config.h>
+#include "lpc313x_memorymap.h"
+
+/************************************************************************************************
+ * Pre-processor Definitions
+ ************************************************************************************************/
+
+/* PWM register base address offset into the APB1 domain ****************************************/
+
+#define LPC313X_PWM_VBASE                (LPC313X_APB1_VSECTION+LPC313X_APB1_PWM_OFFSET)
+#define LPC313X_PWM_PBASE                (LPC313X_APB1_PSECTION+LPC313X_APB1_PWM_OFFSET)
+
+/* PWM register offsets (with respect to the PWM base) ******************************************/
+
+#define LPC313X_PWM_TMR_OFFSET           0x000 /* Timer Register */
+#define LPC313X_PWM_CNTL_OFFSET          0x004 /* Control Register */
+
+/* PWM register (virtual) addresses *************************************************************/
+
+#define LPC313X_PWM_TMR                 (LPC313X_PWM_VBASE+LPC313X_PWM_TMR_OFFSET)
+#define LPC313X_PWM_CNTL                (LPC313X_PWM_VBASE+LPC313X_PWM_CNTL_OFFSET)
+
+/* PWM register bit definitions *****************************************************************/
+
+/* Timer register TMR, address 0x13009000 */
+
+#define PWM_TMR_SHIFT                   (0)    /* Bits 0-11: Timer used for PWM and PDM */
+#define PWM_TMR_MASK                    (0xfff < PWM_TMR_SHIFT)
+
+/* Control register CNTL, address 0x13009004 */
+
+#define PWM_CNTL_PDM                    (1 << 7)  /* Bit 7:  PDM Select PDM mode */
+#define PWM_CNTL_LOOP                   (1 << 6)  /* Bit 6:  Output inverted with top 4 TMR bits */
+#define PWM_CNTL_HI                     (1 << 4)  /* Bit 4:  PWM output forced high */
+                                                  /* Bits 2-3: Reserved */
+#define PWM_CNTL_CLK_SHIFT              (0)       /* Bits 0-1: Configure PWM_CLK for output pulses */
+#define PWM_CNTL_CLK_MASK               (3 << PWM_CNTL_CLK_SHIFT)
+#  define PWM_CNTL_CLKDIV1              (0 << PWM_CNTL_CLK_SHIFT) /* PWM_CLK */
+#  define PWM_CNTL_CLKDIV2              (1 << PWM_CNTL_CLK_SHIFT) /* PWM_CLK/2 */
+#  define PWM_CNTL_CLKDIV4              (2 << PWM_CNTL_CLK_SHIFT) /* PWM_CLK/4 */
+#  define PWM_CNTL_CLKDIV8              (3 << PWM_CNTL_CLK_SHIFT) /* PWM_CLK/8 */
+
+/************************************************************************************************
+ * Public Types
+ ************************************************************************************************/
+
+/************************************************************************************************
+ * Public Data
+ ************************************************************************************************/
+
+/************************************************************************************************
+ * Public Functions
+ ************************************************************************************************/
+
+#endif /* __ARCH_ARM_SRC_LPC313X_PWM_H */