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+/*
+** ###################################################################
+** Compilers: ARM Compiler
+** Freescale C/C++ for Embedded ARM
+** GNU C Compiler
+** IAR ANSI C/C++ Compiler for ARM
+**
+** Reference manuals: K20P64M50SF0RM Rev. 1, Oct 2011
+** K20P32M50SF0RM Rev. 1, Oct 2011
+** K20P48M50SF0RM Rev. 1, Oct 2011
+**
+** Version: rev. 2.0, 2012-03-19
+**
+** Abstract:
+** Provides a system configuration function and a global variable that
+** contains the system frequency. It configures the device and initializes
+** the oscillator (PLL) that is part of the microcontroller device.
+**
+** Copyright: 2015 Freescale Semiconductor, Inc. All Rights Reserved.
+**
+** http: www.freescale.com
+** mail: support@freescale.com
+**
+** Revisions:
+** - rev. 1.0 (2011-12-15)
+** Initial version
+** - rev. 2.0 (2012-03-19)
+** PDB Peripheral register structure updated.
+** DMA Registers and bits for unsupported DMA channels removed.
+**
+** ###################################################################
+*/
+
+/**
+ * @file MK20D5
+ * @version 2.0
+ * @date 2012-03-19
+ * @brief Device specific configuration file for MK20D5 (header file)
+ *
+ * Provides a system configuration function and a global variable that contains
+ * the system frequency. It configures the device and initializes the oscillator
+ * (PLL) that is part of the microcontroller device.
+ */
+
+#ifndef SYSTEM_MK20D5_H_
+#define SYSTEM_MK20D5_H_ /**< Symbol preventing repeated inclusion */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+
+/**
+ * @brief System clock frequency (core clock)
+ *
+ * The system clock frequency supplied to the SysTick timer and the processor
+ * core clock. This variable can be used by the user application to setup the
+ * SysTick timer or configure other parameters. It may also be used by debugger to
+ * query the frequency of the debug timer or configure the trace clock speed
+ * SystemCoreClock is initialized with a correct predefined value.
+ */
+extern uint32_t SystemCoreClock;
+
+/**
+ * @brief Setup the microcontroller system.
+ *
+ * Typically this function configures the oscillator (PLL) that is part of the
+ * microcontroller device. For systems with variable clock speed it also updates
+ * the variable SystemCoreClock. SystemInit is called from startup_device file.
+ */
+void SystemInit (void);
+
+/**
+ * @brief Updates the SystemCoreClock variable.
+ *
+ * It must be called whenever the core clock is changed during program
+ * execution. SystemCoreClockUpdate() evaluates the clock register settings and calculates
+ * the current core clock.
+ */
+void SystemCoreClockUpdate (void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* #if !defined(SYSTEM_MK20D5_H_) */