text: /*
  ** ###################################################################
  **     Processors:          MKL27Z128VFM4
  **                          MKL27Z128VFT4
  **                          MKL27Z128VLH4
  **                          MKL27Z128VMP4
  **                          MKL27Z256VFM4
  **                          MKL27Z256VFT4
  **                          MKL27Z256VLH4
  **                          MKL27Z256VMP4
  **
  **     Compilers:           Keil ARM C/C++ Compiler
  **                          Freescale C/C++ for Embedded ARM
  **                          GNU C Compiler
  **                          IAR ANSI C/C++ Compiler for ARM
  **                          MCUXpresso Compiler
  **
  **     Reference manual:    KL27P64M48SF6RM, Rev.3, Aug 2014
  **     Version:             rev. 1.8, 2016-06-24
  **     Build:               b170112
  **
  **     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 (c) 2016 Freescale Semiconductor, Inc.
  **     Copyright 2016 - 2017 NXP
  **     Redistribution and use in source and binary forms, with or without modification,
  **     are permitted provided that the following conditions are met:
  **
  **     o Redistributions of source code must retain the above copyright notice, this list
  **       of conditions and the following disclaimer.
  **
  **     o 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.
  **
  **     o Neither the name of the copyright holder 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 HOLDER 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.
  **
  **     http:                 www.nxp.com
  **     mail:                 support@nxp.com
  **
  **     Revisions:
  **     - rev. 1.0 (2014-03-27)
  **         Initial version.
  **     - rev. 1.1 (2014-05-26)
  **         I2S registers TCR2/RCR2 and others were changed.
  **         FLEXIO register FLEXIO_VERID has now bitfields: FEATURE, MINOR, MAJOR.
  **         Names of the bitfields of the FLEXIO_SHIFTBUF have been changed to the appropriate register name e.g.: FLEXIO_SHIFTBUFBBS_SHIFTBUFBBS.
  **         Peripheral_BASES macros has been changed to Peripheral_BASE_PTRS, e.g.: ADC_BASES to ADC_BASE_PTRS.
  **         Clock configuration for high range external oscillator has been added.
  **         RFSYS module access has been added.
  **     - rev. 1.2 (2014-07-10)
  **         GPIO - Renamed modules PTA,PTB,PTC,PTD,PTE to GPIOA,GPIOB,GPIOC,GPIOD,GPIOE.
  **         UART0 - UART0 module renamed to UART2.
  **         I2S - removed MDR register.
  **     - rev. 1.3 (2014-08-21)
  **         UART2 - Removed ED register.
  **         UART2 - Removed MODEM register.
  **         UART2 - Removed IR register.
  **         UART2 - Removed PFIFO register.
  **         UART2 - Removed CFIFO register.
  **         UART2 - Removed SFIFO register.
  **         UART2 - Removed TWFIFO register.
  **         UART2 - Removed TCFIFO register.
  **         UART2 - Removed RWFIFO register.
  **         UART2 - Removed RCFIFO register.
  **         USB - Removed bitfield REG_EN in CLK_RECOVER_IRC_EN register.
  **         SIM - Changed bitfield value MCGIRCLK to LIRC_CLK of bitfield CLKOUTSEL in SOPT2 register.
  **         SIM - Removed bitfield DIEID in SDID register.
  **     - rev. 1.4 (2014-09-01)
  **         USB - USB0_CTL0 was renamed to USB0_OTGCTL register.
  **         USB - USB0_CTL1 was renamed to USB0_CTL register.
  **     - rev. 1.5 (2014-09-05)
  **         USB - Renamed USBEN bitfield of USB0_CTL was renamed to USBENSOFEN.
  **     - rev. 1.6 (2015-07-29)
  **         Correction of backward compatibility.
  **     - rev. 1.7 (2016-02-02)
  **         FGPIO - Add FGPIO registers.
  **     - rev. 1.8 (2016-06-24)
  **         USB - OTGCTL register was removed.
  **         USB - Bit RESUME was added in CTL register.
  **
  ** ###################################################################
  */
  
  /*!
   * @file MKL27Z4
   * @version 1.8
   * @date 2016-06-24
   * @brief Device specific configuration file for MKL27Z4 (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_MKL27Z4_H_
  #define _SYSTEM_MKL27Z4_H_                       /**< Symbol preventing repeated inclusion */
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  #include <stdint.h>
  
  
  #ifndef DISABLE_WDOG
    #define DISABLE_WDOG  1
  #endif
  
  #define ACK_ISOLATION   1
  
  /* Define clock source values */
  
  #define CPU_XTAL_CLK_HZ                32768u              /* Value of the external crystal or oscillator clock frequency in Hz */
  #define CPU_INT_FAST_CLK_HZ            48000000u           /* Value of the fast internal oscillator clock frequency in Hz  */
  #define CPU_INT_IRC_CLK_HZ             48000000u           /* Value of the 48M internal oscillator clock frequency in Hz  */
  
  /* Low power mode enable */
  /* SMC_PMPROT: AVLP=1,AVLLS=1 */
  #define SYSTEM_SMC_PMPROT_VALUE        0x2Au               /* SMC_PMPROT */
  
  #define DEFAULT_SYSTEM_CLOCK           8000000u            /* Default System clock value */
  #define CPU_INT_SLOW_CLK_HZ            8000000u            /* Value of the slow internal oscillator clock frequency in Hz  */
  
  
  /**
   * @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  /* _SYSTEM_MKL27Z4_H_ */
  