关于K20D72系统时钟配置的问题

caizhongshan

以下为K20D72的system_MK20D7.c文件，在keil底下的范例，请问这里面的系统默认时钟是否可以进行配置？SystemCoreClockUpdate (void)里面是空文件，该怎么弄，谢谢~~
 
#include
#include "MK20D7.h"
  #define DEFAULT_SYSTEM_CLOCK            20971520u /* Default System clock value */
  #define DISABLE_WDOG                            1
/* ----------------------------------------------------------------------------
   -- Core clock
   ---------------------------------------------------------------------------- */
uint32_t SystemCoreClock = DEFAULT_SYSTEM_CLOCK;
/* ----------------------------------------------------------------------------
   -- SystemInit()
   ---------------------------------------------------------------------------- */
void SystemInit (void) {
#if (DISABLE_WDOG)  // 15.02.2012 Added by ARM
  /* Disable the WDOG module */
  /* WDOG_UNLOCK: WDOGUNLOCK=0xC520 */
  WDOG->UNLOCK = (uint16_t)0xC520u;     /* Key 1 */
  /* WDOG_UNLOCK : WDOGUNLOCK=0xD928 */
  WDOG->UNLOCK  = (uint16_t)0xD928u;    /* Key 2 */
  /* WDOG_STCTRLH: ??=0,DISTESTWDOG=0,BYTESEL=0,TESTSEL=0,TESTWDOG=0,??=0,STNDBYEN=1,WAITEN=1,STOPEN=1,DBGEN=0,ALLOWUPDATE=1,WINEN=0,IRQRSTEN=0,CLKSRC=1,WDOGEN=0 */
  WDOG->STCTRLH = (uint16_t)0x01D2u;
#endif /* (DISABLE_WDOG) */
}
/* ----------------------------------------------------------------------------
   -- SystemCoreClockUpdate()
   ---------------------------------------------------------------------------- */
void SystemCoreClockUpdate (void) {
}
 

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