#include "NUC100Series.h"
#define __HXT (24000000UL) /*!< High Speed External Crystal Clock Frequency */
/*
* @brief This function updates clock registers to fulfil the configuration
* @param None
* @return None
*/
void SYS_Init()
{
/* Unlock protected registers */
SYS_UnlockReg();
/* Enable clock source */
CLK_EnableXtalRC(CLK_PWRCON_OSC10K_EN_Msk|CLK_PWRCON_OSC22M_EN_Msk|CLK_PWRCON_XTL32K_EN_Msk|CLK_PWRCON_XTL12M_EN_Msk);
/* Waiting for clock source ready */
CLK_WaitClockReady(CLK_CLKSTATUS_OSC10K_STB_Msk|CLK_CLKSTATUS_OSC22M_STB_Msk|CLK_CLKSTATUS_XTL32K_STB_Msk|CLK_CLKSTATUS_XTL12M_STB_Msk);
/* Disable PLL first to avoid unstable when setting PLL */
CLK_DisablePLL();
/* Set PLL frequency */
CLK->PLLCON = (CLK->PLLCON & ~(0x000FFFFFul)) | 0x0000C00Eul;
/* Waiting for PLL ready */
CLK_WaitClockReady(CLK_CLKSTATUS_PLL_STB_Msk);
/* If the defines do not exist in your project, please refer to the related clk.h in the Header folder appended to the tool package. */
/* Set HCLK clock */
CLK_SetHCLK(CLK_CLKSEL0_HCLK_S_PLL, CLK_CLKDIV_HCLK(1));
/* Enable IP clock */
CLK_EnableModuleClock(ISP_MODULE);
CLK_EnableModuleClock(WDT_MODULE);
CLK_EnableModuleClock(WWDT_MODULE);
/* Set IP clock */
CLK_SetModuleClock(WDT_MODULE, CLK_CLKSEL1_WDT_S_LIRC, MODULE_NoMsk);
CLK_SetModuleClock(WWDT_MODULE, CLK_CLKSEL2_WWDT_S_HCLK_DIV2048, MODULE_NoMsk);
/* Update System Core Clock */
/* User can use SystemCoreClockUpdate() to calculate SystemCoreClock. */
SystemCoreClockUpdate();
/* Lock protected registers */
SYS_LockReg();
return;
}
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