CLK->ECKCR |= CLK_HSE_ON;
while (0x02 != (CLK->ECKCR&0x02))
continue;
CLK->SWCR = CLK_SWCR_SWEN; /* Enable clock switch execution.*/
CLK->SWR = CLK_SYSCLKSource_HSE; /* Select HSE as system clock source */
CLK->CKDIVR = CLK_SYSCLKDiv_1;
while (CLK_SYSCLKSource_HSE != (CLK->SCSR))
continue;
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