void Clk_Init()
{
ICS_C1|=ICS_C1_IRCLKEN_MASK; /* Enable the internal reference clock*/
ICS_C3= 0x90; /* Reference clock frequency = 39.0625 KHz*/
while(!(ICS_S & ICS_S_LOCK_MASK)); /* Wait for PLL lock, now running at 40 MHz (1024 * 39.0625Khz) */
ICS_C2|=ICS_C2_BDIV(1) ; /*BDIV=2, Bus clock = 20 MHz*/
ICS_S |= ICS_S_LOCK_MASK ; /* Clear Loss of lock sticky bit */
}为什么设置ICS_C3= 0x90就对应39.0625 KHz，用户手册上也没说SCTRIM是如何调整的 |
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