我卡在的这个地方 好像是32.768k晶振初始化的位置
CLKCONCMD = (CLKCONCMD_32MHZ | OSC_32KHZ); /* Select 32MHz XOSC and the source for 32K clock */ \
while (CLKCONSTA != (CLKCONCMD_32MHZ | OSC_32KHZ)); /* Wait for the change to be effective */ \
SLEEPCMD |= OSC_PD; /* turn off 16MHz RC */
大概是这个位置