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TMS320F280049: crystal 无法振盪

Part Number: TMS320F280049

F280049 我是使用内部1.2V电压,3.3V跟内部1.2V电压都正常,crystal 使用电容是12PF
XRSN 在通电后(无FW) 因为没有烧录FW的关係 , 会被watch dog 在一段时间后被拉LOW
但是crystal 就是无法振盪 , 请问我要如何检查