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cc2640r2f无法识别芯片

Other Parts Discussed in Thread: CC2640R2F

我自己画的板子,原理图如下,使用flashprogrammer烧录,无法识别芯片,调试使用xds100v3 TCK和TMS两脚烧录。VDDS和DCDCSW等电压都是正常的。请问有可能什么原因。