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TMS320F28069: 使用外部无源晶振时,芯片不工作,内部晶振就可以正常工作

Part Number: TMS320F28069
Other Parts Discussed in Thread: LAUNCHXL-F28069M, C2000WARE, TMDSCNCD28069ISO

您好,使用贵公司的TMS320F28069芯片时,使用20MHz(8倍频,2分频,最终CPU频率为90MHz  )的外部晶振则芯片不工作,换为使用内部晶振,则芯片可以正常工作,想问一下这是什么原因导致的,硬件电路图与软件配置有没有什么问题,请帮忙看下,谢谢!