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TM4C129DNCZAD: usb-cdc 通讯

Part Number: TM4C129DNCZAD

我之前用TM4C1233G6PGE的程序移植到TM4C129DNCZAD,就是将时钟从80M 改成120M 。TM4C129DNCZAD程序总是提示 设备无法设备,是USB - CDC 虚拟串口程序,TM4C129DNCZAD需要设置USB 时钟吗?TM4C1233G6PGE程序是没有指定的。