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why F2808 sysclk changed?

I use XDS100V3 to debug f2808,when I debug F2808 using jtag,the sysclk and xclkout is 100MHz,but when I plug off the usb port of XDS100V3,the xclkout and sysclk change to 200MHz,.I can see the sci tx waveform changed from 100KHz to 200KHz..this also happened when I reboot the F2808 without XDS100V3.Why this happened,is there anybody help me to fix it?