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TM4C129ENCPDT Frequency Setup

bora kesim
Prodigy 20 points
Other Parts Discussed in Thread: TM4C129ENCPDT

Hi ,

I have tm4c129encpdt and 16 Mhz exteral cristal then i want to use it 80 Mhz but i cant. These are my frequency setups  

 freq = SysCtlClockFreqSet(SYSCTL_OSC_MAIN | SYSCTL_USE_PLL |SYSCTL_CFG_VCO_480| SYSCTL_XTAL_16MHZ, 80000000);

or 

SysCtlClockSet( SYSCTL_SYSDIV_2_5 | SYSCTL_USE_PLL |SYSCTL_OSC_MAIN | SYSCTL_XTAL_16MHZ);

Is there any trick? Thank you for interest.