/* This function will disable the USB controller's PLL which is used by it's physical layer. The USB registers are still accessible, but the physical layer will no longer function. */
void SysCtlUSBPLLDisable(void)
/* This function will disable the USB controller's PLL which is used by it's physical layer. The USB registers are still accessible, but the physical layer will no longer function. */
void SysCtlUSBPLLDisable(void)
{
    HWREG(SYSCTL_RCC2) |= SYSCTL_RCC2_USBPWRDN;
}