/* System control can generate interrupts when the PLL achieves lock, if the internal LDO current limit is exceeded, if the internal oscillator fails, if the main oscillator fails, if the internal LDO output voltage droops too much, if the external voltage droops too much, or if the PLL fails. */
void SysCtlIntRegister(void(*pfnHandler)(void))
/* System control can generate interrupts when the PLL achieves lock, if the internal LDO current limit is exceeded, if the internal oscillator fails, if the main oscillator fails, if the internal LDO output voltage droops too much, if the external voltage droops too much, or if the PLL fails. */
void SysCtlIntRegister(void(*pfnHandler)(void))
{
    IntRegister(INT_SYSCTL_TM4C123, pfnHandler);
    IntEnable(INT_SYSCTL_TM4C123);
}