/* The function is used to Enable or active power down function.  */
void SysCtlPowerDownEnable(xtBoolean bEnable)
/* The function is used to Enable or active power down function.  */
void SysCtlPowerDownEnable(xtBoolean bEnable)
{
    SysCtlKeyAddrUnlock();
    if(bEnable)
    {
        xHWREG(SYSCLK_PWRCON) |= SYSCLK_PWRCON_PWR_DO_EN;
    }
    else
    {
        xHWREG(SYSCLK_PWRCON) &= ~SYSCLK_PWRCON_PWR_DO_EN;
    }
    SysCtlKeyAddrLock();
}