关于通用定时器的问题

#include <stdint.h>
#include <stdbool.h>
#include "inc/tm4c123gh6pm.h"
#include "inc/hw_memmap.h"
#include "inc/hw_types.h"
#include "driverlib/sysctl.h"
#include "driverlib/interrupt.h"
#include "driverlib/gpio.h"
#include "driverlib/timer.h"

void Timer0BIntHandler(void);

int main(void)
{
        SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN |
                       SYSCTL_XTAL_16MHZ);
        //不分频，使用振荡器，外部晶振16MHZ，MOSC作为振荡器源，系统时钟16MHZ
        SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);
        //使能GPIOF外设
        GPIOPinTypeGPIOOutput(GPIO_PORTA_BASE, GPIO_PIN_4);//PA4设置为输出
        GPIOPinWrite(GPIO_PORTA_BASE,GPIO_PIN_4,GPIO_PIN_4);//向PA4写1
        SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER0);
        //使能TIMER0
        //TimerConfigure(TIMER0_BASE, TIMER_CFG_ONE_SHOT);//单次计数模式
        TimerConfigure(TIMER0_BASE, TIMER_CFG_PERIODIC);//周期性计数模式
        TimerLoadSet(TIMER0_BASE, TIMER_A, 0x01E84800);//
        IntEnable(INT_TIMER0A);
        //使能TIMER0A
        TimerIntEnable(TIMER0_BASE, TIMER_TIMA_TIMEOUT);
        //TIMEOUT标志位触发中断
        IntMasterEnable();
        //master interrupt enable API for all interrupts
        TimerEnable(TIMER0_BASE, TIMER_A);
        TimerIntRegister(TIMER0_BASE,TIMER_A,Timer0BIntHandler);

        while(1)
        {
        }
}

void Timer0BIntHandler(void)
{ //清除定时器中断标志
    TimerIntClear(TIMER0_BASE, TIMER_TIMB_TIMEOUT);
    GPIOPinWrite(GPIO_PORTA_BASE,GPIO_PIN_4,
    (0x10^GPIOPinRead(GPIO_PORTA_BASE,GPIO_PIN_4)));
}