以stm32f103为例：

1.代码实现步骤简述：

        1.使能定时器时钟    RCC_APB1PeriphClockCmd();
        2.初始化定时器，配置per，psc   TIM_TimeBaseInit();
        3.开启定时器中断，配置NVIC
            void TIM_ITConfig();
            NVIC_Init();
        4.使能外设TIMx   TIM_Cmd();
        5.编写中断服务函数   TIMx_IRQHandler();

2.代码：

void TIM3_Init(uint32_t per,uint32_t psc)
{
	TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; //在stm32f10x_tim.h中
	NVIC_InitTypeDef NVIC_InitStructure;		
	
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
	//定时器中断初始化
	TIM_TimeBaseStructure.TIM_Period = per; //per计数
	TIM_TimeBaseStructure.TIM_Prescaler = psc; //分频
	TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; 
	TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //模式
	TIM_TimeBaseInit(TIM3, & TIM_TimeBaseStructure);
	
	TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE );//使能TIM_IT_Update中断,TIM_IT_Update为中断源
	TIM_Cmd(TIM3, ENABLE);//使能TIM3
	
	NVIC_InitStructure.NVIC_IRQChannel =TIM3_IRQn; 
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
	NVIC_Init(&NVIC_InitStructure);
	
}

void TIM3_IRQHandler(void)//中断服务函数
{
	if(TIM_GetITStatus(TIM3,TIM_IT_Update) == SET) 
	{
		GPIOC->ODR^=GPIO_Pin_13;//每隔500ms翻转GPIOC的13管脚
		TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
	}
	
}