其实我想问一下，我建c8t6的工程，选用md的启动文件，为什么我定时器定时5ms，实际却是50ms，我延时500ms让LED闪烁，却发现是5s。这是为什么？不知道为什么，求解！代码如下
                LED0=0;
                delay_ms(500);
                LED0=1;
                delay_ms(500);

void Timer1_Init(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
        NVIC_InitTypeDef NVIC_InitStructure;
        TIM_DeInit(TIM1);
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
TIM_TimeBaseStructure.TIM_Period = 49;//×Ô¶ˉÖØ×°3õÖμ￡¬Ã¿200′ÎÖD¶Ïò»′Π 5MS
TIM_TimeBaseStructure.TIM_Prescaler = 7199;//pscÔ¤·ÖÆμ
TIM_TimeBaseStructure.TIM_ClockDivision = 0;//ê±Öó2»·ÖÆμ
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;//ÏòéϼÆêyÄ￡ê½
TIM_TimeBaseInit(TIM1, & TIM_TimeBaseStructure);
       
TIM_ARRPreloadConfig(TIM1,ENABLE);//ê1ÄüTIMxÔúARRéÏμÄԤװÔؼÄ′æÆ÷
TIM_Cmd(TIM1,ENABLE);//ê1Äü¶¨ê±Æ÷
TIM_ITConfig(TIM1,TIM_IT_Update,ENABLE);        //ê1Äü¶¨ê±Æ÷ÖD¶Ï
       
  NVIC_InitStructure.NVIC_IRQChannel = TIM1_UP_IRQn;//éèÖÃí¨μàêy
        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;//Ö÷óÅÏ輶
        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;//′óóÅÏ輶
        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
        NVIC_Init(&NVIC_InitStructure);       
}