STM32F030F4的TIM1定时10ms，时钟走的慢是怎么回事？

   STM32F030F4的tiM1定时10ms，时钟走的慢，用tim3运行正常
//FLK=ÄÚ²¿¾§Õñ8M
void TIMER_Initializes(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
  
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);

/* Time ¶¨Ê±Æ÷»ù´¡ÉèÖà */
TIM_TimeBaseStructure.TIM_Prescaler = 80-1; //Ô¤·ÖƵ
TIM_TimeBaseStructure.TIM_Period = 1000-1; //ÖØÔØÖµ
/*ÅäÖÃΪ10msÖжÏ*/
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM1,  TIM_TimeBaseStructure);

TIM_ClearFlag(TIM1, TIM_FLAG_Update);
TIM_ARRPreloadConfig(TIM1, ENABLE);

/* TIM ÖжÏʹÄÜ */
TIM_ITConfig(TIM1, TIM_IT_Update, ENABLE);
/* TIM1 ʹÄÜ */
TIM_Cmd(TIM1, ENABLE);
}
void TIM1_BRK_UP_TRG_COM_IRQHandler(void)

if (TIM_GetITStatus(TIM1, TIM_IT_Update) != RESET)
{
  TIM_ClearITPendingBit(TIM1, TIM_FLAG_Update);
  TaskRemarks();//GPIOA->ODR ^= GPIO_Pin_0;
}
}
void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
/* ÍâÉèÖÐ¶Ï */
/*  TIM1 ÖжÏǶÌ×Éè¼Æ*/
NVIC_InitStructure.NVIC_IRQChannel = TIM3TIM1_BRK_UP_TRG_COM_IRQnIRQn;  
NVIC_InitStructure.NVIC_IRQChannelPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init( NVIC_InitStructure);
}