库函数TIM_UpdateRequestConfig用于设置寄存器，有两个参数：
对于这个库函数参数的定义，说明一塌糊涂。
函数的原型如下：
手册原型：
void TIM_UpdateRequestConfig(TIM_TypeDef* TIMx, uint16_t TIM_UpdateSource)
{
  /* Check the parameters */
  assert_param(IS_TIM_ALL_PERIPH(TIMx));
  assert_param(IS_TIM_UPDATE_SOURCE(TIM_UpdateSource));
  if (TIM_UpdateSource != TIM_UpdateSource_Global)
  {
    /* Set the URS Bit */
    TIMx->CR1 |= TIM_CR1_URS;
  }
  else
  {
    /* Reset the URS Bit */
    TIMx->CR1 &= (uint16_t)~((uint16_t)TIM_CR1_URS);
  }
}
库函数原型：
void TIM_UpdateRequestConfig(TIM_TypeDef* TIMx, uint16_t TIM_UpdateSource)
{
  /* Check the parameters */
  assert_param(IS_TIM_ALL_PERIPH(TIMx));
  assert_param(IS_TIM_UPDATE_SOURCE(TIM_UpdateSource));
  if (TIM_UpdateSource != TIM_UpdateSource_Global)
  {
    /* Set the URS Bit */
    TIMx->CR1 |= TIM_CR1_URS;
  }
  else
  {
    /* Reset the URS Bit */
    TIMx->CR1 &= (uint16_t)~((uint16_t)TIM_CR1_URS);
  }
}
各位看官，至于她什么地方一塌糊涂，自己研究。
我说一下，如何正确使用这个函数。
1.手册中的参数两个参数解释，反了（stm32f10x_stdperiph_lib_um.chm）：

   

• TIM_UpdateSource_Regular: Source of update is the counter overflow/underflow or the setting of UG bit, or an update generation through the slave mode controller.   
  
• TIM_UpdateSource_Global: Source of update is counter overflow/underflow
  

 
2.库函数定义处的说明同上一样反了。stm32f10x_time.c 第2109行。/**
  * @brief  Configures the TIMx Update Request Interrupt source.
  * @param  TIMx: where x can be 1 to 17 to select the TIM peripheral.
  * @param  TIM_UpdateSource: specifies the Update source.
  *   This parameter can be one of the following values:
  *     @arg TIM_UpdateSource_Regular: Source of update is the counter overflow/underflow
                                       or the setting of UG bit, or an update generation
                                       through the slave mode controller.
  *     @arg TIM_UpdateSource_Global: Source of update is counter overflow/underflow.
  * @retval None
  */3.参数宏定义的说明正确；stm32f10x_time.h 第0806行。#define TIM_UpdateSource_Global            ((uint16_t)0x0000) /*!< Source of update is the counter overflow/underflow
                                                                   or the setting of UG bit, or an update generation
                                                                   through the slave mode controller. */
#define TIM_UpdateSource_Regular           ((uint16_t)0x0001) /*!< Source of update is counter overflow/underflow. */ 

谢谢楼主提出的意见。

不错哦，楼主很细心！

楼主研究的很深啊

涨姿势，谢谢楼主！

楼主说的没错，库函数是解释错误了，在头文件中是正确的，但是行数应该是0860行【3.参数宏定义的说明正确；stm32f10x_time.h 第0806行。 】，我的库文件是3.5.0