请查看 stm32f10x_flash.c 文件 ， 就知道怎么回事了
/**
* @brief Unlocks the FLASH Program Erase Controller.
* @NOTE This function can be used for all STM32F10x devices.
* - For STM32F10X_XL devices this function unlocks Bank1 and Bank2.
* - For all other devices it unlocks Bank1 and it is equivalent
* to FLASH_UnlockBank1 function..
* @param None
* @retval None
*/
void FLASH_Unlock(void)
{
/* Authorize the FPEC of Bank1 Access */
FLASH->KEYR = FLASH_KEY1;
FLASH->KEYR = FLASH_KEY2;
#ifdef STM32F10X_XL
/* Authorize the FPEC of Bank2 Access */
FLASH->KEYR2 = FLASH_KEY1;
FLASH->KEYR2 = FLASH_KEY2;
#endif /* STM32F10X_XL */
}
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