USART_TypeDef结构体中的RESERVED是干什么用的？
/**
* @brief Universal Synchronous Asynchronous Receiver Transmitter
*/
typedef struct
{
__IO uint16_t SR;
uint16_t RESERVED0;
__IO uint16_t DR;
uint16_t RESERVED1;
__IO uint16_t BRR;
uint16_t RESERVED2;
__IO uint16_t CR1;
uint16_t RESERVED3;
__IO uint16_t CR2;
uint16_t RESERVED4;
__IO uint16_t CR3;
uint16_t RESERVED5;
__IO uint16_t GTPR;
uint16_t RESERVED6;
} USART_TypeDef;
/** |
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