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关于MSP430F6638主存储区存储数据的问题

typedef struct
{
uint ID;
uchar gun_num;
uchar year;
uchar month;
uchar day;
uchar hour;
uchar minute;
uchar temperature;
uint lock_force[40];

}Flash_Data;

将以上结构体中的数据存入主存储区中,以上结构体的字节数为89个,为什么在存储区的占的字节数位90个?