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程序如下：
while(BAKCTL & LOCKIO) // 解锁XT1引脚
BAKCTL &= ~(LOCKIO);
是实现BAKCTL中LOCKBAK位置零，使得Backup subsystem not locked，这和解锁XTI引脚有何关系？
这个资料讲的比较清楚：http://www.ti.com.cn/cn/lit/sw/slau316/slau316.pdf
看5.3部分
非常感谢！
