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Nested_Exception_service_routine，如果不设置这个中断的话，程序跑飞
什么意思，什么叫不设置这个中断会跑飞？你使用的是stk例程把，这是异常嵌套函数入口，只有当在异常中断服务函数处理过程即调用Exception_service_routine时再次出现了异常，则会进入reset vector对应的Nested_Exception_service_routine。
