服务请求会访问时间日期时钟,–个增量指令会添加在修正值中,并且另外的一一个服务请求t会在将新的数值写入时间日期时钟当中,这种方法的一个缺点是如果更换一-个CPU,将不得不测出-一个新的修正系数,同时环境温度的变化对这种方法的修正也是有影响的,因此这种方法的成功要求CPU放置于-一个稳定的周围环境之中.
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