【单选题】【消耗次数：1】
中断发生时，由硬件更新程序计数器PC，而不是由软件完成，主要是为了____
①
能进入中断处理程序并正确返回源程序
②
节省内存
③
提高处理机的速度
④
使中断处理程序易于编址，不易出错
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