【单选题】【消耗次数：1】
MCS-51响应中断时，下面哪一个条件不是必须的（）。
①
当前指令执行完毕
②
中断是开放的
③
没有同级或高级中断服务
④
必须有RETI指令
参考答案：
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【简答题】
简述MCS-51的中断响应过程
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