文件名称:baojingqi
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用P1.0输出1KHz和500Hz的音频信号驱动扬声器,作报警信号,要求1KHz信号响100ms,500Hz信号响200ms,交替进行,P1.7接一开关进行控制,当开关合上响报警信号,当开关断开告警信号停止,编出程序。-1KHz and 500Hz with the P1.0 output audio signals to drive speakers, as alarm signals to require 1KHz signal ring 100ms, 500Hz signal ring 200ms, alternately, P1.7 take control of a switch, when the switch is closed ring alarm signal, when switch off warning signals to stop, to compile the program.
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baojingqi.doc
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