Description: 1, by way of CPU time the internal timer query and achieve the status of each occurrence of a second output inversion.
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File list (Check if you may need any files):
5-定时控频蜂鸣器
................\5-定时控频蜂鸣器
................\................\定时控频蜂鸣器ASM
................\................\.................\MAIN.ASM
................\................\.................\MAIN.BIN
................\................\.................\MAIN.HEX
................\................\.................\Untitled
................\................\.................\UNTITLED.DSK
................\................\.................\定时控频蜂鸣器ASM.BIN
................\................\.................\定时控频蜂鸣器ASM.DSK
................\................\.................\定时控频蜂鸣器ASM.HEX
................\................\.................\定时控频蜂鸣器ASM.PRJ
................\................\定时控频蜂鸣器C
................\................\...............\MAIN.C
................\................\...............\MAIN.LST
................\................\...............\MAIN.OBJ
................\................\...............\REG51.H
................\................\...............\TEMP.LST
................\................\...............\Untitled
................\................\...............\WAVE.LIN
................\................\...............\定时控频蜂鸣器C
................\................\...............\定时控频蜂鸣器C.BIN
................\................\...............\定时控频蜂鸣器C.DSK
................\................\...............\定时控频蜂鸣器C.HEX
................\................\...............\定时控频蜂鸣器C.M51
................\................\...............\定时控频蜂鸣器C.PRJ
................\定时控频蜂鸣器.doc