说明：  （1）正常计时：秒（60）、分（60）、小时（24）计数；秒计时的频率为1Hz，数码管用动态扫描实时显示计时的小时、分、秒。 （２）整点报时：逢整点蜂鸣器在“59”分钟的第51、53、55、57秒发频率为500Hz的低音，在“59”分钟的第59秒发频率为1000Hz的高音。 （３）校时： 校小时, 显示小时数码管以4Hz的频率递增计数； 校分, 显示分数码管以4Hz的频率递增计数； 校秒, 秒清0。
((1) normal time: second (60), sub (60), hour (24) count; the frequency of second time is 1Hz, the digital tube dynamic scan real-time display time, minute, second. (2) whole point: a buzzer with a frequency of 500Hz in fifty-first, fifty-third, fifty-fifth and 57 seconds of the "59" minute, and the frequency of 1000Hz in the fifty-ninth seconds of "59" minutes. (3) school: The hour is displayed, and the number of the hour digital tube is increased with the frequency of 4Hz. The score is displayed, and the digit tube is increased by counting the frequency of 4Hz. School seconds, second clear 0.)