调用总共四个计数器（两个六进制，两个十进制，六进制计数器可由实验五的程序做简单修改而成）串起来构成异步计数器，计数器的值，通过实验九串行扫描输出。用1Hz连续脉冲作为输入，这样就构成一个简单的1h计时器。带一个清零端。 输入：连续脉冲，逻辑开关；输出：七段LED。 -Called a total of four counters (two six-band, two decimal, hexadecimal counter by six experimental procedure

这是一个数字秒表的设计。几时周期为0.01s-1h。带有计数器的清零端，还有一个秒表的计时起止控制开关，最后计时信息显示在数码管上。-This is a digital stopwatch design. When a period of 0.01s-1h. Cleared with the end of the counter, and a stopwatch start and end time-control switch, the last time the information di

数字秒表设计：设计计时范围为0.01—1h的数字秒表，程序分为分频，计数和显示三个模块-Digital stopwatch design: the design timing range of 0.01-1h digital stopwatch program is divided into three divider, counting and display module