设计一个数码显示的秒表，具有以下功能：

（1）显示时间0~99秒，每秒自动加1

（2）具有时间手动暂停和复位显示功能。按“开始”按键，开始计数，数码管显示从00开始每秒自动加一；按“复位”按键，系统清零，数码管显示00；按“暂停”按键，系统暂停计数，数码管显示当时的计数

-Design a digital display of the stopwatch, has the following functions: (1) shows 0 to 99 seconds, plus 1 per auto (2) have to manually pause and reset the time display. Click " Start"　button to begin counting, digital display automatically from 00 starts plus one per second　press the " reset"　button, the system clear, digital display 00　press the " pause"　button, the system is suspended from counting, digital display was count