程序可以完成以下功能：

（1）本程序以stc12c5410ad为控制器而设计

（2）本程序可以完成计数功能，最大值为9999。

（3）计数接口采用stc12c5410ad的第13个引脚，即P2.5。

（4）P2.5平时为高电平，当P2.5变为低电平，且低电平时间超过907us时，则计数器加1。

（5）本程序具有计时功能，当单片机上电复位之后开始计时，时间以秒的形式显示出来。

计时最大值为9999s。

（6）四个数码管显示计数值，当按下KEY3键时，显示时间，即单片机已经运行了多少秒。

当松开KEY3按键时，数码管仍然显示计数值。

（7）计数值没有存储，当单片机上电复位时，计数值归零。

-The program can perform the following functions: (1) this program STC12C5410AD-controller design (2) procedures to be completed counting function, the maximum is 9999. (3) Count interface using 13-pin STC12C5410AD, P2.5. (4) P2.5 usually high, when P2.5 goes low, low time exceeds 907us, the counter is incremented by 1. (5) The program has a timer function, single-chip power-on reset start time, time displayed and seconds. The timing a maximum of 9999s. (6) four digital display count value, When the press KEY3, display time, the microcontroller has been running for a number of seconds. When release the KEY3 button, the digital still count. (7) the count value is not stored, when the single-chip power-on reset, the count value to zero.