使用keil软件。单片机电子时钟用AT89C51单片机的定时/计数器T0产生一秒的定时时间，作为秒计数时间，当一秒产生时，秒计数加1。开机时显示00-00-00的时间，开始计时：P1.0控制“add（加）“的调整，每按一次计数加1；P1.1控制“minute（减）“的调整，每按一次计数减1；P1.2控制”移位“的调整，第一次按键按下是控制秒或天加1，第二次按键按下是控制分或月加1，第三次按键按下是控制时或年加1。计时满23-59-59时，返回00-00-00重新计时。P1.4用做复位键，在计时过程中如果按下复位键，则返回00-00-00重新计时。P1.3用作切换键，按下切换键切换到显示年月日。-Use keil software. SCM AT89C51 microcontroller with electronic clock timer/counter T0 produce a second timing, as the seconds counting time, when a second generation, plus a second count. 00-00-00 show time starts counting at boot: P1.0 Control　add (plus)　adjustment count is incremented each time you press 1　P1.1 control　minute (minus)　adjusted each time count by 1　P1.2 control　Shift　adjustment, the first key press is controlled seconds or days plus a second button press control points or month plus a third button is pressed control or years plus 1. When the timing is full 23-59-59, 00-00-00 re-timing return. P1.4 used the reset button, the timer process if the reset button is pressed, it returns 00-00-00 re-timing. P1.3 used as a toggle key, press the switch button to switch to display the date.