利用8253实现闪烁灯效果，并最终通过键盘输入指定时间实现定时闪烁，同时利用七段数码管倒计时辅助显示闪烁时间，实现定时设定功能。比如：按下键盘9号键，则LED灯开始每秒闪烁一下，9秒后停止闪烁，实现定时闪烁；同时数码管从9开始倒计时显示辅助显示闪烁时间。-The use of 8253 to achieve a blinking light effect, and ultimately to achieve a specified time by the regular keyboard input flash, while supporting the use of seven-segment LED countdown display flashes the time to achieve timing setting function. For example: press the keyboard 9 key, the LED flash once per second start, 9 seconds after the flashing, blinking regularly achieved　9 start from the same digital countdown display auxiliary display flashes the time.