含从0开始计数，蜂鸣器定时鸣叫，LCD显示功能等正常-buzzer，cnt

本程序将指定的显示缓冲区送显，并将读取的键值送显。 入口参数：显示缓冲区首地址在SADR中,要显示的位数在CNT中。 出口参数: 无。-This procedure will be sent to the designated display buffer significantly, the key will be sent to a significant reading. Entrance parameters: the first address in the display b

定时中断。采用定时器T0，定时50ms，每次定时溢出引起中断，在中断程序中对计数器累加。每一秒LED亮0.2s，熄0.8s。 特色：低功耗。程序中技巧在于将1s分成cnt记20次，0.2秒占20 ，即中断的前4次都点亮，后16次都熄灭。-Interrupted from time to time. The use of timer T0, from time to time 50ms, each caused by overflow from time to time interrupted

MEGA128 计数 4位LED数码管显示-MEGA128 count 4 LED digital display

实现AD采集卡的AD DIO cnt DA功能-AD DIO