51单片机按住键盘,数码管会变亮,松开时变成正常显示亮度答:if(k1==0) { delay(5);setdisplay(hour,minute,second,year,month,date);if(k1==0) { flag=1;num++;while(!k1) setdisplay(hour,minute,second,year,month,date);switch(num) { case 1: flag=1; break;//year case 2: flag=1; break;//month case 3: flag=1; break;//day ...
51单片机 秒表设计 怎么用按键控制开始 停止和清零?答:include<reg52.h> sbit AA=P3^4;//数码管显示用IO端口 sbit BB=P3^5;sbit CC=P3^6;sbit DD=P3^7;sbit X=P2^7;//启动按钮 sbit Y=P2^6;//停止按钮 sbit Z=P2^5;//清零按钮 int aa,temp;char table[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};//...