《基于51单片机的4位数码管电子钟》由会员分享，可在线阅读，更多相关《基于51单片机的4位数码管电子钟（5页珍藏版）》请在金锄头文库上搜索。
1、附：源程序/*标题：定时器中断 24小时时钟程序效果：数码管显示24小时制时钟(具有调时功能)说明：使用12M晶振,key1=P37; key2=P36; key3=P35; key4=P34;数码管位选P1.0P1.3，段选P0*/#include#define uchar unsigned char;#define uint unsigned int;uchar position; uchar tt; uchar second; uchar minute;uchar hour; uchar code table=0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8
2、,0x80,0x90;/0-9sbit smg_q = P10; /数码管千位引脚sbit smg_b = P11;sbit smg_s = P12;sbit smg_g = P13;sbit key1=P37; /按键定义sbit key2=P36;sbit key3=P35;sbit key4=P34;void keyscan(); /函数声明void display(unsigned char hour,unsigned char minute);void delay(unsigned int timer); void init();/*主函数*/void main()init();wh
3、ile(1)if(tt=20)tt=0;second+;if(second=60)second=0;minute+;if(minute=60)minute=0;hour+;if(hour=24)hour=0;keyscan();display(hour,minute);delay(1);/*调时*/void keyscan()if(key1=0) /小时加1TR0=0;hour+;if(hour=24)hour=0;delay(200);TR0=1;if(key2=0)/ 小时减TR0=0;hour-;if(hour0)hour=23;delay(200);TR0=1;if(key3=0) /
4、分钟加TR0=0;minute+;if(minute=60)minute=0;delay(200);TR0=1;if(key4=0) /分钟减TR0=0;minute-;if(minute=10)P0&=0x7f;/小数点以半秒的时间闪烁break;case 2:smg_b=1;smg_s=0;P0=tableminute/10;break;case 3:smg_s=1;smg_g=0;P0=tableminute%10;break;position+;if(position3)position=0;/* 延时*/void delay(unsigned int time)unsigned int x,y;for(x=time;x0;x-)for(y=110;y0;y-);
