6位数码管，从左到右，小时、分钟、秒，涉及到定时器0和动态数码管知识
#include<reg52.h> #define uchar unsigned char #define uint unsigned int uint n; uint sec, min, hour; sbit dula=P2^6; sbit wela=P2^7; uchar code table_dula[]={ 0x3f,0x06,0x5b,0x4f, 0x66,0x6d,0x7d,0x07, 0x7f,0x6f}; uint time[6]={0,0,0,0,0,0}; void reset()//初始化函数 { sec=0;//自定义时间 min=0; hour=0; TMOD=0x01; EA=1; ET0=1; TH0=(65536-50000)/256; TL0=(65536-50000)%256; TR0=1; } void delay(uint z) { uchar x,y; for(x=z;x>0;x--) for(y=50;y>0;y--); } void main() { reset(); while(1) { //h 十位 dula=1; P0=table_dula[time[0]]; dula=0; P0=0xff; wela=1; P0=0xfe; wela=0; delay(1); //h 个位 dula=1; P0=table_dula[time[1]]; dula=0; P0=0xff; wela=1; P0=0xfd; wela=0; delay(1); //min 十位 dula=1; P0=table_dula[time[2]]; dula=0; P0=0xff; wela=1; P0=0xfb; wela=0; delay(1); //min 个位 dula=1; P0=table_dula[time[3]]; dula=0; P0=0xff; wela=1; P0=0xf7; wela=0; delay(1); //sec 十位 dula=1; P0=table_dula[time[4]]; dula=0; P0=0xff; wela=1; P0=0xef; wela=0; delay(1); //sec 个位 dula=1; P0=table_dula[time[5]]; dula=0; P0=0xff; wela=1; P0=0xdf; wela=0; delay(1); } } void Time_0() interrupt 1 { n++; if(n==20) { n=0; sec++; if(sec==60) { sec=0; min++; if(min==60) { min=0; hour++; if(hour==24) { sec=0;min=0;hour=0; } } } } time[0]=hour/10; time[1]=hour%10; time[2]=min/10; time[3]=min%10; time[4]=sec/10; time[5]=sec%10; TH0=(65536-50000)/256; TL0=(65536-50000)%256; }