基于C51的4位数码管动态显示程序

#include "reg51.h" #define uchar unsigned char #define uint unsigned int #define setbit(var, bitt) ( var |= (0x01<<bitt) ) #define clrbit(var, bitt) ( var &= (~(0x01<<bitt)) ) #define checkbit(var,bitt) (var & (0x01 << bitt)) uchar table[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90}; /*七段数码编码数据 1 2 3 4 */ const scan[4]={0X0E,0X0D,0X0B,0X07}; uchar i=0; unsigned char T0_count; /*定义定时器中断次数变量*/ unsigned char sec; /*定义1s计数变量*/ unsigned char min; typedef struct { char minute; char second; } time; time now; void delay(void) { unsigned int i; for (i = 1;i < 10000;i++); } void T0_int(void) interrupt 1 /*定时器T0中断，12M的晶振，定时50ms*/ { TH0 = 0x3c; /*重装载计数初值*/ TL0 = 0xb0; T0_count++; /*中断次数累加*/ if (T0_count==20) /*共进了20次定时中断，实现阶1S定时*/ { T0_count = 0; /*中断次数累加*/ now.second++; /*50ms计数变量累加*/ if (now.second==60) { now.second=0; now.minute++; if(now.minute==60) { now.minute=0; } } } switch(i) { case 0 : P1=table[now.minute%10]; delay(); break; case 1 : P1=table[now.minute/10]; delay(); break; case 2 : P1=table[now.second%10]; delay(); break; case 3 : P1=table[now.second/10]; delay(); break; } P0=scan[i]; i++; if(i==4) i=0; } void main(void) /*主程序开始*/ { static unsigned int i; static unsigned int j; uchar sel; TMOD = 0x11; /*8位寄存器 00010001 其中T0,T1为定时方式,方式1*/ TH0 = 0x3c; /*自动重装载值*/ TL0 = 0xb0; /*计数初值*/ TR0 = 1; /*启动T0*/ IE = 0x82; /*1000 0010: 开总中断、T0*/ IP = 0x00; /*默认优先级*/ P1 = 0xff; /*上电后P1口全部为高电平*/ T0_count = 0; P0 =0xff; loop: sel=0x11; P0=sel; sel=sel<<1; goto loop; }