编程实现51单片机,P2口连接一个共阳极数码管,每到1s更新显示0~9s,要求采用定时器1定时

Answer 1

#include<reg52.h>
#include <intrins.h>
#define uchar unsigned char
#define uint unsigned int
uchar code TABLE[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d, 0x07,0x7f,0x6f,0x77};//七段码表

主程序中：
TMOD=0X10;
TH1=(65536-50000)/256;
TL1=(65536-50000)%256;
ET1=1;//开定时器1中断
EA=1;//开总中断
TR1=1；//启动定时器1
//中断子程序
void Timer1(void) interrupt 3
{
TH1=(65536-50000)/256;
TL1=(65536-50000)%256;
a++;
if(a==20) {a=0;sec++;}//20次是1秒
if(sec==10) {sec=0;}
P0=TABLE[sec];

}