【51单片机三路抢答器定时器1工作1外部中断1】2022-11-24

缘由51单片机怎么实现通过外部中断出发定时器-编程语言-CSDN问答

#include"reg52.h"
sbit s1=P3^0;
sbit s2=P3^1;
sbit s3=P3^2;
unsigned char Js=0,c=0;
unsigned char code led_mod[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x79};//共阴极数码管0-9
void EX_Init()
{
	TH1+=(65536-9216)/256;/*定时器赋初值，定时10ms触发中断，自动补偿方式*/
	TL1+=(65536-9216)%256; 
	TMOD=0X10;//16位定时器/计数器
	ET1=EA=EX1=IT1=1; //启动定时器T0开启定时器。
	TR1=0;
}
void main()
{
	unsigned char xd=0;
	EX_Init();P2=0;
	while(1)
	{
		P0 = ~led_mod[c?c:10];
		if(TR1&&c)
		{
			if(Js==100)
			{Js=0;if(--c==0)TR1=0;}
			
			if(!s1&&++xd==0)
			{TR1=0;while(!s1)P1 = ~led_mod[1];P2=15;}
			if(!s2&&++xd==0)
			{TR1=0;while(!s2)P1 = ~led_mod[2];P2=15;}
			if(!s3&&++xd==0)
			{TR1=0;while(!s3)P1 = ~led_mod[3];P2=15;}
		}
	}
}
void EX0_ISP()interrupt 2
{
	c=5;TR1=1;P2=12;Js=0;
}
void ZhongDuan() interrupt 3
{
	++Js;
	TH1+=(65536-9216)/256;
	TL1+=(65536-9216)%256;       
}