基于单片机数码管计分器系统设计-毕业设计资料

1482下载地址 https://docs.qq.com/doc/DWEpnR2pOWU91b3p4?pub=1&dver=2.1.0

 

#include<reg51.h>
#define uchar unsigned char
#define uint unsigned int

sbit Score_Select=P2^6;
sbit Time_Select=P2^7;
uchar table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,
0x7d,0x07,0x7f,0x6f,0x80,0x40,0x00,0x76};//0-9数字，后面为". - 熄灯 H"
uchar msec;
unsigned char key_down=0;//键按下和松开状态指示，防止重复读取键值

/*****50msec定时器0中断*****/
void T0_int() interrupt 1
{
	TH0=0x3c; 	//50ms定时
	TL0=0xB0;

	msec++;
}
/*****延时子程序*****/
void delay(uint t)
{
	for(;t>0;t--);
}

/*--------------------------------------------------------*/
/*4*4矩阵键盘键值扫描程序                                 */
/*返回按键的数字值                                        */
/*--------------------------------------------------------*/
uchar key_scan(void)
{
	uchar key,key_val;
	P1=0xf0;//低位行线送低电平
	key=P1;//读取高位列线电平
	if(key!=0xf0)//是否有键按下
	{
		if(key_down==0)//之前没有按键按下
		{	
			key_down=1;//置按键按下标志