|
定时器0的方式1实现一个发光二极管以500ms间隔闪烁,用定时器1的方式1实现两位数码...
#include <reg51.h>
#define uchar unsigned char
sbit LED=P1^0; //连的是LED
#define MAX_NUM 99 //最大倒计时数
#define SEGPORT P0 //定义数码管连接端口
sbit LE_DUAN = P2^6; //定义573锁存使能端口 段锁存
sbit LE_WEI = P2^7; //定义573锁存使能端口 位锁存
unsigned char code Seg_Duan[] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f}; //共阴数码管显示段码值 0~9
unsigned char code Seg_Wei[] = {0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f}; //数码管的位码,低电平有效。
static uchar second=MAX_NUM,count0,count1;
uchar shiwei;
uchar gewei;
void delay(unsigned int cnt)
{
while(--cnt);
}
void main()
{
TMOD=0x11;
TH0=(65536-50000)/256; //定时时间 50ms
TL0=(65536-50000)%256;
TH1=(65536-50000)/256;
TL1=(65536-50000)%256;
EA=1;
ET0=1;
TR0=1;
ET1=1;
TR1=1;
SEGPORT = 0;
LE_DUAN = 0;
LE_WEI = 0;
while(1)
{
shiwei=second/10; //数码管十位
gewei=second%10; //数码管个位
SEGPORT=0; //清空数据
LE_DUAN=1; //段锁存
LE_DUAN=0;
delay(30);
SEGPORT = Seg_Wei[1]; //先送位码值
LE_WEI = 1; //573高电平锁存
LE_WEI = 0;
SEGPORT = Seg_Duan[shiwei]; //再送段码值
LE_DUAN = 1; //573高电平锁存
LE_DUAN = 0;
delay(300);
SEGPORT = Seg_Wei[0]; //先送位码值
LE_WEI = 1; //573高电平锁存
LE_WEI = 0;
SEGPORT = Seg_Duan[gewei]; //再送段码值
LE_DUAN = 1; //573高电平锁存
LE_DUAN = 0;
delay(300);
}
}
void tim0(void) interrupt 1 //定时器0中断
{
TH0=(65536-50000)/256; //定时时间 50ms
TL0=(65536-50000)%256;
count0++;
if(count0==10) //50毫秒定时,50*10=500(毫秒)
{
count0=0;
LED=~LED; //LED取反
}
}
void tim1(void) interrupt 3 //定时器1中断
{
TH1=(65536-50000)/256;
TL1=(65536-50000)%256;
count1++;
if(count1==20) //50毫秒定时,50*20=1000(毫秒)=1(秒)
{
count1=0;
second--;
if(second==0xff)
{
second=MAX_NUM;
}
}
}
|
-
-
作业.rar
31.81 KB, 下载次数: 6, 下载积分: 黑币 -5
|