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定時(shí)器0的方式1實(shí)現(xiàn)一個(gè)發(fā)光二極管以500ms間隔閃爍，用定時(shí)器1的方式1實(shí)現(xiàn)兩位數(shù)碼...
#include <reg51.h>
#define uchar unsigned char
sbit LED=P1^0; //連的是LED
#define MAX_NUM 99 //最大倒計(jì)時(shí)數(shù)
#define SEGPORT P0 //定義數(shù)碼管連接端口
sbit LE_DUAN = P2^6; //定義573鎖存使能端口 段鎖存
sbit LE_WEI = P2^7; //定義573鎖存使能端口 位鎖存
unsigned char code Seg_Duan[] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f}; //共陰數(shù)碼管顯示段碼值 0~9
unsigned char code Seg_Wei[] = {0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f}; //數(shù)碼管的位碼,低電平有效。
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; //定時(shí)時(shí)間 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; //數(shù)碼管十位
gewei=second%10; //數(shù)碼管個(gè)位
SEGPORT=0; //清空數(shù)據(jù)
LE_DUAN=1; //段鎖存
LE_DUAN=0;
delay(30);
SEGPORT = Seg_Wei[1]; //先送位碼值
LE_WEI = 1; //573高電平鎖存
LE_WEI = 0;
SEGPORT = Seg_Duan[shiwei]; //再送段碼值
LE_DUAN = 1; //573高電平鎖存
LE_DUAN = 0;
delay(300);
SEGPORT = Seg_Wei[0]; //先送位碼值
LE_WEI = 1; //573高電平鎖存
LE_WEI = 0;
SEGPORT = Seg_Duan[gewei]; //再送段碼值
LE_DUAN = 1; //573高電平鎖存
LE_DUAN = 0;
delay(300);
}
}
void tim0(void) interrupt 1 //定時(shí)器0中斷
{
TH0=(65536-50000)/256; //定時(shí)時(shí)間 50ms
TL0=(65536-50000)%256;
count0++;
if(count0==10) //50毫秒定時(shí)，50*10=500（毫秒)
{
count0=0;
LED=~LED; //LED取反
}
}
void tim1(void) interrupt 3 //定時(shí)器1中斷
{
TH1=(65536-50000)/256;
TL1=(65536-50000)%256;
count1++;
if(count1==20) //50毫秒定時(shí)，50*20=1000（毫秒)=1（秒）
{
count1=0;
second--;
if(second==0xff)
{
second=MAX_NUM;
}
}
}
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作業(yè).rar
2020-3-27 17:01 上傳
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31.81 KB, 下載次數(shù): 6, 下載積分: 黑幣 -5
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