仿真原理图如下（proteus仿真工程文件可到本帖附件中下载）
#include "reg52.h"
#define led P0
typedef unsigned char u8;
typedef unsigned int u16;
sbit P20=P2^0;
sbit P21=P2^1;
sbit P22=P2^2;
sbit P23=P2^3;
sbit P27=P0^7;
sbit k1 = P3^2;
sbit k2 = P3^3;
sbit beep=P1^5;
static u8 min = 0;
static u8 sec = 0;
static u8 spot = 0;
u8 code smgz[] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x40};
void delay(u16 i)
{
while(i--);
}
void display( )
{
P23=0;
P0=smgz[spot%10];
delay(1000);
P23=1;
P22=0;
P0=smgz[sec%10]|0x80;
delay(1000);
P22=1;
P21=0;
P0=smgz[min%10];
delay(1000);
P21=1;
P20=0;
P0=smgz[min/10];
delay(1000);
P20=1;
}
void Timer0Init()
{
TMOD |= 0X01;
TH0 = 0XFC;
TL0 = 0X18;
ET0 = 1;
IT0=1;//跳变沿出发方式（下降沿）
EX0=1;//打开INT0的中断允许。
IT1=1;
EX1=1;
EA = 1;
TR0 = 1;
}
void BEEP()
{
while(1)
{
beep=~beep;
delay(10); //延时大约100us
}
}
void main()
{
Timer0Init();
while(1)
{
display( );
}
}
void Timer0() interrupt 1
{
static int Timer0_times = 0;
TH0 = 0XFC;
TL0 = 0X18;
Timer0_times++;
if(Timer0_times == 70)
{
if(spot < 9)
spot++;
else if(sec < 9)
{
sec++;
spot = 0;
}
else
{
min++;
spot = sec = 0;
if(min>=12)
{
BEEP();
}
}
Timer0_times = 0;
}
}
void Int0() interrupt 0 //外部中断0的中断函数
{
delay(1000); //延时消抖
if(k1==0)
{
TR0 = ~TR0;
}
}
void Int1() interrupt 2 //外部中断1的中断函数
{
delay(1000); //延时消抖
if(k2==0)
{
TR0 = 0;
min = sec = spot = 0;
}
}
全部资料51hei下载地址：
单片机.zip
(26.34 KB, 下载次数: 47)
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