求大神讲解一下这个单片机火灾报警器的仿真图原理！附件源程序 -

#include<REG51.H>
#define uint unsigned int
#define uchar unsigned char
uchar code a[10]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f}; //段码组合,共阴极
uchar code b[6]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf}; //位码组合低有效
uchar code c[9]={201,202,203,204,205,206,207,208,0};
uchar y[8]={0,0,0,0,0,0,0,0};
//*************************************************************************************
sbit ST=P3^1;
sbit OE=P3^0;
sbit Add=P3^4;
sbit Bdd=P3^5;
sbit Cdd=P3^6;
uint t=0,h=0x9f;
uchar p[8];
uchar k,m,n,q,g,r,d,i,cnt=0,v=0;
void delay(uchar s);
void inrupt(void)
{
TMOD=0x01;
TH0=0x3c;
TL0=0xb0;
EX0=1;
IT0=1;
EX1=1;
IT1=1;
EA=1;
}
void lxy(void)
{
switch(d)
{
case 0:Add=0,Bdd=0,Cdd=0;ST=0,ST=1,ST=0;break;
case 1:Add=1,Bdd=0,Cdd=0;ST=0,ST=1,ST=0;break;
case 2:Add=0,Bdd=1,Cdd=0;ST=0,ST=1,ST=0;break;
case 3:Add=1,Bdd=1,Cdd=0;ST=0,ST=1,ST=0;break;
case 4:Add=0,Bdd=0,Cdd=1;ST=0,ST=1,ST=0;break;
case 5:Add=1,Bdd=0,Cdd=1;ST=0,ST=1,ST=0;break;
case 6:Add=0,Bdd=1,Cdd=1;ST=0,ST=1,ST=0;break;
case 7:Add=1,Bdd=1,Cdd=1;ST=0,ST=1,ST=0;break;
}
}
void time0(void) interrupt 2
{
OE=1;
t=P1;
OE=0;
if(t>=h)
{
y[d]=t;
p[i]=d;
i++;
}
d++;
lxy();
r--;
}
void time1(void) interrupt 1
{
TH0=0x3c;
TL0=0xb0;
cnt++;
if(cnt>=20)
{
v--;
cnt=0;
if(v==0)
{
g=1;
ET0=0;
TR0=0;
}
else g=0;
}
}
void time2(void) interrupt 0
{
g=1;
i++;
if(p[i]==8)
{ i=0;
g=1;
}
delay(20);
}
void delay(uchar s) //延时0.1*n毫秒 0
{
uchar j;
do
{
for(j=0;j<23;j++)
;;;
} while(s--);
}
void display(void)
{ for(;;)
{
P2=b[0],P0=a[k];
delay(20);
P2=b[1],P0=a[m];
delay(20);
P2=b[2],P0=a[n];
delay(20);
P2=b[3],P0=a[q];
delay(20);
P2=b[4],P0=a[v/10];
delay(20);
P2=b[5],P0=a[v%10];
delay(20);
if(g==1)
{
break;
}
}
}
void main(void)
{
inrupt();
for(;;)
{
P2=0x3e,P0=a[0];
delay(20);
P2=0x3d,P0=a[0];
delay(20);
P2=0x3b,P0=a[0];
delay(20);
P2=0x37,P0=a[0];
for(i=0;i<8;i++)
{
p[i]=8;
}
i=0;
t=0;
d=0;
r=8;
Add=0,Bdd=0,Cdd=0;
ST=0;
ST=1;
ST=0;
while(r);
i=0;
if(y[p[i]]>=h)
{
v=20;
ET0=1;
TR0=1;
while(v)
{switch(p[i])
{
case 0: k=c[p[i]]/1000;m=(c[p[i]]%1000)/100;n=(c[p[i]]%100)/10;q=c[p[i]]%10;display();break;
case 1: k=c[p[i]]/1000;m=(c[p[i]]%1000)/100;n=(c[p[i]]%100)/10;q=c[p[i]]%10;display();break;
case 2: k=c[p[i]]/1000;m=(c[p[i]]%1000)/100;n=(c[p[i]]%100)/10;q=c[p[i]]%10;display();break;
case 3: k=c[p[i]]/1000;m=(c[p[i]]%1000)/100;n=(c[p[i]]%100)/10;q=c[p[i]]%10;display();break;
case 4: k=c[p[i]]/1000;m=(c[p[i]]%1000)/100;n=(c[p[i]]%100)/10;q=c[p[i]]%10;display();break;
case 5: k=c[p[i]]/1000;m=(c[p[i]]%1000)/100;n=(c[p[i]]%100)/10;q=c[p[i]]%10;display();break;
case 6: k=c[p[i]]/1000;m=(c[p[i]]%1000)/100;n=(c[p[i]]%100)/10;q=c[p[i]]%10;display();break;
case 7: k=c[p[i]]/1000;m=(c[p[i]]%1000)/100;n=(c[p[i]]%100)/10;q=c[p[i]]%10;display();break;
}
}
}
}
}

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