單片機源程序如下:
#include <AT89X51.H>
unsigned char t5hz;
unsigned char t7hz;
unsigned int tcnt;
bit stop;
bit flag;
void main(void)
{
unsigned char i,j;
TMOD=0x02;
TH0=0x06;
TL0=0x06;
ET0=1;
EA=1;
while(1)
{
if(P3_3==0)
{
for(i=10;i>0;i--)
for(j=248;j>0;j--);
if(P3_3==0)
{
t5hz=0;
t7hz=0;
tcnt=0;
flag=0;
stop=0;
TR0=1;
while(stop==0);
}
}
}//...while(1)
}//...main
void t0(void) interrupt 1 using 0
{
tcnt++;
if(tcnt==2000)
{
tcnt=0;
if(flag==0)
{
flag=~flag;
}
else
{
stop=1;
TR0=0;
}
}
if(flag==0)
{
t7hz++;
if(t7hz==3)
{
t7hz=0;
P3_2=~P3_2;
}
}
else
{
t5hz++;
if(t5hz==4)
{
t5hz=0;
P3_2=~P3_2;
}
}
} |
