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#include <reg51.h>
#define uchar unsigned char
#define uint unsigned int
sbit duoji=P0^0;
uint aa=0;
uint k; //定義一個(gè)全局變量
void delayms(uint i)
{
uchar b;
for(;i>0;i--)
for(b=110;b>0;b--);
}
void jiaodu(uchar b)
{
k=b;
}
void time0()interrupt 1
{
TH0=(65536-100)/256; //以20ms為一個(gè)周期,以0.1ms為一個(gè)脈沖寬度
TL0=(65536-100)%256;
if(aa<=k)
duoji=1;
else
duoji=0;
aa++;
if(aa>200)
aa=0;
}
void time0init()
{
TMOD=0x01;
TH0=(65536-100)/256;
TL0=(65536-100)%256;
EA=1;
TR0=1;
ET0=1;
}
void main()
{ uint i=0;
time0init();
while(1)
{
jiaodu(18);
delayms(1600);
jiaodu(1);
delayms(1600);
}
}
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