TTL输出程序
#include<reg52.h>
#define uchar unsigned cha
#define uint unsigned in
sbit LED=P1^0;
sbit DOUT=P2^0;
void delay(
{
uchar m,n,s;
for(m=20;m>0;m--)
for(n=20;n>0;n--)
for(s=248;s>0;s--);
}
void main()
{
while(1)
{
LED=1;
if(DOUT==0
{
delay()
if(DOUT==0
{
LED=0;
}
}
}
}
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