| #include <reg52.h>
 #define uchar unsigned char
 #define uint unsigned  int
 sbit key1=P3^4;
 sbit led=P1^0;
 uint i,j=0;
 
 void main()
 {
 TMOD=0x01;*/初值自己改下,定时器T0工作在模式2方式*/
 TH0=0x38;
 TL0=0x38;
 EA=1;
 ET0=1;
 
 while(1)
 {
 if(key1==0)
 {
 
 TR0=1;
 while(!key1);
 TR0=0;
 
 j++;
 
 if(j==5)
 led=0;
 if(j==10)
 led=1;
 
 
 }
 
 }
 
 }
 
 |