外部中断.c

LED显示,流水灯,定时器,可用于单片机课程设计

#include <reg51.h>
#define uchar unsigned char
sbit p33=P3^3;
uchar j,k,m;
void delay(uchar x)
{uchar y;
for(;x>0;--x)for(y=0;y<250;y++){;}}
void service_int1() interrupt 2 using 3
{
  for(k=0;k<5;k++) 
                 {P1=0x00; delay(500); P1=0xff;delay(500);}
  P1=j;p33=1; }
void main()
{uchar i; EX1=1; IT1=1; EA=1;i=0xfe; P2=0x03;P0=0xff;p33=1;
while(1)
{ P1=i; j=i; i<<=1;i++; if(i==0xff)i=0xfe;delay(200);}
}