中断优先级.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
uchar i=50,num=0,j,k;
sbit p33=P3^3;
void delay(uchar x)
{uchar y;
for(;x>0;--x)for(y=0;y<250;y++){;}}

void main()
{P2=0x03;P0=0xff; p33=1;
TMOD=0x01;  EA=1; ET0=1; TR0=1;PX1=1;EX1=1;IT1=1;
while(1) {P1=~num;j=~num;}}

void Timer0() interrupt 1 using 1
{ TH0=0xb1; TL0=0xe0; 
   if(!(i--)) {num++; i=50;}}

void service_int1() interrupt 2 using 3
{
  for(k=0;k<5;k++) 
                 {P1=0x00; delay(500); P1=0xff;delay(500);}
  P1=j;}