text4.c

51单片计算机中的定时器程序,在keil工程中编译

#include<reg51.h>
#include <intrins.h>
char num=0;
int tim=0,temp=0xfe; 		
sbit dula=P2^6;
sbit wela=P2^7;
char code table[]={			//之所以用code是因为编译的时候数组放在程序存储器种校?
0x3f,0x06,0x5b,0x4f,

0x66,0x6d,0x7d,0x07,

0x7f,0x6f,0x77,0x7c,

0x39,0x5e,0x79,0x71};

char code wsle[]={0xff,0xdf,0xef,0xf7,0xfb,0xfd,0xfe};  

int main()
{
	TMOD=0x01;
	TH0=(65536-50000)/256;
	TL0=(65536-50000)%256;
	EA=1;
	ET0=1;
	TR0=1;
		wela=1;
		P0=0xdf;
		wela=0;
	while(1)
	{	
		dula=1;
		P0=table[num%16];
		dula=0;
	}
	return 0;
}
void timer0() interrupt 1  using 0  //using指定所用的寄存器为r0
{
	TH0=(65536-50000)/256;
	TL0=(65536-50000)%256;
	tim++;
	if(tim==10)                //等一秒
		{
			temp=_crol_(temp,1);
		    P1=temp;
 			tim=0;
			num++;
		}
}