中断疑问

只看该作者 · 2010-9-28 15:23

这两个中断程序中，为什么一个中断子函数给定时器重赋值，另一个没有重赋值呢？
中断程序一
#include <AT89X51.H>
unsigned char code dispcode[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,
0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x00};
unsigned char second;
unsigned char tcount;
void main(void)
{
TMOD=0x01;
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
TR0=1;
tcount=0;
second=0;
P0=dispcode[second/10];
P2=dispcode[second%10];
while(1)
{
  if(TF0==1)
  {
tcount++;
if(tcount==20)
{
tcount=0;
second++;
if(second==60)
{
   second=0;
}
P0=dispcode[second/10];
P2=dispcode[second%10];
}
TF0=0;
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
  }
}
}
中断程序二
#include <AT89X51.H>
unsigned char code dispcode[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x00};
unsigned char second;
unsigned char tcount;
void main(void)
{
TMOD=0x01;
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
TR0=1;
ET0=1;
EA=1;
tcount=0;
second=0;
P0=dispcode[second/10];
P2=dispcode[second%10];
while(1);
}
void t0(void) interrupt 1 using 0
{
   tcount++;
   if(tcount==20)
   {
      tcount=0;
      second++;
      if(second==60)
      {
            second=0;
         }
      P0=dispcode[second/10];
      P2=dispcode[second%10];
   }
   TH0=(65536-50000)/256;
   TL0=(65536-50000)%256;
}

只看该作者 · 2010-9-28 15:26

对不起，搞错了，应该是
#include <AT89X51.H>
unsigned char tcount2s;
unsigned char tcount02s;
unsigned char ID;
void main(void)
{
TMOD=0x01;
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
TR0=1;
ET0=1;
EA=1;
while(1);
}

void t0(void) interrupt 1 using 0
{
tcount2s++;
if(tcount2s==40)
{
tcount2s=0;
ID++;
if(ID==4)
{
ID=0;
}
}
tcount02s++;
if(tcount02s==4)
{
tcount02s=0;
switch(ID)
{
case 0:
P1_0=~P1_0;
break;
case 1:
P1_1=~P1_1;
break;
case 2:
P1_2=~P1_2;
break;
case 3:
P1_3=~P1_3;
break;
}
}
}

只看该作者 · 2010-9-28 15:58

如果你是2s中断一次的话,进入中断服务程序之后就要重新赋值啦.可能是漏了

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