标题:
51单片机中断和查询工作模式的区别
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作者:
liuqq
时间:
2015-5-20 18:17
标题:
51单片机中断和查询工作模式的区别
中断是硬件自动的清零,查询如果是查询的TFX就必须软件清零,如果查询的是THX和TLX就也是硬件自动的清零。验证的程序如:
#include <reg51.h>
#define uint unsigned int
#define uchar unsigned char
uchar count ;
sbit LED=P3^0;
void main()
{
TMOD = 0X01;
TH0 = (65536 - 50000)/256;
TL0 = (65536 - 50000)%256;
ET0 =1;
TR0 = 1;
while(1)
{
while(TF0 == 1)
{
if(count++ == 50)
{
LED =!LED;
}
TH0 = (65536 - 50000)/256;
TL0 = (65536 - 50000)%256;
TF0 = 0;
} //查询工作的模式 软件清零
}
}
#include <reg51.h>
#define uint unsigned int
#define uchar unsigned char
uint count=0;
void main()
{
TMOD = 0X01;
TH0 = (65536-50000)/256;
TL0 =(65536-50000)%256;
ET0 = 1;
TR0 = 1;
while(1)
{
if((TH0 == 65535/256)&&(TL0 == 65535%256)) {
count++;
if(count == 50)
{
P3 = ~P3;
count = 0;
}
TH0 =(65536-50000)/256;
TL0 =(65536-50000)%256;
}
}
}
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