第一个中段程序,精确中断

#include<reg52.h>
#define uint unsigned int

uint num=0;

int main()
{
    P1=0x00;
    TMOD=0x01;//set the timer 0,to be the runing model of 0x01
    TH0=(65535-45872)/256;//assign 45872 to the crystal oscillator of 11.0592MHz to count 50ms
    TH1=(65535-45872)%256;

    EA=1;//enable the the general interrupt
    ET0=1;//enable the interrupt of timer 0
    TR0=1;//run timer 0

    while(1);

    return 0;
}

void T0_timer() interrupt 1
{
    TH0=(65535-45872)/256;//assign 45872 to the crystal oscillator of 11.0592MHz to count 50ms again
    TH1=(65535-45872)%256;

    num++;
    if(num==20)
    {
        num=0;
        P1=~P1;
    }
}