C51 1秒定时器

#include <reg52.h>

sbit LED = P1^1;

unsigned char count;

void main()
{
    TMOD = 0x01; //工作方式1  ,T/C 0 是一个16位定时器 / 计数器
    TH0 = 0x3c;
    TL0 = 0xb0;
    EA = 1;
    ET0 = 1; 
    TR0 = 1;

    LED = 0;

    while(1)
    {
    }
}

void T1_timer() interrupt 1
{
    TH0 = 0x3c;
    TL0 = 0xb0;
    count++;
    if(count == 4)
        LED = 0;
    else if(count == 20)
    {
        LED = 1;
        count = 0;
    }
}