#include

sbit LED = P0^0;

sbit ADDR0 = P1^0;

sbit ADDR1 = P1^1;

sbit ADDR2 = P1^2;

sbit ADDR3 = P1^3;

sbit ENLED = P1^4;

void main()

{

unsigned int cnt = 0;

ADDR0 = 0;

ADDR1 = 1;

ADDR2 = 1;

ADDR3 = 1;

ENLED = 0;

TMOD = 0x01;

TH0 = 0xB8; //在這裡設定了初值

TL0 = 0x00;

TR0 = 1; //啟動T0

while(1) //一直迴圈

{

if(TF0 == 1) //如果TF0=1，TH0 = 0x00，TL0 = 0x00;

{

TF0 = 0; //清除這個標誌

TH0 = 0xB8; //再次設定了初值，就這麼迴圈的

TL0 = 0x00;

cnt++;

if(cnt >= 50)

{

cnt = 0;

LED = ~LED;

}

}

}

}