{
TMOD = 0x 0 1；
TH0 =(65536-2)/256； ? //Calculate initial value, timer overflow interrupt, period 2 us
TL0=(65536-2)%256:
EA = 1；
ET0 = 1；
TR0 = 1；
while( 1)
{
if(num==a)？ //a is a multiple of 2us, for example, when 1ms, A is 500, as the case may be; ?
{
num = = 0；
XXXXXXXX？ //Insert action, such as LED1=-LED1;
}
}
}
Invalid? T0_time()？ Interrupt? 1
{
TH0 =(65536-2)/256； ? //Reload the initial value;
TL0 =(65536-2)% 256；
num++；
}
//generally do not use 2us. TH0 and TL0 are generally 50ms, and 1s is num = = 20.
//50ms，TH0 =(65536-50000)/256； TL0 =(65536-50000)% 256；