求解

void tim(void) interrupt 1 using 1
{
static unsigned char count;
TH0=(65536-100)/256;
TL0=(65536-100)%256;
if(count == pwm)
{ LED=1;
}
count++;
if(count==CYCLE)
{
count=0;
if(pwm!=0) LED=0;
}
变量count是不是函数结束就释放了？