c语言中断问题

Question

led0是中断，led1,2,3是我测试用的，中断返回不应该是回到while（1）里吗？为什么led2一直是灭的，它不应该和led3一样是闪烁的吗？#include <reg52.h>typedef unsigned char u8;typedef unsigned int u16;sbit led0 =  P1^0;sbit led1 =  P1^1;sbit led2 =  P1^2;sbit led3 =  P1^3;u8 timer;void delay(u16 num){ u16 x,y; for(x=num; x>0; x--) for(y=110; y>0; y--) { ;//??1ms }}void main (void){  TMOD = 0x01;  TH0 = (65535-50000)/256; led1 = 0; delay(300); led1 = 1;  TL0 = (65535-50000)%256;  EA = 1;  ET0 = 1;  TR0 = 1;  while(1)  {  led2 = 0; delay(100);  led2 = 1; delay(100);  }}void timer_ser(void) interrupt 1{  TH0 = (65535-50000)/256; led3 = 0; delay(100); led3 = 1; delay(100);  TL0 = (65535-50000)%256;  timer ++;  if(timer == 20)  {    timer = 0; led0 = ~led0;  }}

Answer 1

我用的是protues仿真，我又改了几下代码，感觉好像是 protues有问题？