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求助！下面switch语句中，能执行ConfigPWM（）语句，点亮了LED0和LED1，但不能进入中断点亮LED2。为什么？

#include <reg52.h>
#include <intrins.h>
unsigned char tmp;
sbit led0=P0^0;                           //指示灯0	 
sbit led1=P0^1;	                          //指示灯1	 
sbit led2=P0^2;                           //指示灯2	 
unsigned long PeriodCnt = 0; //PWM 周期计数值  
unsigned char HighRH = 0; //高电平重载值的高字节  
unsigned char HighRL = 0; //高电平重载值的低字节  
unsigned char LowRH = 0; //低电平重载值的高字节  
unsigned char LowRL = 0; //低电平重载值的低字节  
unsigned char T1RH = 0; //T1 重载值的高字节  
unsigned char T1RL = 0; //T1 重载值的低字节   

void ConfigPWM(unsigned int fr, unsigned char dc);  
void init();   //串口初始化
void main()
{	 	                 

           init();
          while(1)
          {         
                  if(RI==1)                     //是否有数据到来
                  {
                   RI = 0;
                  tmp = SBUF;                   //暂存接收到的数据
                switch(tmp){
case'1':	//前进
 EA=1;                                          
ConfigPWM(100, 10); 
while(1);
break;
default:	 //停止
   led0=1; 
                led1=1;                               
                led2=1;
             break;
                                       }      
          }
}
void init()        //串口初始化
{
                   ES=0;                                                                       //关中断
                     SCON = 0x50;                       位，1位停止位，无奇偶校验），波特率可变
                     TMOD = 0x20;                        
          TH1=TL1=0xFD;                              
          PCON &= 0x7f;                    
          TR1 = 1;                                                                
                     TI=0;                                                                      
                     RI=0;                    
                
               ES=1;
}

 /* 配置并启动 PWM，fr-频率，dc-占空比 */  
void ConfigPWM(unsigned int fr, unsigned char dc){  
    unsigned int high, low;  
    unsigned long tmp;      
    tmp = (11059200/12) / fr; //计算一个周期所需的计数值  
    high = (tmp*dc) / 100; //计算高电平所需的计数值  
    low = tmp - high; //计算低电平所需的计数值  
    high = 65536 - high + 12; //计算高电平的重载值并补偿中断延时  
    low = 65536 - low + 12;//计算低电平的重载值并补偿中断延时  
     
    HighRH = (unsigned char)(high>>8); //高电平重载值拆分为高低字节  
    HighRL = (unsigned char)high;  
    LowRH = (unsigned char)(low>>8); //低电平重载值拆分为高低字节  
    LowRL = (unsigned char)low;  
     
    TMOD &= 0xF0; //清零 T0 的控制位  
    TMOD |= 0x01; //配置 T0 为模式 1  
    TH0 = HighRH; //加载 T0 重载值  
    TL0 = HighRL;  
    ET0 = 1; //使能 T0 中断  
    TR0 = 1; //启动 T0  
    led0 = 0; 
led1=0; 
}  

/* T0 中断服务函数，产生 PWM 输出 */
void InterruptTimer0() interrupt 1{  

led2=0; 
    }