【求解答】两个关于蜂鸣器音乐电路的问题： -

#include <reg52.h>
#define uchar unsigned char
#define uint  unsigned int
sbit fm=P3^4;                                     //蜂鸣器控制端口
uchar timeh,timel;                               //用于存放定时器的高8位和低8位
uchar code zbjbxf[]={                               //定义《快乐成长》的简谱数组
0xB3,0x91,0xC2,0xB6,0x83,0x61,0x92,0x86,0x62,0x61,0x61,0x62,0x82,0x81,0x81,0x82,0x92,0x82,0x42,0x56,       //歌曲第一段（与歌谱每行对应，至反复记号处）
0x62,0x02,0x42,0x64,0x82,0xB2,0xA2,0x82,0x96,0x94,0xB1,0x91,0x84,0x91,0x81,0x12,0x82,0x51,0x61,0x4A,
0x62,0x84,0x42,0x93,0x81,0x61,0x51,0x42,0x52,0x62,0x14,0x12,0x23,0x11,0x81,0x91,0x82,0x02,0x61,0x61,
0x92,0x82,0x42,0x56,0x62,0x02,0x42,0x64,0x41,0x81,0xB4,0xA2,0x83,0x91,0x82,0x53,0x41,0x51,0x61,0x26,
0x44,0x72,0x94,0x91,0x91,0x84,0x82,0x94,0x62,0x92,0x82,0x32,0x4A,0x81,0x61,0xB2,0xB1,0x91,0xC2,
0xB6,0x82,0x81,0x61,0x92,0x86,0x92,0xB2,0xB2,0xC2,0xB3,0x91,0x62,0x52,0x42,0x12,0x82,0x42,0x56,
0x62,0x02,0x42,0x64,0x82,0xB2,0xA2,0x82,0x96,0x92,0xB3,0x91,0x82,0x92,0x82,0x62,0x52,0x42,0x12,0x82,0x51,0x61,
0x4C,
0xB3,0x91,0xC2,0xB6,0x83,0x61,0x92,0x86,0x62,0x61,0x61,0x62,0x82,0x81,0x81,0x82,0x92,0x82,0x42,0x56,       //歌曲第二段（与歌谱每行对应）
0x62,0x02,0x42,0x64,0x82,0xB2,0xA2,0x82,0x96,0x94,0xB1,0x91,0x84,0x91,0x81,0x12,0x82,0x51,0x61,0x4A,
0x62,0x84,0x42,0x93,0x81,0x61,0x51,0x42,0x52,0x62,0x14,0x12,0x23,0x11,0x92,0x82,0x02,0x61,0x61,
0x92,0x82,0x42,0x56,0x62,0x02,0x42,0x64,0x41,0x81,0xB4,0xA2,0x83,0x91,0x82,0x93,0x81,0x81,0x91,0x66,
0x44,0x72,0x94,0x91,0x91,0x84,0x82,0x94,0x62,0x92,0x82,0x32,0x4A,0x81,0x61,0xB2,0xB1,0x91,0xC2,
0xB6,0x82,0x81,0x61,0x92,0x86,0x92,0xB2,0xB2,0xC2,0xB3,0x91,0x62,0x52,0x42,0x12,0x82,0x42,0x56,
0x62,0x02,0x42,0x64,0x82,0xB2,0xA2,0x82,0x96,0x92,0xB3,0x91,0x82,0x92,0x82,0x62,0x52,0x42,0x12,0x82,0x51,0x61,
0x46,0x62,0x02,0x42,0x64,0x82,0xB2,0xA2,0x82,0x9C,
0x92,0xB3,0x91,0x82,0x92,0x82,0x62,0x52,0x42,0x14,0x82,0x94,0x82,0xBC,0xff};
uchar code chuzhi[]={                         //适合12M的晶振定时器初值表，高低8位分开
      0xff,0xff,                               //占位
      0xFB,0xE9,                               //D调低音5-中音4
      0xFC,0x5B,
      0xFC,0xBD,
      0xFC,0xED,
      0xFD,0x43,
      0xFD,0x8E,
      0xFD,0xB3,
      0xFD,0xF3,                               //D调中音5-高音4
      0xFE,0x2D,
      0xFE,0x5E,
      0xFE,0x76,
      0xFE,0xA1,
      0xFE,0xD0,
      0xFE,0xD9,
      };
void timer0() interrupt 1{                      //定时器0中断服务程序
      TH0=timeh;                               //将timeh赋给计时器的高8位
      TL0=timel;                               //将timel赋给计时器的低8位

      fm=~fm;                               //定时器每次到时将蜂鸣器反相
}
void delay(uint z){                               //延时238ms,即八分音符
      uint y;
      for(z;z>0;z--)
               for(y=27406;y>0;y--);             //大致时间
}
void delay1(uint z){                               //音符间适当延时
      uint y;
      for(z;z>0;z--)
               for(y=162;y>0;y--);             //大致时间
}
void main(){
      uint temp;                               //存放简谱数组中的每一个音符的临时变量
      uchar i=0;
      uchar jp;                               //jp用于取出temp中的高8位和低8位
      TMOD=0x01;                               //设置定时器T0工作于方式1
      IE=0x82;                               //允许T0中断
      while(1){
            temp=zbjbxf;
         if(temp==0xff)
                     break;
            jp=temp/16;                      //取数的高4位，音频数值
            if(jp!=0){
                     timeh=chuzhi[jp*2];       //构造定时器初值高8位
                     timel=chuzhi[jp*2+1];       //构造定时器初值低8位
                     TR0=1;                         //开定时器
            }else{
                     TR0=0;                         //关定时器
                     fm=1;                         //关蜂鸣器
            }
            delay(temp%16);                //取数的低4位,节拍（音符总时延）
            TR0=0;                               //唱完一个音停5ms
            fm=1;
            delay1(5);
            TR0=1;
            i++;
      }
      TR0=0;                                     //关定时器
      fm=1;                                     //关蜂鸣器
}