初学单片机，为提高学习兴趣，并且对所学知识的总结与应用，也顺便做笔记，
源码（仅供参考）

#include <REGX52.h>
#include "Delay.h"sbit Buzz = P1^5;#define SPEED 400     //播放速度，值为四分音符的时长(ms)//音符与索引对应表，P：休止符，L：低音，M：中音，H：高音，下划线：升半音符号#
#define P   0
#define L1  1
#define L1_ 2
#define L2  3
#define L2_ 4
#define L3  5
#define L4  6
#define L4_ 7
#define L5  8
#define L5_ 9
#define L6  10
#define L6_ 11
#define L7  12
#define M1  13
#define M1_ 14
#define M2  15
#define M2_ 16
#define M3  17
#define M4  18
#define M4_ 19
#define M5  20
#define M5_ 21
#define M6  22
#define M6_ 23
#define M7  24
#define H1  25
#define H1_ 26
#define H2  27
#define H2_ 28
#define H3  29
#define H4  30
#define H4_ 31
#define H5  32
#define H5_ 33
#define H6  34
#define H6_ 35
#define H7  36unsigned char MusicSelect , FreqSelect;//索引与频率对照表
code unsigned int  FreqTable_H[] = {
0,
0xF8,0xF8,0xF9,0xF9,0xFA,0xFA,0xFA,0xFB,0xFB,0xFB,0xFB,0xFC,0xFC,0xFC,0xFC,0xFC,0xFD,0xFD,0xFD,0xFD,0xFD,0xFD,0xFD,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFF,};//定时器计时高位 休止符（0） 低调（1~12） 中调（13~24） 高调（25~36）code unsigned int  FreqTable_L[] = {
0,
0x8C,0xF3,0x5B,0xB8,0x15,0x67,0xB9,0x04,0x4B,0x90,0xCF,0x10,0x44,0x79,0xAC,0xDC,0x09,0x34,0x5C,0x82,0xA6,0xC8,0xE8,0x06,0x22,0x3D,0x56,0x6E,0x85,0x9A,0xAE,0xC1,0xD3,0xE4,0xF4,0x03,};//定时器计时低位 休止符（0） 低调（1~12） 中调（13~24） 高调（25~36）/*乐谱好运来*/
code unsigned char Music[] = {
M6,2+1+1,H1,2,H1,2,
M6,4+2,M6,2,
M5,2,M3,2,M5,2,H1,2,
M6,4,0,4,
M6,2,H1,2,H1,2+1,H1,1,
H1,4,M5,4,
M6,2,M5,2,M2,2,M5,2,
M3,4+2,M2,2,
M3,2,M2,2,M1,2,M3,2,
M2,4+2,M3,2,
M6,2,M5,2,M3,2,M6,2,
M6,2,M5,4+2,M6,2,H1,2,H1,2,M6,1,
H2,2,H2,2,H2,2,H1,2,
M6,4,M5,2,H1,2,
M6,4+4,
M6,4+4,                //
M6,4,H3,2+1,H2,1,
H2,4,H1,2,M6,2,
M5,2,H1,2,
M6,4,M6,4,
M6,4,H2,4,
H1,4,M6,2,M5,2,
M2,4,M5,2,M6,2,
M5,2,M3,4+2,M3,4,M6,2+1,M5,1,M6,4,M6,2,M5,2,
M6,4,H2,2+1,H1,1,
H2,4,H2,4,
H1,2+1,H1,1,H1,2,H2,2,
H3,2,H3,2,H2,2,H1,2,
M5,4,H1,2+1,M6,1,
M6,4,M6,4,
M6,4,M6,4,//
H2,4,H2,4,
H2,4,H2,4,H3,4,H3,4,
H3,4,H3,4,
M6,4,M6,4,
M6,4,M6,4,
M6,4,M6,4,
M6,4,M6,4,
0,4,M5,2,M5,2,
M6,4,M6,4,0xFF   //停止标志位
};void Timer0Init()
{TMOD |= 0x01;TL0 = 0x18;TH0 = 0xFC;TR0 = 1;ET0 = 1;EA = 1;
}void main()
{Timer0Init();while(1){if(Music[MusicSelect]!=0xFF)   //判断是否等于终止标志位{FreqSelect = Music[MusicSelect];  //获取音符对应的频率MusicSelect++;                    //MusicSelect++转换至音符长度delay(SPEED/4*Music[MusicSelect]);//选择音符对应的时间长度（时值）MusicSelect++;                   //MusicSelect++转换至下一个音符TR0 = 0;delay(5);                         //音符间短暂停顿TR0 = 1;}  else                           //如果是停止标识符清零重新播放{TR0 = 0;MusicSelect = 0;}             }}void Timer0_Routine() interrupt 1
{if(FreqSelect)   //判断是否为休止符{/*取对应频率值的重装载值到定时器*/TL0 = FreqTable_L[FreqSelect];   //设置定时器初值TH0 = FreqTable_H[FreqSelect];   //设置定时器初值Buzz = !Buzz;//翻转蜂鸣器IO口}
}
蜂鸣器播放音乐《好运来》^_^

源码（仅供参考）

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