P1.0蜂鸣器音乐程序：定时产生频率方波

程序名称：音乐演奏器
简要说明：P1.0口输出各音调的频率方波
               
编    写： MMC
更新时间：09\05
***************************************************/
#include<AT89X52.h>
#define SPK P0_0                                   //定义方波输出口
#define LED P1_1
#define shumaguan P0                               //定义数码管段码输出
unsigned int tone1,tone2;
/*****标准音符表*****/
//用于使定时器初值变化以产生相应频率的定时
unsigned char code yinfu[]={ 
                               0xfb,0xe9,      //Do
                               0xfc,0x5c,      //Re
                               0xfc,0xc1,      //Mi
                               0xfc,0xef,      //Fa
                               0xfd,0x45,      //So
                               0xfd,0x92,      //La
                               0xfd,0xd0,      //Si
                               0xfd,0xee,      //Do#
                               0xfa,0x14,      //So低
                               0xfa,0xb9,      //La低
                               0xfb,0x4d,      //Si低       
                               0x00,0x00      //音符之间的间隔，只要间隔时间小于65ms时，
                                             //喇叭不会发出声音，用作拍子之间的短暂停顿     
};
 
/*****军港之夜音调表*****/

unsigned char code shengri_tone[]={9,3,3,1,2,3,2,3,3,10,9,1,2,1,3,5,5,3,6,5,3,
                                    3,3,2,1,2,3,2,3,11,9,10,11,10,1,11,3,3,11,10,11,10,11,3,3,11,
                                    11,10,11,10,2,10,1,11,10,9,10,9,3,5,5,3,6,5,6,5,3,5,3,1,3,3,3,5,
                                    3,5,5,3,3,2,3,2,11,10,11,10,9,3,3,5,5,3,6,5,6,5,3,5,3,1,3,                                  
                                    3,5,3,5,5,3,3,3,2,3,2,11,10,11,10,9,1 //0代表不发声，即停顿；数字即为音调
};
 
/*****军港之夜节拍表*****/
unsigned char code shengri_beat[]={24,24,24,24,12,12,48,24,48,24,24,12,12,86,24,24,24,24,24,48,24,
                                      48,12,12,24,12,12,86,48,24,24,12,12,48,24,24,24,24,24,12,12,72,24,24,24,24,
                                      24,12,12,48,24,12,12,24,24,12,12,86,24,24,24,24,24,12,12,48,12,24,12,24,12,12,12,48,
                                      24,24,24,24,24,12,12,48,24,12,12,24,24,86,24,24,24,24,24,12,12,48,12,24,12,24,24,
                                      24,72,24,24,24,12,12,24,12,12,48,24,12,12,24,24,86   //节拍，即tone表各音调的延时
};
 
/*****自动演示音调表*****/
unsigned char code yanshi_tone[]={    1,0,2,0,3,0,4,0,5,0,6,0,7,0,8,0,
                                        8,0,7,0,6,0,5,0,4,0,3,0,2,0,1,0
};
 
/*****自动演示节拍表*****/
unsigned char code yanshi_beat[]={     48,1,48,1,48,1,48,1,48,1,48,1,48,1,48,2,
                                         48,1,48,1,48,1,48,1,48,1,48,1,48,1,48,2
 
}; 
 
/*****15ms延时子程序，用于节拍*****/
void delay(void)
{
       unsigned char n=15;