【正文】 這個(gè)頻率經(jīng)過頻率發(fā)生器的倍頻或分頻后就成了電腦中各種不同的總線頻率。無源晶振只有兩個(gè)引腳，沒有所謂的正負(fù)極。 本次設(shè)計(jì)中采用了 12MHZ 的無源晶振來為單片機(jī)提供標(biāo)準(zhǔn)的時(shí)鐘頻率。它只往一個(gè)方向傳送電流的電子零件 。工作電壓低，工作電流小，發(fā)光均勻、壽命長、可發(fā)紅、黃、綠單色光。 硬 件原理圖如下所示： X T A L 218X T A L 119A L E30EA31P S E N29RS T9P 0 .0 /A D 039P 0 .1 /A D 138P 0 .2 /A D 237P 0 .3 /A D 336P 0 .4 /A D 435P 0 .5 /A D 534P 0 .6 /A D 633P 0 .7 /A D 732P 1 .0 /T 21P 1 .1 /T 2 E X2P 1 . 23P 1 . 34P 1 . 45P 1 . 56P 1 . 67P 1 . 78P 3 .0 /R X D10P 3 .1 /T X D11P 3 .2 /I NT 012P 3 .3 /I NT 113P 3 .4 /T 014P 3 .7 / R D17P 3 . 6 / W R16P 3 .5 /T 115P 2 .7 /A 1 528P 2 .0 / A 821P 2 .1 / A 922P 2 .2 /A 1 023P 2 .3 /A 1 124P 2 .4 /A 1 225P 2 .5 /A 1 326P 2 .6 /A 1 427U1AT89C52X11 2 M H zC13 0 p FC23 0 p FL S 1S O UN D E RJ P 1J UM P E RQ1NP NQ2NP N 復(fù)位電路如下圖所示： X T A L 218X T A L 119A L E30EA31P S E N29RS T9P 0 .0 /A D 039P 0 .1 /A D 138P 0 .2 /A D 237P 0 .3 /A D 336P 0 .4 /A D 435P 0 .5 /A D 534P 0 .6 /A D 633P 0 .7 /A D 732P 1 .0 /T 21P 1 .1 /T 2 E X2P 1 . 23P 1 . 34P 1 . 45P 1 . 56P 1 . 67P 1 . 78P 3 .0 /R X D10P 3 .1 /T X D11P 3 .2 /I NT 012P 3 .3 /I NT 113P 3 .4 /T 014P 3 .7 / R D17P 3 . 6 / W R16P 3 .5 /T 115P 2 .7 /A 1 528P 2 .0 / A 821P 2 .1 / A 922P 2 .2 /A 1 023P 2 .3 /A 1 124P 2 .4 /A 1 225P 2 .5 /A 1 326P 2 .6 /A 1 427U1A T 8 9 C5 2C11 0 u FR11 0 k 六、 流程圖設(shè)計(jì) 主程序流程圖 下一首歌曲流程圖 上一首歌曲流程圖 數(shù)碼管顯示流程圖 上一首歌曲號數(shù)碼管顯示流程圖 下一首歌曲號數(shù)碼管顯示流程圖 通過判斷當(dāng)前播放的歌曲號，并將其號碼送往 P2 口，驅(qū)動相應(yīng)的二極管，將號碼顯示出來。 //蜂鳴器 sbit a=P3^0。 sbit b=P3^1。 sbit e=P3^2。 //指向具體歌的指針 unsigned int data j。 //用于循環(huán) unsigned char data k。 //第幾個(gè)碼 void delay(void)。 //C 調(diào)各音符頻率與計(jì)數(shù)初值 T的對照表 //第一首 蘭花草 unsigned char code song1[46]={0x12,0x52,0x52,0x52,0x56,0x42, 0x32,0x42,0x32,0x22,0x18, 0x82,0x82,0x82,0x82,0x86,0x72, 0xB2,0x72,0x72,0x62,0x58, 0x52,0x82,0x82,0x72,0x56,0x42, 0x32,0x42,0x32,0x22,0x16,0xB2, 0xB2,0x32,0x32,0x22,0x16,0x52, 0x42,0x32,0x22,0xC2,0x88, 0xFF}。 //第三首 最浪漫的事 unsigned char code song3[138]={0xC2,0xC2,0x12, 0x34,0x32,0x32,0x32,0x12,0x12,0x52, 0x54,0x02,0xC2,0x12, 0x32,0x32,0x32,0x32,0x34,0x52,0x72, 0x7C,0x02,0x72, 0x82,0x72,0x82,0x72,0x84,0x72,0x41,0x51, 0x52,0x41,0x31,0x34,0x02,0x32,0x32,0x12, 0x34,0x32,0x12,0x32,0x54,0x42, 0x32,0x32,0x32,0x32,0x34,0x52,0x72, 0x7C,0x72,0x72, 0x82,0x72,0x82,0x72,0x84,0x82,0x72, 0x42,0x52,0x42,0x34,0x12,0x12,0x32, 0xC4,0x52,0x42,0x34,0x12,0x12, 0x31,0x41,0x32,0x3C, 0x84,0x82,0x72,0x82,0x72,0x52,0x72, 0x78,0x02,0x72,0x82,0xA2, 0x84,0x82,0x72,0x82,0x72,0x82,0x32, 0x0A,0x72,0x82,0xA2, 0x38,0x02,0x32,0x42,0x52, 0x64,0x62,0x72,0x82,0x82,0x72,0x82, 0x82,0xA2,0x82,0x82,0x82,0xA2,0x82,0x72, 0x78,0x72,0x32,0x82,0x72, 0x78,0x72,0x82,0xA3,0x51, 0x42,0x51,0x41,0x3C, 0xFF}。 //第五首 寧靜的夏天 unsigned char code song5[]={ 0X54,0XC4,0X12,0X32,0X34, 0X52,0X52,0X52,0X52,0X42,0X32,0X34, 0XC1,0XC2,0X52,0XC2,0X12,0X32,0X34, 0X11,0X12,0X31,0X12,0XC2, 0X78,0X72,0X52,0X52,0X42, 0X32,0X42,0X52,0X11,0XC1,0XC4,0XC1,0XC1,0XC1,0XC1, 0X12,0X32,0X32,0X12,0X42,0X42,0X44, 0XC2,0X12,0X32,0X42,0X52,0X72,0X72,0X82, 0X41,0X51,0X42,0X48,0X42,0X12, 0X3C,0X72,0X62, 0X3C,0X72,0X62, 0X3C,0X72,0X62, 0x21,0x31,0x41,0x51,0x61,0x71,0x81,0x91,0x61,0x71,0x81,0x91, 0X3F, 0X3F, 0X54,0XC2,0XC2,0X42,0XC2,0XC4, 0X34,0X32,0X42,0X52,0XC2,0XC4, 0XD2,0XC2,0X12,0X22,0X38, 0X12,0X22,0X32,0X42,0X48, 0xFF}。 //第七首心心相印 unsigned char code song7[85]={ 0x04,0x24,0x14,0xC4, 0x54,0x54,0x48, 0x04,0x54,0x44,0x34, 0x22,0x14,0xB2,0xC8, 0x04,0x12,0xC2,0x16,0x12, 0x76,0x52,0x46,0x12, 0x3F, 0x04,0xB4,0xD4,0xC4, 0x14,0x28,0xC4, 0x14,0x12,0x32,0x16,0xC2, 0x54,0x78,0x34, 0x4C,0x42,0x52, 0x86,0x72,0x76,0x52, 0x74,0x28,0x42,0x52, 0x46,0x12,0x26,0x12, 0xCF, 0x04,0x24,0x14,0xC4, 0x56,0x52,0x48, 0x04,0x54,0x44,0x34, 0x22,0x14,0xB2,0xC8, 0x04,0x34,0x14,0xC4, 0x12,0x32,0x18,0x42,0x42, 0x74,0x58,0x44, 0x3F, 0xFF}。 //第九首 偏偏喜歡你 unsigned char code song9[]={ 0XC2,0XB2, 0X36,0X52,0X42,0X32,0X11,0XC1,0XB2, 0XC6,0X12,0XC4,0X12,0XC2, 0X76,0XA2,0X82,0X72,0X51,0X41,0X32, 0X4C,0X42,0X32, 0X74,0X82,0X74,0X82,0X72, 0X52,0X41,0X38,0X32,0X42, 0X16,0XC2,0X72,0X52,0X42,0X42, 0X3C,0XC2,0XB2, 0X36,0X52,0X42,0X32,0X11,0XC1,0XB2, 0XC6,0X12,0XC4,0X12,0XC2, 0X76,0XA2,0X82,0X72,0X51,0X41,0X32, 0X4C,0X42,0X32, 0X76,0X82,0X74,0X82,0X72, 0X53,0X41,0X38,0X32,0X42, 0X16,0XC2,0X72,0X52,0X41,0X51,0X12, 0XCC,0XC2,0XB2, 0X16,0XC2,0X72,0X52,0X42,0X42, 0X3C,0X32,0X32, 0X26,0X22,0X24,0X42,0X32, 0x22,0x12,0x18,0x02,0x52, 0X46,0X12,0X44,0X72,0X82, 0X5C,0X52,0X52,