【導(dǎo)讀】[2][M].北京：北京航空航天大學(xué)出版社，[6]林凌，李剛，丁茹，李小霞.新型單片機(jī)接口器件與技術(shù)[M].西安：西安電子科技大學(xué)出版社，2005. 隨著科技的不斷發(fā)展，目前市場(chǎng)上出現(xiàn)了許許多多的音樂播放器，人們對(duì)播放器的需求也越來越廣泛，對(duì)其要求也越來越高。用AT89S51單電機(jī)及少數(shù)外圍電路控制音樂播放,產(chǎn)生幾首不同的歌曲。根據(jù)音樂播放器的功能設(shè)計(jì)系統(tǒng)的硬件電路，包括單片機(jī)最小系統(tǒng)的設(shè)計(jì)；電源電路的設(shè)計(jì)；定時(shí)中斷電路的設(shè)計(jì)；定時(shí)器優(yōu)先級(jí)判別；揚(yáng)聲器控制電路的設(shè)計(jì)；鍵盤輸入以及LED顯示電路的設(shè)計(jì)。3．選定系統(tǒng)相關(guān)的元器件，并對(duì)之進(jìn)行了解與熟悉掌握；6．完成測(cè)試及處理和測(cè)試結(jié)果分析。明確設(shè)計(jì)任務(wù)，填寫開題報(bào)告，擬定初步方案；

　　

【正文】 OV 53H, LOW TABLE30 LCALL music RETMUSIC4: 。第四首《老鼠愛大米》 MOV P2, 10011001B 。顯示4 MOV R5, 10011001B MOV 52H, HIGH TABLE40 MOV 53H, LOW TABLE40 LCALL music RET music: MOV R3,00H 。音樂解碼器NEXT20: MOV A, R3 MOV DPH, 52H MOV DPL, 53H MOVC A, @A+DPTR MOV R2, A JZ STOP ANL A, 0FH MOV R1, A MOV A, R2 SWAP A ANL A, 0FH JNZ SING CLR TR0 JMP W11。SING: DEC A MOV 22H, A RL A MOV DPTR, TABLE00 MOVC A, @A+DPTR MOV TH0, A MOV 21H, A MOV A, 22H RL A INC A MOVC A, @A+DPTR MOV TL0, A MOV 20H, A SETB TR0 SETB TR1W11: LCALL DELAY3 INC R3 LJMP NEXT20。STOP: CLR TR0 CLR TR1 RET。***************************************************。定時(shí)器0中斷子程序。***************************************************INT_T0: CLR TR0 MOV TL0, 20H MOV TH0, 21H CPL SETB TR0 RETI。***************************************************。定時(shí)器1中斷子程序。***************************************************INT_T1: CLR TR1 CLR TR0 LCALL KEY_E MOV TH1, 3CH MOV TL1, 0BH DJNZ 60H, OUT MOV 60H, 20OUT: SETB TR1 RETI KEY_E: JB , L2 。中斷鍵盤檢測(cè) LCALL DELAY2 。消除抖動(dòng) JB , L2 。如果是高電平就跳到L2 JNB , $ 。如果仍然是低電平就執(zhí)行中斷程序 MOV P2, 10000110B 。讓LED顯示EL3: JB , $ 。檢測(cè)低電平，直到低電平時(shí)才跳出該指令 LCALL DELAY2 JB , L3 JNB , $ 。如果再來一個(gè)高電平才跳出中斷 MOV P2,R5L2: SETB TR0 RETGETKEY: 。讀A B C D鍵盤子程序 SA: JB , SB 。讀A LCALL DELAY2 JB , SA JNB , $ MOV P2, 10001000B 。顯示A MOV R5, 10001000B MOV A, 0FFH MOV B, 0AH RETSB: JB , C11 。讀B LCALL DELAY2 JB , SB JNB , $ MOV P2, 10000011B 。顯示B MOV R5, 10000011B MOV A, 0FFH MOV B, 0BH RETC11:JB , ED1 。讀C LCALL DELAY2 JB , C11 JNB , $ MOV P2, 11000110B 。顯示C MOV R5, 11000110B MOV A, 0FFH MOV B, 0CH RETED1: JB , L0 。讀D LCALL DELAY2 JB , ED1 JNB , $ MOV P2, 10100001B 。顯示D MOV R5, 10100001B MOV A, 0FFH MOV B, 0DHL0: RETGETWORD: 。讀音樂序號(hào)子程序S1: JB , S2 。讀1鍵 LCALL DELAY2 JB , S1 JNB , $ MOV P2, 11111001B 。顯示1 MOV R5, 11111001B MOV A, 0FFH MOV B, 00H RETS2: JB , S3 。讀2鍵 LCALL DELAY2 JB , S2 JNB , $ MOV P2, 10100100B 。顯示2 MOV R5, 10100100B MOV A, 0FFH MOV B, 01H RETS3: JB ,S4 。讀3鍵 LCALL DELAY2 JB ,S3 JNB ,$ MOV P2,10110000B 。顯示3 MOV R5,10110000B MOV A,0FFH MOV B,02H RETS4: JB , L1 。讀4鍵 LCALL DELAY2 JB , S1 JNB , $ MOV P2, 10011001B 。顯示4 MOV R5, 10011001B MOV A, 0FFH MOV B, 03HL1: RETDELAY: 。延時(shí)子程序 PUSH 0 。保存現(xiàn)場(chǎng) PUSH 1 MOV 0, 0HDELAY1: MOV 1, 0H DJNZ 1, $ DJNZ 0, DELAY1 POP 1 。恢復(fù)現(xiàn)場(chǎng) POP 0 RETDELAY2: MOV 41H, 100 。延時(shí)子程序2F1: MOV 42H, 250 DJNZ 42H, $ DJNZ 41H, F1 RETDELAY3: 。延時(shí)子程序3 MOV R7, 2W22: MOV R4, 125W33: MOV R0, 248 DJNZ R0, $ DJNZ R4, W33 DJNZ R7, W22 DJNZ R1, DELAY3 RETTABLE00: 。頻率表 DW 64260,64400,64524,64580 。簡碼值 低音5, 低音6, 低音7,1 DW 64684,64777,64820,64898 。 簡碼值 2,3,4,5 DW 64968,65030,65058,65110 。 簡碼值 6,7,高音1,高音 DW 65157,65178,65217 。簡碼值 高音3,高音4,高音5。第一首《真的愛你》TABLE10: DW 3020h, 2320h, 1f20hDW 1c30h, 1c10h, 1f10h, 2310h, 1f10h, 1f15h,1f15h, 1f10h, 1c10h DW 1f20h, 2320h, 2510h, 2310h, 2520h, 2a16h, 2A15H, 2310h, 1f10hDW 1c30h, 1c10h, 1f10h, 2310h, 1f10h, 1f30h, 1f10h,2310h, 2510h, 2310hDW 2310h, 2310h, 3010h, 2310h, 1710h, 2510h, 2310h, 1720h, 3020h, 2320h, 1f20hDW 1c30h, 1c10h, 1f10h, 2310h, 1f10h, 1f15h, 1f15h, 1f10h, 1c10hDW 1f20h, 2320h, 2510h, 2310h, 2520h, 2a15h, 2a15h, 2310h, 1f10hDW 1c30h, 1c10h, 1f10h, 2310h, 1f10h, 1f30h, 1f10h, 2310h, 2510h, 2310hDW 2330h, 3920h, 4020h, 4720h, 5f20h, 4720h, 4020hDW 3920h, 3910h, 3910h, 3910h, 4010h, 4720h, 4030h, 4010h, 3910hDW 4010h, 4710h, 4710h, 4710h, 4b20h, 4720h, 5530h, 4710h, 4010hDW 3910h, 3910h, 3910h, 3910h, 3910h, 4010h, 4720h, 4010h, 4010h,4010h, 4010h,4720h, 4b20hDW 4740h, 5f20h, 4720h, 4020hDW 3920h, 3910h, 3910h, 3910h, 4010h, 4720h, 4030h, 4710H, 3910hDW 4010h, 4710h, 4710h, 4710h, 4b20h, 4720h, 5530h, 4710h, 4010hDW 3910h, 3910h, 3910h, 3910h, 3910h, 4010h, 4720h, 4010h, 4010h, 4010h, 4010h,4720h,4b20hDW 4780H, 3920h, 4020hDW 4710h, 4710h, 4710h, 4710h, 4720h, 4020h, 4030h, 3920h, 4020hDW 4710h, 4710h, 4710h, 4710h, 3920h, 3620h, 4060hDW 4030h, 3910h, 3620hDW 3010h, 3010h, 3010h, 3010h, 3010h, 3610h, 3910h, 3610h, 3030h, 3010h, 3010hDW 2a20h, 3920h, 3910h, 4010h, 4710h, 4010h, 3930h, 3910h, 4010hDW 4715h, 4715h, 4720h, 4030h, 3910h, 4010h, 4710h, 4b10hDW 4760h, 3910h, 3610h, 3610hDW 3020h, 3010h, 3010h, 3010h, 3610h, 3910h, 3610h, 5f30h, 3010h, 3010hDW 2a20h, 3920h, 3910h, 4010h, 4710h, 4010h, 3930h, 3910h, 4010hDW 4715h, 4715h, 4720h, 4030h, 3910h, 4010h, 4710h, 4b10h,4760hDW 0000h。第二首《祝你平安》TABLE20: DB 26h,20h,20h,20h,20h,20h,26h,10h,20h,10h,20h,80h,26h,20h,30h,20hDB 30h,20h,39h,10h,30h,10h,30h,80h,26h,20h,20h,20h,20h,20h,1ch,20hDB 20h,80h,2bh,20h,26h,20h,20h,20h,2bh,10h,26h,10h,2bh,80h,26h,20hDB 30h,20h,30h,20h,39h,10h,26h,10h,26h,60h,40h,10h,39h,10h,26h,20hDB 30h,20h,30h,20h,39h,10h,26h,10h,26h,80h,26h,20h,2bh,10h,2bh,10hDB 2bh,20h,30h,10h,39h,10h,26h,10h,2bh,10h,2bh,20h,2bh,40h,40h,20hDB 20h,10h,20