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Speaker Control & Sound Generation with HT66F50 Microcontroller in Assembly Language

Learn how to control a speaker with the HT66F50 microcontroller using PC4 pin output features for sound generation. Understand the principles of speaker sound production and frequency modulation, along with the programming and functions to generate tones in assembly language.

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Speaker Control & Sound Generation with HT66F50 Microcontroller in Assembly Language

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  1. 4-8 IO_speaker 利用HT66F50 中PC4腳位輸出特性 控制speaker 發聲

  2. 喇叭發聲原理 • 利用喇叭上的線圈通上電流造成薄膜振動 • 振動推動空氣產生聲音

  3. LA之頻率為440KHz • 每隔半音頻率增加為1.059倍 • DO RE MI FA SOL LA TI DO’ • TI=440KHz * 1.059 * 1.059 =493.9 Hz • DO’= TI=440KHz * 1.059 * 1.059 * 1.059 =523Hz

  4. 方波每一週期有HIGH LOW 各一半

  5. ;PROGRAM : 4-8.ASM ;FUNCTION: Generate Tone Do~Do PC4 I/O pin #INCLUDE HT66F50.INC ;-------------------------------------------------------------------- MY_DATA .SECTION 'DATA' ;== DATA SECTION == DEL1 DB ? PITCH DB ? COUNT1 DB ? COUNT2 DB ? ;-------------------------------------------------------------------- SPK_PORT EQU PC.4 ;define speak port SPK_PORTC EQU PCC.4 MY_CODE .SECTION AT 0 'CODE' ;== PROGRAM SECTION == ORG 00H ;HT-66F50 RESET VECTOR CLEAR SPK_PORTC ;PCC.4=0

  6. MAIN: MOVE A,TAB_PITCH_DURATION MOVE TBLP,A ;Initial table pointer NEXT_PITCH: TABRDL PITCH ;Load Pitch/Duration to Pitch/TBLH CLEAR ACC XOR A,TBLH ; TBLH, read only SZ Z ; Is last tone JMP MAIN ;yes, restart MOV COUNT1,A ;No, load Duration to Count1 INC TBLP LOOP: MOVE A,10 MOVE COUNT2,A ;inner loop count

  7. HI: SET SPK_PORT ;Set SPK_PORT High MOVE A,PITCH CALL DELAY ;Pitch delay CLR SPK_PORT ;Reset SPK_PORT Low MOVE A,PITCH CALL DELAY ;Pitch delay SDZ COUNT2 ;inner loop ok JUMP HI ;NO. SDZ CONUT1 ;Outer loop ok JMP LOOP ;No. JMP NEXT_PITCH ;yes, next pitch

  8. ACC*10us ,(ACC*9+1) cycles DELAY PROC MOV DEL1,A ;SET DEL1 COUNTER DEL_1: TABRDL ACC TABRDL ACC TABRDL ACC SDZ DEL1 ;DEL1 DOWN COUNT JMP DEL_1 RET DELAY ENDP ORG LASTPAGE

  9. 1000000/(523*2*10) DO TONE523/(2*10) DURATION TAB_PITCH_DURATION: DC 1000000/(523*2*10)+(523)/(2*10))SHL 8 ;Do tone & Duration DC 1000000/(587*2*10)+(587)/(2*10))SHL 8 ;Re tone & Duration DC 1000000/(659*2*10)+(659)/(2*10))SHL 8 ;MI tone & Duration DC 1000000/(698*2*10)+(698)/(2*10))SHL 8 ;FA tone & Duration DC 1000000/(785*2*10)+(785)/(2*10))SHL 8 ;SoL tone & Duration DC 1000000/(880*2*10)+(880)/(2*10))SHL 8 ;LA tone & Duration DC 1000000/(988*2*10)+(988)/(2*10))SHL 8 ;SoL tone & Duration DC 1000000/(1047*2*10)+(1047)/(2*10))SHL 8 ;LA tone & Duration DC 0 ;Table end code END

  10. SHL • 00111111 +20 SHL 8 00111111 (TBLP 顯示0至9) +00100000 =01011111 (after SHL Bit 14-8放置 TBLH 作為DELAY)

  11. 音調高低之參數 • F為產生之音調頻率 • 半週期時間為(2*F) -1 • Delay 時間 DEL1*10us • 產生F Hz 所需之DEL1為 (2F) -1/(10*10-6)=106/(2*F*10)

  12. 產生0.5秒之頻率F Hz所需脈波數為 F/2 • 8 bit problem • Two Loop 內圈10 外圈 F/(2*10)

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