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標題: 快速PWM模式 [打印本頁]
作者: liuqq    時間: 2015-5-21 23:50
標題: 快速PWM模式




  3. #include <iom128v.h>

  5. void main(void)

  7. {

  9. // Port B initialization, PB.5-PB.7輸出PWM

  11. // Func7=Out Func6=Out Func5=Out Func4=Out Func3=Out Func2=Out Func1=Out Func0=Out

  13. PORTB=0xFF;

  15. DDRB=0xFF;

  17. // Timer/Counter 1 initialization

  19. // Clock source: System Clock

  21. // Clock value: Timer 1 Stopped

  23. // Mode: 相位修正PWM, top=ICR1, PWM頻率50Hz，外部晶振16M

  25. // OC1A output: Non-Inv.

  27. // OC1B output: Non-Inv.

  29. // OC1C output: Non-Inv.

  31. // Noise Canceler: Off

  33. // Input Capture on Falling Edge

  35. // Timer 1 Overflow Interrupt: OFF

  37. // Input Capture Interrupt: Off

  39. // Compare A Match Interrupt: OFF

  41. // Compare B Match Interrupt: OFF

  43. // Compare C Match Interrupt: OFF

  45. TCCR1A=0xAA;    //普通PWM

  47. TCCR1B=0x10;

  49. //TOP1=FOSC/FPWM/2/64;       //64分頻

  51. //ICR1H=TOP1>>8; ICR1L=TOP1&0xFF;

  53. ICR1H=0x09; ICR1L=0xf6;     //TOP,64分頻 49Hz PWM, TOP=2550

  55. OCR1AH=0x09;OCR1AL=0xC4;    //100%

  57. OCR1BH=0x04;OCR1BL=0xE2;    //50%

  59. OCR1CH=0x00;OCR1CL=0xFA;   //10%

  61. TCCR1B|=0x03;   //啟動T1，64分頻

  63. while(1);

  65. }
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