16位定时器pwm输出脉宽多少

65536μs。最高40MHz的16位PWM（PulseWidthModulation脉宽调制）定时器，可实现高度精确的变频控制及LED调光控制。16位定时器pwm输出脉宽是65536μs，脉宽是脉冲宽度的缩写，不同的领域，脉冲宽度有不同的含义。

#include <avr/ioh>

void main(void)

{

PORTB=0x00;

DDRB=0x0E;

// T/C1 初始化

TCCR1A=0xA1;

TCCR1B=0x09; //匹配时清零，TOP:255,频率：8M/256=3125K

OCR1A=85; //占空比：1/3

OCR1B=128; //占空比：1/2

// T/C2 初始化

TCCR2=0x69; //匹配时清零，TOP:255,频率：3125K

OCR2=170; //占空比：2/3

while (1);

}

使用M16产生三路PWM的程序，参考一下基本OK

还有个是可调节的PWM程序，我做过仿真了，需要全部留下邮箱传给你;

/

#define KEY PINC0

#define PWMA PORTB3 //17号脚

#define PWMB PORTB4 //18号脚

#include <mega8h>

#include <delayh>

#include <mathh>

unsigned int m=0;

unsigned char xiangxian=0;

bit INIT2=0; //判断是否象限2已经初始化；

bit INIT3=0;

bit INIT4=0;

/下面为四个象限中处理函数，参数为45度平分为255段角度/

inline panduan()

{

if(m<=255)

{

xiangxian=1;

}

else if((m>255)&&(m<511))

{

xiangxian=2;

if(m==256)

{

INIT2=1;

PWMA=0;

OCR1A=0x00;

OCR1B=0xff;

PWMB=1;

}

}

else if((m>=511)&&(m<767))

{

xiangxian=3;

}

else if((m>=767)&&(m<1024))

{

xiangxian=4;

}

else if(m>1024)

{

m=0;

}

}

void xiangxian1(unsigned char degree)

{

PWMA=0;

PWMB=0;

OCR1BL=m;

OCR1AL=255-m;

}

void xiangxian2(unsigned char degree)

{ unsigned char temp;

temp=m-255;

OCR1AL=temp;

OCR1BL=temp;

}

void xiangxian3(unsigned char degree)

{

unsigned char temp;

temp=m-511;

PWMA=1;

PWMB=1;

OCR1BL=255-temp;

OCR1AL=temp;

}

void xiangxian4(unsigned char degree)

{unsigned char temp=0;

temp=m-767;

PWMA=1;

PWMB=0;

OCR1BL=255-temp;

OCR1AL=255-temp;

}

/角度计算函数，负责计算在各个象限中角度对应的PWM输出/

void SET_ANGLE( unsigned char degree)

{

switch (xiangxian)

{

case 1: xiangxian1(degree);break;

case 2: xiangxian2(degree);break;

case 3: xiangxian3(degree);break;

case 4: xiangxian4(degree);break;

default:break;

}

}

void main(void)

{

unsigned char temp;

unsigned char xiangxian=0;

// Declare your local variables here

PORTB=0x187;

DDRB=0x1e;

// Port C initialization

// Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In

// State6=T State5=T State4=T State3=T State2=T State1=T State0=P

PORTC=0x01;

DDRC=0x00;

// Port D initialization

// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=Out Func1=In Func0=In

// State7=T State6=T State5=T State4=T State3=T State2=0 State1=T State0=T

PORTD=0x00;

DDRD=0x04;

// Timer/Counter 0 initialization

// Clock source: System Clock

// Clock value: Timer 0 Stopped

TCCR0=0x00;

TCNT0=0x00;

// Timer/Counter 1 initialization

// Clock source: System Clock

// Clock value: 1000000 kHz

// Mode: Fast PWM top=01FFh

// OC1A output: Inverted

// OC1B output: Inverted

// Noise Canceler: Off

// Input Capture on Falling Edge

// Timer 1 Overflow Interrupt: Off

// Input Capture Interrupt: Off

// Compare A Match Interrupt: Off

// Compare B Match Interrupt: Off

TCCR1A=0xF1;

TCCR1B=0x01;

TCNT1H=0x00;

TCNT1L=0x00;

ICR1H=0x00;

ICR1L=0x00;

OCR1AH=0x00;

OCR1AL=0x00;

OCR1BH=0x00;

OCR1BL=0x00;

// Timer/Counter 2 initialization

// Clock source: System Clock

// Clock value: Timer 2 Stopped

// Mode: Normal top=FFh

// OC2 output: Disconnected

ASSR=0x00;

TCCR2=0x00;

TCNT2=0x00;

OCR2=0x00;

// External Interrupt(s) initialization

// INT0: Off

// INT1: Off

MCUCR=0x00;

// Timer(s)/Counter(s) Interrupt(s) initialization

TIMSK=0x00;

// Analog Comparator initialization

// Analog Comparator: Off

// Analog Comparator Input Capture by Timer/Counter 1: Off

ACSR=0x80;

SFIOR=0x00;

PWMA=0;

PWMB=0;

OCR1AL=0xff;

OCR1BL=0x00;

while (1)

{

if(KEY==0)

{

delay_ms(20);

if(KEY==0)

{

m=m+1;

panduan();

SET_ANGLE(m);

PORTD2=!PORTD2;

}

}

};

}

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