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Is my calculation right for generating 8 kHz PWM ?

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bianchi77

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Guys,

Is my calculation right for generating 3.8 kHz PWM ?

PWM wave frequency is f= 16000000/(2*8*256) = 3.8 kHz

I want to put the output into OC1A,

Is my init code right ?
Code: 
timer_init()
{
	
	//page 136 ATMEGA128A datasheet
   TCCR1A = 0xA7;  // PWM, Phase Correct, 8-bit set OC1A on compare match, clear them at top,set OC1B on compare match, clear them at top
    TCCR1B=  0x12;
}

int main(void)
{
	DDRB=0xFF;
	timer_init();
    while(1)
    {
		OCR1A = 100; //beep on

		//sound for 500ms
		_delay_ms( 500 );

		OCR1A = 0; //turn beep off

		//wait 1s between beeps
		_delay_ms( 1000 );
        //TODO:: Please write your application code 
    }
}

Thank you
 
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