AVR-Chat

What is your system clock?

Jim Wagner

On Sep 27, 2011, at 10:41 PM, Philippe Habib wrote:

> As it turned out, I need timer 0 to run PWM on a pin so I have to  
> use timer 1 for my timer tick.
>
> Using what I learned from timer 0, I was hoping it would be easy to  
> generate a 10ms tick using timer 1.
>
> Here is my setup:
>
> TCCR1A = (0 << WGM10) | (0 << WGM11); // Make sure these are low for  
> CTC
> TCCR1B |= (0 << WGM12); // CTC mode
> TCCR1B |= (1 << CS12); // Use system clock
> TCCR1B |= (1 << CS10) | (0 << CS11) | (0 << CS12); // no div, full  
> clock
> TIMSK1 = (1 << OCIE1A);	 // Set int for match on A
>
> OCR1A = 64000; // compare value
> //	OCR1AH = 0xFF; // MSB
> //	OCR1AL = 0x00;	// LSB
>
> Here is my ISR
>
> ISR(TIMER1_COMPA_vect)
> {
> PORTD ^= (1 << 6); //Toggle LED
> return;
> }
>
> Using the system clock, I am getting times in the seconds. Am I  
> doing something totally wrong with my timebase, or something else?
>
> Thank you for any light you can shed on this.
> 



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