Phase Correct PWM library?

[jim_beam]

First, let me say thank you very much for your Code and Help!

#include <TimerHelpers.h>
// Timer 0
// output    OC0A   pin 12  (D6)
// output    OC0B   pin 11  (D5)

const byte timer0OutputA = 6;
const byte timer0OutputB = 5;
  
void setup() {
   pinMode (timer0OutputA, OUTPUT); 
   pinMode (timer0OutputB, OUTPUT); 
   TIMSK0 = 0;  // no interrupts
   Timer0::setMode (5, Timer0::PRESCALE_1, Timer0::CLEAR_A_ON_COMPARE | Timer0::CLEAR_B_ON_COMPARE);
   OCR0A = 200;    // number of counts for a cycle
   OCR0B = 150;    // duty cycle within OCR0A
}  // end of setup

void loop() {}

What do I need to change to use this Code (PWM Phase correct) on at ATiny85? Are the registers the same?

The 40 KHz is because of the frequency counter being 200, so with a clock period of 62.5 nS the frequency will be:

1 / (62.5e-9 * 200) / 2 = 40000

Just reduce the counter to get a higher frequency. eg. 75 would give approx 106 KHz. You divide by 2 because that is the way phase-correct works. It counts up and then counts down again.

The only drawback here is that since the "top" is 75, you only have 75 units of duty cycle. In other words, the duty cycle can be 1/75, 2/75 and so on. That is, increments of 1.33% each time.

So if I would only count up to 50 (having a DutyCycle resolution of 2%) it would run at 160kHz (at 16MHz main clock)?

Is it right, that the ATiny85 can run with more... up to 64MHz? Thus the PWM Frequency in phasecorrect Mode would go up to 640kHz at 50 Steps or 320kHz at 100 Steps?

Thank you ver much again!!
Cheers Jim