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It's a try to make PWM controller on X channel using AT MCU. MCU communication is I2C.

PCA9685 ATtiny44A

ATtiny44A: top speed: 8MHz enter/exit interrupt: 8cc + Xcc - determine enough cycles

let suppose we want to have resolution at 2 deg, then I need at least 90 interrupt per 1ms or 1 interrupt each 11us which at 8MHz clock speed (0.125us) will be 88cc

low boundary is fixed t=0 -> all PWM HGH t=low boundary -> first interrupt ... intermediate interrupts t=high boundary -> last interrupt

10cc to prepare 1 pwm channel data or 60cc for all PWMS + 10cc to track cycles + 1cc to output = 71cc min

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