Sir, I intend to use PB7, PB6, PB5, and PB4, to run the stepper motor. For arduino i used pins 8,9,10,11. What changes should i make to the code so that it is configured for PB7, PB6, PB5, PB4 pins. And do we need to initialise all registers (like AFSEL, AMSEL, etc), like it's done in keil.