Writing a logic 1 to a bit in the PINx register of many atmegas results in the corresponding output toggling its state.
In this case, arduino pin 13, corresponds to the atmega PORTB bit 5. So writing a 1 to PINB bit 5 toggles the pin.
Writing a logic 1 to a bit in the PINx register of many atmegas results in the corresponding output toggling its state.
In this case, arduino pin 13, corresponds to the atmega PORTB bit 5. So writing a 1 to PINB bit 5 toggles the pin.