... when you draw the circuit diagram, the name of each pin is not marked on it, because the pins of each model chip are fixed, it is inevitable that some lines will cross when you draw the circuit diagram, which is inevitable. Even if you change the pin to look better, it doesn't really make sense. If you draw the circuit diagram of multisim simulation, you will make mistakes after changing pins. If it's protel, it's okay just to look at it yourself, but there will be mistakes when making pcb boards.