Circuit diagram of the minimum system of single chip microcomputer

This semester, we have started a new course, Microcontroller. It is a very practical course! What we are learning is the structure and programming based on 8051 produced by Atemel. In the process of contact, we have learned the minimum system of 8051. Through this minimum system, we can use Keil software to program and control some peripherals! For example, some simple experiments: flashing lights, analog switch lights, etc.! So it is very important to make a minimum system.

Here are some simple circuit diagrams I know:

1. Power circuit:

We know that the voltage required for the normal operation of the microcontroller is +5V, but we cannot get it directly, so we can only convert it. Use 7805 to convert the +9V voltage into +5V. When welding the circuit, pay attention to C1 and C2 as polarized capacitors, so pay attention to the positive and negative poles. And the +9V power supply is very convenient. Just solder an interface to the circuit and plug in the power supply directly. But considering the economic issues, I didn't buy that kind for you. When using it, cut the connector in front of the wire. There should be 4 wires in it, 2 of which are +9V and the other two are +24V. We can just use the +9V wire! The power supply circuit diagram is as follows:

2. Single chip microcomputer welding circuit:

This circuit is relatively simple, and it uses a power-on reset circuit. It also uses very few components, but special attention should be paid to the interfaces of the microcontroller, especially the I/O interfaces, because we need to use them for output or data transmission. Therefore, it is best to have more interfaces, so use double-row pins or single-row pins, and use cables to connect them to peripherals.

3. Serial port welding, which is the download line!

We compile some programs through Keil software and implement some functions through the microcontroller, but we must download the program to the microcontroller through a download cable. We can also use a burner, but the cost is too high and the utilization rate is too low, so we use a download cable! I originally planned to solder the USB interface, but it felt very difficult, so I felt that it would be better to use this serial port circuit, and the success rate is higher! This circuit mainly uses the 74373 latch. Remind everyone that any chip must be connected to power and ground, don't forget. When I connected a buzzer circuit, it took me a day to check the circuit because the 74LS175 was not grounded. So don't forget it!

Note that the circuit we soldered is only the minimum system of the microcontroller, without any external devices. So when checking this circuit, you need to connect a simple peripheral. I have the information here, you can come and get it! I wish you all a successful experience!!!