89C51 microcontroller external structure diagram

Crystal oscillator

Single chip microcomputer STM32L151CCU6

Quartz Oscillator 3225 20M OSC

To get a chip, if you want to use it, you must first know how to connect. We use a chip called 89C51. Let's take a look at how to connect it.
1. Power: This is of course essential. The single-chip microcomputer uses a 5V power supply, in which the positive pole is connected to 40 pins, and the negative pole (ground) is connected to 20 pins.
2, vibrating circuit: MCU is a kind of sequential circuit, must provide pulse signal to work properly, the oscillator has been integrated inside the MCU, using crystal oscillator, connected to 18, 19 feet. Just buy the crystal oscillator, the capacitor, and connect it, just connect it as shown in Figure 1.
3. Reset pin: Connect according to the drawing in Figure 1. As to what is the meaning of reset and why it needs to be reset, it is introduced in the function of MCU.
4. EA pin: The EA pin is connected to the positive power terminal. At this point, a single-chip microcomputer is connected, and the microcontroller is started to work.