1. Suitable for newbies to learn and understand the minimum system of classic microcontrollers; 2. The reset circuit used this time is power-on and key reset; 3. The most important thing is that you can use the TTL to data cable to download the program, and you don’t need to frequently plug in the microcontroller to protect the boot. pin, convenient for novices, but please note that the TXD of the data line is connected to RXD, and the RXD of the data line is connected to the TXD pin. Remember to pull up the 10k resistor when using the P0 port; 4. The resistor is placed far away from the chip pin and the crystal oscillator is placed outside because of convenience Installation of 52 chip base
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